1、NSCalendar用法
-(NSString *) getWeek:(NSDate *)d
{
NSCalendar *calendar = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit |
NSDayCalendarUnit | NSWeekCalendarUnit;
NSDateComponents *components = [calendar components:units
fromDate:d];
[calendar release];
switch ([components weekday]) {
case1:
return @"Monday"; break;
case2:
return @"Tuesday"; break;
case3:
return @"Wednesday"; break;
case4:
return @"Thursday"; break;
case5:
return @"Friday"; break;
case6:
return @"Saturday"; break;
case7:
return @"Sunday"; break;
default:
return @"NO Week"; break;
}
NSLog(@"%@",components);
}
2、將網絡數據讀取爲字符串
-(NSString *)getDataByURL:(NSString *)url {
return [[NSString alloc] initWithData:[NSData dataWithContentsOfURL: [NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]] encoding:NSUTF8StringEncoding];
}
3、讀取⺴絡圖⽚
-(UIImage *)getImageByURL:(NSString *)url {
return [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL: [NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
}
4、多線程(這種方式,只管建立線程,不管回收線程)
[NSThread detachNewThreadSelector:@selector(scheduleTask) toTarget:self withObject:nil];
-(void)scheduleTask
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[pool release];
}
如果有參數,則這麼⽤
[NSThread detachNewThreadSelector:@selector(scheduleTask:) toTarget:self withObject:[NSDate date]];
-(void)scheduleTask:(NSDate *)mdate
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[pool release]; }
在線程⾥運⾏主線程⾥的⽅法
[self performSelectorOnMainThread:@selector(moveToMain) withObject:nil waitUntilDone:FALSE];
5、⽤戶缺省值NSUserDefaults讀取:
NSUserDefaults *df = [NSUserDefaults standardUserDefaults];
NSArray *languages = [df objectForKey:@"AppleLanguages"];
NSLog(@"all language is %@",languages);
NSLog(@"index is %@",[languages objectAtIndex:0]);
NSLocale *currentLocale = [NSLocale currentLocale];
NSLog(@"language Code is %@",[currentLocale objectForKey:NSLocaleLanguageCode]);
NSLog(@"Country Code is %@",[currentLocale objectForKey:NSLocaleCountryCode]);
6、view之間轉換的動態效果設置
SecondViewController *secondViewController = [[SecondViewController alloc] init];
secondViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;//⽔水平翻轉
[self.navigationController presentModalViewController:secondViewController animated:YES];
[secondViewController release];
7、UIScrollView 滑動用法: -(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSLog(@"正在滑動中。。")
}
//⽤戶直接滑動UIScrollView,可以看到滑動條
-(void)scrollViewDidEndDelerating:(UIScrollView *)scrollView {
}
//通過其他控件觸發UIScrollView滑動,看不到滑動條
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
}
//UIScrollView 設置滑動不超出本⾝身範圍
[scrollView setBounces:NO];
8、iphone的系統目錄:
//得到Document:目錄
NSArray *paths =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//得到temp臨時目錄
NSString *temPath = NSTemporaryDirectory();
//得到目錄上的文件地址
NSString *address = [paths stringByAppendingPathComponent:@"1.rtf"];
9、狀態欄顯⽰示indicator
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
10、app Icon顯示數字:
- (void)applicationDidEnterBackground:(UIApplication *)application
{
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:5];
}
11、sqlite保存地址:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectoryNSUserDomainMask, YES);
NSString *thePath = [paths objectAtIndex:0];
NSString *filePath = [thePath stringByAppendingPathComponent:@"kilometer.sqlite"];
NSString *dbPath = [[[NSBundle mainBundle] resourcePathstringByAppendingPathComponent:@"kilometer2.sqlite"];
12、鍵盤彈出隱藏,textfield變位置
_tspasswordTF = [[UITextField alloc] initWithFrame: CGRectMake(100,
150, 260, 30)];
_tspasswordTF.backgroundColor = [UIColor redColor];
_tspasswordTF.tag = 2;
/*
Use this method to release shared resources, save user data,
_tspasswordTF.delegate = self;
[self.window addSubview: _tspasswordTF];
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[self animateTextField: textField up: YES];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[self animateTextField: textField up: NO];
[textField resignFirstResponder];
return YES;
}
