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iOS 图片的截取第一种：整个屏幕截取
 
在ViewController中写的，这个类是一个视图控制器
 -（void）loadView{
 
 //静态方法sharedApplication
   [[UIApplication sharedApplication]setStatusBarHidden:YES //把状态栏隐藏
                                            withAnimation:UIStatusBarAnimationSlide];
   UIImage *mage=[UIImage imageNamed:@"image.png"];
   UIImageView *imageView=[[UIImageView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]];
 
    //UIImageView *im=[UIImageView alloc]initWithImage:mage];
   [imageView setImage:mage];
   
   self.view=[[UIView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]];
                [self.view addSubview:contentView];
   CGRect rect=CGRectMake（0, 0, 320, 480）;
   UIGraphicsBeginImageContext（rect.size）;
   CGContextRef currentContext=UIGraphicsGetCurrentContext（）;
   CGContextClipToRect（currentContext,rect）;
   CGContextDrawImage（currentContext, rect, mage.CGImage）;
   UIImage *image=UIGraphicsGetImageFromCurrentImageContext（）;
   UIGraphicsEndImageContext（）;
   contentView.image=image;
   self.view=[[UIView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]];
   [self.view addSubview:contentView];
   [image release];
   
 } 第二种：整张图片的缩略
 
-（void）loadView{
   [[UIApplication sharedApplication]setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
   UIImage *image=[UIImage imageNamed:@"image.png"];
    //UIImageView *contentView=[[UIImageView alloc]initWithFrame:[[UIScreen mainScreen] applicationFrame]];
 
    //用来控制图片缩到多大
   CGRect rect=CGRectMake（0, 0, 160, 240）;
   UIGraphicsBeginImageContext（rect.size）;
   CGContextRef currentContent=UIGraphicsGetCurrentContext（）;
   CGContextClipToRect（currentContent, rect）;
   [image drawInRect:rect];
   UIImage *image=UIGraphicsGetImageFromCurrentImageContext（）;
   UIGraphicsEndImageContext（）;
   UIImageView *contentView=[[UIImageView alloc]initWithFrame:rect];
   contentView.image=image;
   self.view=[[UIView alloc]initWithFrame:[[UIScreen mainScreen]applicationFrame]];
   [self.view addSubview:contentView];
   
   [image release];
 }