藍懿 ios技術交流和心得分享12.28

- (void)viewDidLoad { [super viewDidLoad]; // 1.監聽通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.accountField]; } //監聽結束需要移除- (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; }

#import "TutorialProjectViewController.h"@implementation TutorialProjectViewController@synthesize threadValueLabel, threadProgressView, testValueLabel, threadStartButton;// ------ Tutorial code starts here ------- (IBAction) startThreaonPressed:(UIButton *)sender { threadStartButton.hidden = YES; threadValueLabel.text = @"0"; threadProgressView.progress = 0.0; [NSThread detachNewThreadSelector:@selector(startTheBackgroundJob) toTarget:self withObject:nil]; }- (void)startTheBackgroundJob { //註冊一個監聽者 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(Update) name:@"UpdateTableView" object:nil]; NSLog(@"1111111111"); NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // wait for 3 seconds before starting the thread, you don't have to do that. This is just an example how to stop the NSThread for some time [NSThread sleepForTimeInterval:3]; [self performSelectorOnMainThread:@selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO]; [pool release]; }- (void)makeMyProgressBarMoving { xx++;// NSLog(@"22222222 %i",xx); float actual = [threadProgressView progress]; threadValueLabel.text = [NSString stringWithFormat:@"%.2f", actual]; if (actual < 1) { threadProgressView.progress = actual + 0.01; [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(makeMyProgressBarMoving) userInfo:nil repeats:NO]; } if (xx==5||xx==15) { //發出一個消息。此前註冊的監聽者可以發現這個消息，並且出發相應的方法 [[NSNotificationCenter defaultCenter] postNotificationName:@"UpdateTableView" object:nil]; NSLog(@"xxxxxxxxxxxxxx==3"); } if (xx==10) { //取消監聽。 [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UpdateTableView" object:nil]; } else threadStartButton.hidden = NO; }//受到監聽的消息時，調用這個函數-(void)Update{ NSLog(@"----------sdafs");}- (IBAction) testValueSliderChanged:(UISlider *)sender { testValueLabel.text = [NSString stringWithFormat:@"%.2f", sender.value]; }// ------ Tutorial code ends here ------- (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use.}- (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil;}// This function is for button which takes you to the xprogress.com website- (IBAction) runXprogressComButton: (id) sender { NSURL *url = [ [ NSURL alloc ] initWithString: @"http://www.xprogress.com/" ]; [[UIApplication sharedApplication] openURL:url];}- (void)dealloc { // ------ Tutorial code starts here ------ [threadValueLabel release]; [threadProgressView release]; [threadStartButton release]; [testValueLabel release]; // ------ Tutorial code ends here ------ [super dealloc];}@end

UITapGestureRecognizer

UIPinchGestureRecognizer
UIRotationGestureRecognizer
UISwipeGestureRecognizer
UIPanGestureRecognizer
UILongPressGestureRecognizer

從命名上不難了解這些類別所對應代表的手勢，分別是 Tap（點一下）、Pinch（二指往內或往外撥動）、Rotation（旋轉）、Swipe（滑動，快速移動）、Pan （拖移，慢速移動）以及 LongPress（長按）。這些手勢別在使用上也很簡單，只要在使用前定義並添加到對應的視圖上即可。

// 定義一個 recognizer, 並加到需要偵測該手勢的 UIView 元件上

(void)viewDidLoad {

UISwipeGestureRecognizer

recognizer;

// handleSwipeFrom 是偵測到手勢，所要呼叫的方法

recognizer

= [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom)];

// 不同的 Recognizer 有不同的實體變數

// 例如 SwipeGesture 可以指定方向

// 而 TapGesture 則可以指定次數

recognizer

direction

= UISwipeGestureRecognizerDirectionUp

[

self

view

addGestureRecognizer:recognizer];

[

recognizer

release];

}

(void)handleSwipeFrom:(UISwipeGestureRecognizer*)recognizer {

// 觸發手勢事件後，在這裏作些事情

// 底下是刪除手勢的方法

[

self

view

removeGestureRecognizer:recognizer];

}

問題來了。有些手勢其實是互相關聯的，例如 Tap 與 LongPress、Swipe與 Pan，或是 Tap 一次與Tap 兩次。當一個 UIView 同時添加兩個相關聯的手勢時，到底我這一下手指頭按的要算是 Tap 還是 LongPress？如果照預設作法來看，只要「先滿足條件」的就會跳出並呼叫對應方法，舉例來說，如果同時註冊了 Pan 和 Swipe，只要手指頭一移動就會觸發 Pan 然後跳出，因而永遠都不會發生 Swipe；單點與雙點的情形也是一樣，永遠都只會觸發單點，不會有雙點。

那麼這個問題有解嗎？答案是肯定的，

UIGestureRecognizer

有個方法叫做

requireGestureRecognizerToFail

，他可以指定某一個 recognizer，即便自己已經滿足條件了，也不會立刻觸發，會等到該指定的 recognizer 確定失敗之後才觸發。以同時支持單點與雙點的手勢爲例，代碼如下：

(void)viewDidLoad {

// 單擊的 Recognizer

UITapGestureRecognizer

singleRecognizer;

singleRecognizer

= [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSingleTapFrom)];

singleTapRecognizer

numberOfTapsRequired

= 1; // 單擊

[

self

view

addGestureRecognizer:singleRecognizer];

// 雙擊的 Recognizer

UITapGestureRecognizer

double;

doubleRecognizer

= [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleDoubleTapFrom)];

doubleTapRecognizer

numberOfTapsRequired

= 2; // 雙擊

[

self

view

addGestureRecognizer:doubleRecognizer];

// 關鍵在這一行，如果雙擊確定偵測失敗才會觸發單擊

[

singleRecognizer

requireGestureRecognizerToFail:doubleRecognizer];

[

singleRecognizer

release];

[

doubleRecognizer

release];

}

學習ios 重要還是要理清楚思路在做或者看老師代碼的時候自己多想想爲什麼不要自己看着就抄另外還是要推薦一下藍懿IOS這個培訓機構和劉國斌老師劉國斌老師還是很有名氣的，聽朋友說劉老師成立了藍懿iOS，，老師講課方式很獨特，能夠儘量讓每個人都能弄明白，有的比較難懂的地方，如果有的地方還是不懂得話，老師會換個其它方法再講解，這對於我們這些學習iOS的同學是非常好的，多種方式的講解會理解得更全面，這個必須得給個贊，嘻嘻，還有就是這裏的學習環境很好，很安靜，可以很安心的學習，安靜的環境是學習的基礎，小班講課，每個班20幾個學生，學習氛圍非常好，每天都學到9點多才離開教室，練習的時間很充裕，而且如果在練習的過程中有什麼困難，隨時可以向老師求助，不像其它機構，通過視頻教學，有的甚至學完之後都看不到講師本人，問點問題都不方便，這就是藍懿與其它機構的區別，相信在劉國斌老師的細心指導下，每個藍懿學員都能找到滿意的工作，加油！

寫博客第七十九天；

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    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];

在鍵盤將要出現和隱藏的回調中，加入動畫。

- (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    
    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        
        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];

在鍵盤將要出現和隱藏的回調中，加入動畫。

- (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    
    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        
        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

藍懿 ios技術交流和心得分享12.28

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藍懿 ios技術交流和心得分享12.28

藍懿ios技術交流和心得分享16.1.7

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