- (void) animateTextField: (UITextField*) textField up: (BOOL) up {
const int movementDistance = 80;
// tweak as needed
const float movementDuration = 0.3f;
// tweak as needed
int movement = (up ? -movementDistance : movementDistance);
[UIView beginAnimations: nil context: nil]; [UIView setAnimationBeginsFromCurrentState: YES]; [UIView setAnimationDuration: movementDuration];
self.window.frame = CGRectOffset(self.window.frame, 0, movement);
[UIView commitAnimations];
}
13、獲取圖片的尺⼨
CGImageRef img = [imageView.image CGImage];
NSLog(@"%d",CGImageGetWidth(img));
NSLog(@"%d",CGImageGetHeight(img));
14、AlertView,ActionSheet的cancelButton點擊事件:
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex: (NSInteger)buttonIndex; // before animation and hiding view
{
NSLog(@"cancel alertView... buttonindex = %d",buttonIndex); //當⽤用戶按下Cancel按鈕
if (buttonIndex == [alertView cancelButtonIndex]){
exit(0);
}
}
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
NSLog(@"%s %d button = %d cancel actionSheet.....",__FUNCTION__,__LINE__, buttonIndex);
//當⽤用戶按下Cancel按鈕
if (buttonIndex == [actionSheet cancelButtonIndex]) {
exit(0);
}
}
15、給window設置全局背景圖片
self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@""]];
16、tabcontroller隨意切換tabbar
-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
或者
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
或者
_tabBarController.selectedIndex = tabIndex;
17、計算字符串⻓度:
CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial" size: 18]].width;
18、計算點到線段的最短距離
根據結果座標使⽤用CLLocation類的函數計算實際距離。 double
x1, y1, x2, y2, x3, y3;
double px =x2 -x1;
double py = y2 -y1;
double som = px *px + py *py;
double u =((x3 - x1)*px +(y3 - y1)*py)/som; if(u > 1)
{ u=1; }
if (u < 0) { u =0;
}
//the closest point
double x = x1 + u *px; double y = y1 + u * py; double dx = x - x3; double dy = y - y3;
double dist = sqrt(dx*dx + dy*dy);
19、UISearchBar背景透明
在使用UISearchBar時,將背景⾊設定爲clearColor,或者將translucent設爲YES,都
不能使背景透明,經過一番研究,發現了一種超級簡單和實用的⽅法:
[[searchbar.subviews objectAtIndex:0] removeFromSuperview];
背景完全消除了,只剩下搜索框本身了。
20、圖像與緩存 :
UIImageView *wallpaper = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"icon.png"]]; // 會緩存圖片
UIImageView *wallpaper = [[UIImageView alloc] initWithImage: [UIImage imageWithContentsOfFile:@"icon.png"]]; // 不會緩存圖⽚片
21、iphone對視圖層的操作
// 將textView的邊框設置爲圓角
_textView.layer.cornerRadius = 8;
_textView.layer.masksToBounds = YES;
//給textView添加一個有色邊框
_textView.layer.borderWidth = 5;
_textView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09
blue:0.07 alpha:1] CGColor];
//textView添加背景圖片
_textView.layer.contents = (id)[UIImage imageNamed:@"31"].CGImage;
22、關閉當前應用
[[UIApplication sharedApplication] performSelector:@selector(terminateWithSuccess)];
23、給iPhone程序添加歡迎界面
1、將你需要的歡迎界面的圖片,存成Default.png
[NSThread sleepForTimeInterval:10.0]; 這樣歡迎頁面就停留10秒後消失了。
24、NSString NSDate轉換
NSString* myString= @"testing";
NSData* data=[myString dataUsingEncoding: [NSString defaultCStringEncodi ng]];
NSString* aStr =
[[NSString alloc] initWithData:aData encoding:NSASCIIStringEncoding];
25、UIWebView中的dataDetectorTypes
如果你希望在瀏覽頁面時,頁面上的電話號碼顯示成鏈接形式,點擊電話號碼就撥打電話,這時你就需要用到dataDetectorTypes了。
NSURL *url = [NSURL URLWithString:@"http://2015.iteye.com"];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; webView.dataDetectorTypes = UIDataDetectorTypePhoneNumber;
[webView loadRequest:requestObj];
26、打開蘋果電腦瀏覽器的代碼
如您想在 Mac 軟件中集成一鍵打開瀏覽器功能,可以使用以下代碼
[[NSWorkspace sharedWorkspace] openURLs: urls withAppBundleIdentifier:@"com.apple.Safari"
options: NSWorkspaceLaunchDefault additionalEventParamDescriptor: NULL launchIdentifiers: NULL];
27、設置StatusBar以及NavigationBar的樣式
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque; self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
28、隱藏Status Bar 你可能知道一個簡易的方法,那就是在程序的viewDidLoad中加入以下代碼:
[UIApplication sharedApplication].statusBarHidden = YES;
此法可以隱藏狀態條,但問題在於,狀態條所佔空間依然無法爲程序所用。
本篇介紹的方法依然簡單,但更爲奏效。通過簡單的3個步驟,在plist中加入一 個鍵值來實現。
1. 點擊程序的Info.plist
2. 右鍵點擊任意一處,選擇Add Row
