iOS 開發中的幾個小知識點

《iOS遊戲編程之從零開始-Cocos2dx與cocos2d引擎開發》這本數確實很適合初學者使用。裡邊的知識由簡入深，給零基礎iOS開發人員做了細緻而深入的講解。我將iOS開發中的一些小知識和大家分享分享吧。

1、壓縮圖片：UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0,
210.0)];

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize  {      // Create a graphics image context      UIGraphicsBeginImageContext(newSize);            // Tell the old image to draw in this newcontext, with the desired      // new size      [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];            // Get the new image from the context      UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();            // End the context      UIGraphicsEndImageContext();            // Return the new image.      return newImage;  }  

2、URL編碼

NSString * encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes  (NULL, (CFStringRef)yourtext, NULL,   (CFStringRef)@”!*’();:@&=+$,/?%#[]“, kCFStringEncodingUTF8);

3、設定navigationBar隱藏

self.navigationController.navigationBarHidden = YES;

4、imageView載入圖片

UIImage *myImage = [UIImage imageNamed:@"1.jpg"];  [imageView setImage:myImage];  [self.view addSubview:imageView]; 

5、停止UIView動畫的方法

#import<QuartzCore/QuartzCore.h>[self.view.layer removeAllAnimations];

6、通過tag取cell上的控制項

[cell.contentView viewWithTag:tag];