iOS零碎小知識

1. 使應用不會自動鎖屏。
   

   [UIApplication sharedApplication].idleTimerDisabled=YES;//不自動鎖屏
   [UIApplication sharedApplication].idleTimerDisabled=NO;//自動鎖屏

   
   
2. 程序圖標不加高光效果
   iOS程序build到手機上時，默認的桌面圖標是有高亮的光圈效果的。如果您要去掉這一高亮特效，可以在程序的 info.plist 設置Icon already includes gloss effects，值設定爲YES，默認值是NO。程序上傳到App Store 也就不會在圖標上添加高亮特效了。
   
   
3. 判斷屏幕分辨率
   BOOL retina = CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size);
   返回true說明當前分辨率是CGSizeMake(640, 960)，false則不是
   
   
4. 遇到類似這樣的錯誤failed to get the task for process XXX
   多半是證書問題，project和targets證書都要是可用並且正確的證書才行。
   
   
5. 出現這樣的問題Property's synthesized getter follows Cocoa naming convention for returning 
   Property's synthesized getter follows Cocoa naming convention for returning.
   今天早上在整理代碼的時候發現瞭如上警告。
   在網上查詢後發現，是因爲蘋果在新的編碼，不推薦變量以new、copy等關鍵字開頭。
   突然想起來之前也有朋友問過類似的問題。特做以記錄。
   也希望大家在以後編碼的時候，能夠多多注意。
   
   
6. 快速獲取沙盒路徑
   #define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
   
   
7. 判斷郵箱是否合法
   

   - (BOOL) validateEmail: (NSString *) candidate {
   NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}"; 
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 
   return [emailTest evaluateWithObject:candidate];
   }

8. 顯示網絡活動狀態 
   

   UIApplication* app = [UIApplication sharedApplication];
   app.networkActivityIndicatorVisible = YES; // to stop it, set this to NO

   
   
   
9. 顯示一組連續的圖片（類似動畫效果）
   

   NSArray *myImages = [NSArray arrayWithObjects:
       [UIImage imageNamed:@"myImage1.png"],
       [UIImage imageNamed:@"myImage2.png"],
       [UIImage imageNamed:@"myImage3.png"],
       [UIImage imageNamed:@"myImage4.gif"],
       nil];
   
   UIImageView *myAnimatedView = [UIImageView alloc];
   [myAnimatedView initWithFrame:[self bounds]];
   myAnimatedView.animationImages = myImages;
   myAnimatedView.animationDuration = 0.25; // seconds
   myAnimatedView.animationRepeatCount = 0; // 0 = loops forever
   [myAnimatedView startAnimating];
   [self addSubview:myAnimatedView];
   [myAnimatedView release];

   
   
   
10. 頁面切換效果設置
    controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self presentModalViewController:controller animated:YES];
    
    
    可供使用的效果：
    UIModalTransitionStyleCoverVertical
    UIModalTransitionStyleFlipHorizontal
    UIModalTransitionStyleCrossDissolve
    UIModalTransitionStylePartialCurl
    
    
    恢復之前的頁面：
    [self dismissModalViewControllerAnimated:YES];
    
    
11. 爲UIImageView添加單擊事件：
    

    imageView.userInteractionEnabled = YES;
    
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourHandlingCode:)];
    
    [imageView addGestureRecognizer:singleTap];

    
    
12. 獲取應用版本
    
    

    NSDictionary* infoDict =[[NSBundle mainBundle] infoDictionary];
    NSString* versionNum =[infoDict objectForKey:@"CFBundleVersion"];
    NSString*appName =[infoDict objectForKey:@"CFBundleDisplayName"];