3. 加入的新鍵值,命名爲UIStatusBarHidden或者Status bar is initially hidden,然後選上這一項。
29、產生隨機數的最佳方案
arc4random()會返回一個整型數,因此,返回1至100的隨機數可以這樣寫:
arc4random()%100 + 1;
30、string 和char轉換
NSString *cocoaString = [[NSString alloc] initWithString:@"MyString"];
const char *myCstring = [cocoaString cString];
const char *cString = "Hello";
NSString *cocoString = [[NSString alloc] initWithCString:cString];
31、用UIWebView在當前程序中打開網頁 如果URL中帶中文的話,必須將URL中的中文轉成URL形式的才行。
NSString *query = [NSString stringWithFormat:@"http://www.baidu.com?q=蘋 果"];
NSString *strUrl = [query stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:strUrl];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];
32、阻止ios設備鎖屏
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
或
[UIApplication sharedApplication].idleTimerDisabled = YES;
33、一條命令卸載Xcode和 iPhone SDK
sudo /Developer/Library/uninstall-devtools --mode=all
34、獲取按鈕的title
-(void)btnPressed:(id)sender {
NSString *title = [sender titleForState:UIControlStateNormal];
NSString *newText = [[NSString alloc] initWithFormat:@"%@",title];
label.text = newText;
[newText release];
}
35、NSDate to NSString
NSString *dateStr = [[NSString alloc] initWithFormat:@"%@", date];
或者
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@"%@", strDate);
[dateFormatter release];
36、圖片由小到大緩慢顯示的效果
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[imageView setImage:[UIImage imageNamed:@"4.jpg"]];
self.ANImageView = imageView;
[self.view addSubview:imageView];
[imageView release];
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:2.5];
CGImageRef img = [self.ANImageView.image CGImage];
[ANImageView setFrame:CGRectMake(0, 0, CGImageGetWidth(img), CGImageGetHeight(img))];
[UIView commitAnimations];
NSLog(@"%lu",CGImageGetWidth(img));
NSLog(@"%lu",CGImageGetHeight(img));
37、數字轉字符串
NSString *newText = [[NSString alloc] initWithFormat:@"%d",number];
numberlabel.text = newText;
[newText release];
38、隨機函數arc4random() 的使用.
在iPhone中,RAND_MAX是0x7fffffff (2147483647),而arc4random()返回的 最大值則是 0x100000000 (4294967296),從而有更好的精度。使用 arc4random()還不需要生成隨機種子,因爲第一次調用的時候就會自動生成。
如:
arc4random() 來獲取0到100之間浮點數
#define ARC4RANDOM_MAX 0x100000000
double val = floorf(((double)arc4random() / ARC4RANDOM_MAX) * 100.0f);
1. self.view.backgroundColor = [UIColor colorWithHue: arc4random() % 2 55 / 255
2. 3. 4.
saturation: arc4random() % 2 brightness: arc4random() % 2
alpha: 1.0];
39、改變鍵盤顏色的實現
iPhone和iPod touch的鍵盤顏色其實是可以通過代碼更改的,這樣能更匹配 App的界面風格,下面是改變iPhone鍵盤顏⾊色的代碼。
-(void)textFieldDidBeginEditing:(UITextField *)textField {
NSArray *ws = [[UIApplication sharedApplication] windows];
for(UIView *w in ws)
{
NSArray *vs = [w subviews];
for(UIView *v in vs)
{
if([[NSString stringWithUTF8String:object_getClassName(v)] isEqualToString:@"UIPeripheralHostView"])
{
v.backgroundColor = [UIColor blueColor];
} }
} }
55 / 255 55 / 255
_textField.keyboardAppearance = UIKeyboardAppearanceAlert;//有這個設置屬性 才起作用
40、iPhone上實現Default.png動畫 添加一張和Default.png⼀一樣的圖片,對這個圖片進行動畫,從而實現Default動畫的漸變消 失的效果。
UIImageView *splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
splashView.image = [UIImage imageNamed:@"Default.png"];
[self.window addSubview:splashView];
[self.window bringSubviewToFront:splashView];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:
self.window cache:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:cont ext:)];
splashView.alpha = 0.0;
splashView.frame = CGRectMake(-60, -85, 440, 635);
[UIView commitAnimations];
41、將EGO主題色添加到xcode中 打開終端,執行以下命令
Shell代碼
1. mkdir -p ~/Library/Application\ Support/Xcode/Color\ Themes; 2. cd ~/Library/Application\ Support/Xcode/Color\ Themes;
3. curl -O http://developers.enormego.com/assets/egotheme/
EGO.xccolortheme
然後,重啓Xcode,選擇Preferences > Fonts & Colors,最後從Color Theme 中選擇EGO即可。
42、將圖片保存到圖片庫中
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch tapCount]== 1)
{
UIImageWriteToSavedPhotosAlbum([ANImageView image], nil, nil, nil);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"存儲照⽚片 message:@"您已將照⽚存於圖片庫中,打開照片程序即可查" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
