iOS 图片的截取

iOS 图片的截取

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];
 }