43、讀取plist文件
//取得文件路徑
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"文件
名" ofType:@"plist"];
//讀取到一個字典
NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
//讀取到一個數組
NSArray *array = [[NSArray alloc] initWithContentsOfFile:plistPath];
44、使用#pragma mark 加上這樣的標識後,在導航條上會顯示源文件上方法列表,這樣就可對功能相關的方法進行分隔,方便查看了。
設置UITabBarController默認的啓動Item //a tabBar
UITabBarController *tabBarController = [[UITabBarController alloc] init];
NSArray *controllers = [NSArray arrayWithObjects: nav1, nav2, nav3, nav4, nil];
tabBarController.viewControllers = controllers; tabBarController.selectedViewController = nav2;
45、NSUserDefaults的使用
NSUserDefaults *store = [NSUserDefaults standardUserDefaults];
NSUInteger selectedIndex = 1;
[store setInteger:selectedIndex forKey:@"selectedIndex"];
if ([store valueForKey:@"selectedIndex"] != nil) {
NSInteger index = [store integerForKey:@"selectedIndex"];
NSLog(@"⽤用戶已經設置的selectedIndex的值是:%d", index);
}
else {
NSLog(@"請設置默認的值");
}
46、更改Xcode的缺省公司名 在終端中執行以下命令:
defaults write com.apple.Xcode PBXCustomTemplateMacroDefiniti ons '{"ORGANIZATIONNAME" = "COMPANY";}'
47、設置uiView,成圓角矩形 畫個圓角的矩形沒啥難的,有兩種方法:
1 。直接修改view的樣式,系統提供好的了:
view.layer.cornerRadius = 6;
view.layer.masksToBounds = YES; 用layer做就可以了,十分簡單。這個需要倒庫 QuartzCore.framework;
2. 在view 裏面畫圓角矩形 CGFloat radius = 20.0;
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1);
CGFloat minx = CGRectGetMinX(rect), midx = CGRectGetMidX(rect), maxx =
CGRectGetMaxX(rect);
CGFloat miny = CGRectGetMinY(rect), midy = CGRectGetMidY(rect), maxy =
CGRectGetMaxY(rect);
CGContextMoveToPoint(context, minx, midy); CGContextAddArcToPoint(context, minx, miny, midx, miny, radius); CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius); CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius); CGContextAddArcToPoint(context,
minx, maxy, minx, midy, radius); CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFill);
用畫筆的方法,在drawRect裏面做。
48、畫圖時圖片倒轉解決方法
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, self.bounds.size.height); CGContextScaleCTM(context, 1, -1);
drawImage = [UIImage imageNamed:@"12.jpg"];
CGImageRef image = CGImageRetain(drawImage.CGImage);
CGContextDrawImage(context, CGRectMake(30.0, 200, 450, 695), image); CGContextRestoreGState(context);
49、Nsstring 自適應文本寬高度
CGSize feelSize = [feeling sizeWithFont:[UIFont systemFontOfSize:12]
constrainedToSize:CGSizeMake(190, 200)];
float feelHeight = feelSize.height;
50、用HTTP協議,獲取www.baidu.com網站的HTML數據:
[NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.baidu.com"]];
51、viewDidLoad中設置按鈕圖案
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(0, 0, 60, 30);
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
UIImage *buttonImageNormal = [UIImage imageNamed:@"huifu-001.png"];
UIImage *stretchableButtonImageNormal = [buttonImageNormal
stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[button setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; UIImage *buttonImagePressed = [UIImage imageNamed:@"qyanbuhuifu-001.png"];
UIImage *stretchableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[button setBackgroundImage:stretchableButtonImagePressed forState:UIControlStateHighlighted];
52、鍵盤上的return鍵改成Done: textField.returnKeyType = UIReturnKeyDone;
53、textfield設置成爲密碼框: [textField_pwd setSecureTextEntry:YES];
54、收回鍵盤: [textField resignFirstResponder]; 或者 [textfield addTarget:self action:@selector(textFieldDone:) forControlEvents:UIControlEventEditin gDidEndOnExit];
55、振動:
#import<AudioToolbox/AudioToolbox.h> //需加頭文件
方法一: AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
方法二: AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); 當設備不支持方法一函數時,起蜂鳴作用, 而方法二支持所有設備
56、用Cocoa刪除文件:
NSFileManager *defaultManager = [NSFileManager defaultManager];
[defaultManager removeFileAtPath: tildeFilename handler: nil];
57、UIView透明漸變與移動效果:
//動畫配製開始
[UIView beginAnimations:@"animation" context:nil]; [UIView setAnimationDuration:2.5];
//圖片上升動畫
CGRect rect = imgView.frame ;
rect.origin.y = 30;
imgView.frame = rect;
//半透明度漸變動畫
imgView.alpha = 0;
//提交動畫
[UIView commitAnimations];
58、在UIView的drawRect方法內,用Quartz2D API繪製一個像素寬的水平直線:
-(void)drawRect:(CGRect)rect{
//獲取圖形上下文
CGContextRef context = UIGraphicsGetCurrentContext(); //設置圖形上下文的路徑繪製顏色 CGContextSetStrokeColorWithColor(context, [UIColor
whiteColor].CGColor); //取消防鋸齒
CGContextSetAllowsAntialiasing(context, NO); //添加線
CGContextMoveToPoint(context, 50, 50);
CGContextAddLineToPoint(context, 100, 50); //繪製
CGContextDrawPath(context, kCGPathStroke); }
59、用UIWebView加載: www.baidu.com
UIWebView *web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[web loadRequest:[NSURLRequest requestWithURL: [NSURL URLWithString:@"http://www.baidu.com"]]];
[self.view addSubview:web];
[web release];
60、利用UIImageView實現動畫:
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *fishAni=[[UIImageView alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
[self.view addSubview:fishAni];
[fishAni release];
//設置動畫幀
fishAni.animationImages=[NSArray arrayWithObjects: [UIImage imageNamed:@"1.jpg"],
[UIImage imageNamed:@"2.jpg"],
[UIImage imageNamed:@"3.jpg"],
[UIImage imageNamed:@"4.jpg"],
[UIImage imageNamed:@"5.jpg"],nil ];
//設置動畫總時間 fishAni.animationDuration=1.0;
//設置重複次數,0表示不重複 fishAni.animationRepeatCount=0;
//開始動畫
[fishAni startAnimating]; }
61、用NSTimer做一個定時器,每隔1秒執行一次 pressedDone;
-(IBAction)clickBtn:(id)sender{
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(printHello) userInfo:nil repeats:YES];
[timer fire];
}
62、利用蘋果機裏的相機進行錄像:
-(void) choosePhotoBySourceType: (UIImagePickerControllerCameraCaptureMode) sourceType {
m_imagePickerController = [[[UIImagePickerController alloc] init] autorelease];
m_imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
m_imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; m_imagePickerController.cameraDevice =UIImagePickerControllerCameraDeviceFront;
//m_imagePickerController.cameraCaptureMode =UIImagePickerControllerCameraCaptureModeVideo;
NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:m_imagePickerController.sourceType];
if ([sourceTypes containsObject:(NSString *)kUTTypeMovie ]) {
m_imagePickerController.mediaTypes= [NSArray arrayWithObjects: (NSString *)kUTTypeMovie,(NSString *)kUTTypeImage,nil];
}
// m_imagePickerController.cameraCaptureMode = sourceType; //m_imagePickerController.mediaTypes //imagePickerController.allowsEditing = YES;
[self presentModalViewController: m_imagePickerController animated:YES];
}
-(void) takePhoto {
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
[self choosePhotoBySourceType:nil];
} }
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *takePhoto = [UIButton
buttonWithType:UIButtonTypeRoundedRect];
[takePhoto setTitle:@"錄像" forState:UIControlStateNormal];
[takePhoto addTarget:self action:@selector(takePhoto) forControlEvents:UIControlEventTouchUpInside];
takePhoto.frame = CGRectMake(50,100,100,30); [self.view addSubview:takePhoto];
}
63、App中調用 iPhone的home + 電源鍵截屏功能
// 前置聲明是消除警告
CGImageRef UIGetScreenImage();
CGImageRef img = UIGetScreenImage();
UIImage* scImage=[UIImage imageWithCGImage:img]; UIImageWriteToSavedPhotosAlbum(scImage, nil, nil, nil);
64、切割圖片的方法
//切割圖片
UIImage *image = [UIImage imageNamed:@"7.jpg"];
//設置需要截取的⼤大⼩小
CGRect rect = CGRectMake(20, 50, 280, 200);
//轉換
CGImageRef imageRef = image.CGImage;
//截取函數
CGImageRef imageRefs = CGImageCreateWithImageInRect(imageRef, rect);
//生成uIImage
UIImage *newImage = [[UIImage alloc] initWithCGImage:imageRefs];
//添加到imageView中
imageView = [[UIImageView alloc] initWithImage:newImage];
imageView.frame = rect;
65、如何屏蔽父view的touch事件
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path,NULL,0,0);
CGRect rect = CGRectMake(0, 100, 320, 40); CGPathAddRect(path, NULL, rect); if(CGPathContainsPoint(path, NULL, point, NO)) {
[self.superview touchesBegan:nil withEvent:nil]; }
CGPathRelease(path);
return self;
}
66、用戶按home鍵推送通知
UIApplication *app = [UIApplication sharedApplication];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pressHome:) name:UIApplicationDidEnterBackgroundNotification object:app];
-(void)pressHome:(NSNotification *)notification {
NSLog(@"pressHome...");
}
67、在UIImageView中旋轉圖像:
float rotateAngle = M_PI; //M_PI爲一角度
CGAffineTransform transform =CGAffineTransformMakeRotation(rotateA ngle);
imageView.transform = transform;
68、隱藏狀態欄:
方法一, [UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
方法二, 在應用程序的Info.plist 文件中將 UIStatusBarHidden 設置爲YES;
69、構建多個可拖動視圖:
@interface DragView: UIImageView{
CGPoint startLocation;
NSString *whichFlower; }
@property (nonatomic ,retain)NSString *whichFlower; @end
@implementation DragView
@synthesize whichFlower;
- (void) touchesBegan:(NSSet *)touches withEvent: (UIEvent *)event{ CGPoint pt = [[touhes anyObject ] locationInView:self]; startLocation = pt;
[[self superview] bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet *)touches withEvent:( UIEvent *)event{
CGPoint pt = [[touches anyObject] locatonInView:self]; CGRect frame = [self frame];
frame.origin.x += pt.x – startLocation.x;
frame.origin.y += pt.y - startLocation.y;
[self setFrame:frame]; }
@end
@interface TestController :UIViewController{
UIView *contentView;
}
@end
@implementation TestController
#define MAXFLOWERS 16
CGPoint randomPoint(){
return CGPointMake(random()%6 , random()96);
}
- (void)loadView{
CGRect apprect = [[UIScreen mainScreen] applicationFrame];
contentView = [[UIView alloc] initWithFrame :apprect];
contentView.backgroundColor = [UIColor blackColor];
self.view = contentView;
[contentView release];
for(int i=0 ; i<MAXFLOWERS; i++){
CGRect dragRect = CGRectMake(0.0f ,0.0f, 64.0f ,64.0f);
dragRect.origin = randomPoint();
DragView *dragger = [[DragView alloc] initWithFrame:dragRect];
[dragger setUserInteractionEnabled: YES];
NSString *whichFlower = [[NSArray arrayWithObjects:@”blueFlower.png”,@”pinkFlower.png”,nil] objectAtIndex: ( random() %2)];
[dragger setImage:[UIImage imageNamed:whichFlower]];
[contentView addSubview :dragger];
[dragger release];
} }
- (void)dealloc{
[contentView release];
[super dealloc];
}
@end
70、iPhone中加入dylib庫
加入dylib庫時,必須在info中加入頭文件路徑。/usr/include/庫名(不要後綴)
71、iPhone iPad 中App名字如何支持多語言和顯示自定義名字
建立InfoPlist.strings,本地化此文件,然後在文件內添加: CFBundleDisplayName = "xxxxxxxxxxx"; //
這樣應⽤用程序就能顯示成設置的名字“xxxxxxxxxxx”.
72、在數字鍵盤上添加button:
//定義一個消息中心
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//addObserver:註冊一個觀察員 name:消息名稱
- (void)keyboardWillShow:(NSNotification *)note {
// create custom button
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
[doneButton setImage:[UIImage imageNamed:@"5.png"]
forState:UIControlStateNormal];
[doneButton addTarget:self action:@selector(addRadixPoint) forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
//返回應用程序window
UIView* keyboard;
for(int i=0; i<[tempWindow.subviews count]; i++)
//遍歷window上的所有 subview
{
keyboard = [tempWindow.subviews objectAtIndex:i];
// keyboard view found;
add the custom button to it
if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES)
[keyboard addSubview:doneButton];
}
}
73、去掉iPhone應用圖標上的弧形高光 有時候我們的應用程序不需要在圖標上加上默認的高光,可以在你的應用的 Info.plist中加入:
Icon already includes gloss effects YES
74、實現修改navigation的back按鈕
self.navigationItem.backBarButtonItem =
[[[UIBarButtonItem alloc] initWithTitle: NSLocalizedStringFromTable (@"返回", @"System", nil) style:UIBarButtonItemStyleBordered target:nil action:nil] autorelease];
75、給圖片加上陰影
UIImageView*pageContenterImageView = [[UIImageView alloc]initWithImage: [UIImage imageNamed:@"onePageApple.png"]];
//添加邊框
CALayer*layer = [pageContenterImageView layer];
layer.borderColor= [[UIColor whiteColor]CGColor];
layer.borderWidth=0.0f;
//添加四個邊陰影
pageContenterImageView.layer.shadowColor= [UIColor blackColor].CGColor;
pageContenterImageView.layer.shadowOffset=CGSizeMake(0,0); pageContenterImageView.layer.shadowOpacity=0.5; pageContenterImageView.layer.shadowRadius=5.0; 陰影渲染會嚴重消耗內存 ,導致程序咔嘰.
/*陰影效果*/
//添加邊框
CALayer*layer = [self.pageContenter layer];
layer.borderColor= [[UIColorwhiteColor]CGColor];
layer.borderWidth=0.0f;
//添加四個邊陰影
self.pageContenter.layer.shadowColor= [UIColorblackColor].CGColor;//陰影顏色
self.pageContenter.layer.shadowOffset=CGSizeMake(0,0);//陰影偏移 self.pageContenter.layer.shadowOpacity=0.5;//陰影不透明度 self.pageContenter.layer.shadowRadius=5.0;//陰影半徑
⼆二、給視圖加上陰影
UIView * content=[[UIView alloc] initWithFrame:CGRectMake(100, 250, 503, 500)];
content.backgroundColor=[UIColor orangeColor];
//content.layer.shadowOffset=10;
content.layer.shadowOffset = CGSizeMake(5, 3); content.layer.shadowOpacity = 0.6; content.layer.shadowColor = [UIColor blackColor].CGColor;
[self.window addSubview:content];
76、UIView有一個屬性,clipsTobounds 默認情況下是NO, 如果,我們想要view2把超出的那部份隱藏起來的話,就得改變它的父視圖也 就view1的clipsTobounds屬性值。
view1.clipsTobounds = YES;
使用objective-c 建立UUID UUID是128位的值,它可以保證唯一性。通常,它是由機器本身網卡的MAC地
址和當前系統時間來生成的。 UUID是由中劃線連接而成的字符串。例如:0A326293-BCDD-4788-8F2D-
C4D8E53C108B
在聲明文件中聲明一個方法:
#import <UIKit/UIKit.h>
@interface UUIDViewController : UIViewController { }
- (NSString *) createUUID;
@end
對應的實現文件中實現該方法:
- (NSString *) createUUID {
CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);
NSString *uuidStr = (NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject);
CFRelease(uuidObject);
return uuidStr; }
77、iPhone iPad中橫屏顯示代碼
1、強制橫屏
[application setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];
2、在infolist⾥裏⾯面加了Supported interface orientations這⼀一項,增加之後添加四個item就是 ipad的四個⽅方向
item0 UIInterfaceOrientationLandscapeLeft
item1 UIInterfaceOrientationLandscapeRight 這表明只⽀支持橫屏顯⽰示 經常讓人混淆迷惑的問題 - 數組和其他集合類
78、當一個對象被添加到一個array, dictionary, 或者 set等這樣的集合類型中的時候,集合會retain它。 對應 的,當集合類被release的時候,它會發送對應的release消息給包含在其中的對象。 因此,如果你想建立一 個包含一堆number的數組,你可以像下面示例中的幾個方法來做
NSMutableArray *array; int i;
// ...
for (i = 0; i < 10; i++) {
NSNumber *n = [NSNumber numberWithInt: i];
[array addObject: n]; }
在這種情況下, 我們不需要retain這些number,因爲array將替我們這麼做。 NSMutableArray *array;
int i;
// ...
for (i = 0; i < 10; i++) {
NSNumber *n = [[NSNumber alloc] initWithInt: i];
[array addObject: n];
[n release];
}
在這個例子中,因爲你使用了-alloc去建立了一個number,所以你必須顯式的-release它,以保證retain count的平衡。因爲將number加入數組的時候,已經retain它了,所以數組中的number變量不會被release
79、UIView動畫停止調用方法遇到的問題
在實現UIView的動畫的時候,並且使⽤用UIView來重複調⽤用它結束的回調時候要 注意以下⽅方法中的finished參數
-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
if([finishied boolValue] == YES)
//一定要判斷這句話,要不在程序中當多個View刷新的時候,就可能出現動畫異常的現象 {
//執行想要的動作 }
}
80、判斷在UIViewController中,viewWillDisappear的時候是push還是 pop出來
- (void)viewWillDisappear:(BOOL)animated {
NSArray *viewControllers = self.navigationController.viewControllers; if (viewControllers.count > 1 && [viewControllers
objectAtIndex:viewControllers.count-2] == self) {
// View is disappearing because a new view controller was pushed onto the
stack
NSLog(@"New view controller was pushed");
} else if ([viewControllers indexOfObject:self] == NSNotFound) { // View is disappearing because it was popped from the stack NSLog(@"View controller was popped");
} }
81、連接字符串小技巧
NSString *string1 = @"abc / cde";
NSString *string2 = @"abc" @"cde";
NSString *string3 = @"abc" "cde";
NSLog( @"string1 is %@" , string1 );
NSLog( @"string2 is %@" , string2 ); NSLog( @"string3 is %@" , string3 );
打印結果如下:
string1 is abc cde string2 is abccde
82、隨文字大小label自適應
label=[[UILabel alloc] initWithFrame:CGRectMake(50, 23, 175, 33)];
label.backgroundColor = [UIColor purpleColor];
[label setFont:[UIFont fontWithName:@"Helvetica" size:30.0]];
[label setNumberOfLines:0];
//[myLable setBackgroundColor:[UIColor clearColor]]; [self.window addSubview:label];
NSString *text = @"this is ok";
UIFont *font = [UIFont fontWithName:@"Helvetica" size:30.0];
CGSize size = [text sizeWithFont: font constrainedToSize: CGSizeMake(175.0f, 2000.0f) lineBreakMode: UILineBreakModeWordWrap];
CGRect rect= label.frame; rect.size = size;
[label setFrame: rect]; [label setText: text];
83、UILabel字體加粗
//加粗
lb.font = [UIFont fontWithName:@"Helvetica-Bold" size:20]; //加粗並且傾斜
lb.font = [UIFont fontWithName:@"Helvetica-BoldOblique" size:20];
84、爲IOS應用組件添加圓角的方法 具體的實現是使用QuartzCore庫,下面我具體的描述一下實現過程:
• 首先創建一個項目,名字叫:ipad_webwiew
• 利⽤用Interface Builder添加⼀一個UIWebView,然後和相應的代碼相關聯 • 添加QuartzCore.framework
代碼實現: 頭⽂文件:
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface ipad_webwiewViewController : UIViewController {
IBOutlet UIWebView *myWebView; UIView *myView;
}
@property (nonatomic,retain) UIWebView *myWebView; @end
代碼實現:
- (void)viewDidLoad {
[super viewDidLoad]; //給圖層添加背景圖⽚片: //myView.layer.contents = (id)[UIImage
imageNamed:@"view_BG.png"].CGImage; //將圖層的邊框設置爲圓腳
myWebView.layer.cornerRadius = 8; myWebView.layer.masksToBounds = YES; //給圖層添加⼀一個有⾊色邊框
myWebView.layer.borderWidth = 5; myWebView.layer.borderColor = [[UIColor colorWithRed:0.52
green:0.09 blue:0.07 alpha:1] CGColor]; }
85、實現UIToolBar的自動消失
-(void)showBar
{
! [UIView beginAnimations:nil context:nil];
! [UIView setAnimationDuration:0.40];
! (_toolBar.alpha == 0.0) ? (_toolBar.alpha = 1.0) : (_toolBar.alpha = 0.0);
! [UIView commitAnimations];
}
- (void)viewDidAppear:(BOOL)animated {
[NSObject cancelPreviousPerformRequestsWithTarget: self];
[self performSelector: @selector(delayHideBars) withObject: nil afterDelay: 3.0];
}
- (void)delayHideBars { [self showBar];
}
86、自定義UINavigationItem.rightBarButtonItem
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"remote",@"mouse",@"text",nil]];
[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"home_a.png"] atIndex:0 animated:YES];
[segmentedControl insertSegmentWithImage:[UIImage imageNamed:@"myletv_a.png"] atIndex:1 animated:YES];
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar; segmentedControl.frame = CGRectMake(0, 0, 200, 30);
[segmentedControl setMomentary:YES];
[segmentedControl addTarget:self action:@selector(segmentAction:)
forControlEvents:UIControlEventValueChanged];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
self.navigationItem.rightBarButtonItem = barButtonItem;
[segmentedControl release];
UINavigationController直接返回到根viewController
[self.navigationController popToRootViewControllerAnimated:YES];
想要從第五層直接返回到第二層或第三層,用索引的形式
[self.navigationController popToViewController: [self.navigationController.viewControllers objectAtIndex: ([self.navigationController.viewControllers count] - 2)] animated:YES];
87、鍵盤監聽事件
#ifdef __IPHONE_5_0
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 5.0)
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
#endif
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
-(void)keyboardWillShow:(NSNotification *)notification {
NSValue *value = [[notification userInfo] objectForKey:@"UIKeyboardFrameEndUserInfoKey"];
CGRect keyboardRect = [value CGRectValue]; NSLog(@"value %@ %f",value,keyboardRect.size.height); [UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.25];
keyboardHeight = keyboardRect.size.height; self.view.frame = CGRectMake(0, -(251 - (480 - 64 -
keyboardHeight)), self.view.frame.size.width, self.view.frame.size.height);
[UIView commitAnimations]; }
88、 ios6.0強制橫屏的方法:
在appDelegate裏調用
if (!UIDeviceOrientationIsLandscape([[UIDevice currentDevice] orientation])) {
[[UIApplication sharedApplication]
setStatusBarOrientation:
UIInterfaceOrientationLandscapeRight animated:NO];
}
轉自http://blog.csdn.net/fhbystudy/article/details/8956066
