UIImageView常用操作

    UIImage* image = [UIImage imageNamed:@"back2.jpg"];   
    UIImageView* imageView1 = [[[UIImageView alloc] initWithImage:image] autorelease];   
    imageView1.frame = CGRectMake(0, 0, 300, 200);   
    imageView1.center = CGPointMake(150, 200);
    //设置圆角
    imageView1.layer.cornerRadius = 8;  
    imageView1.layer.masksToBounds = YES; 
    
    //自适应图片宽高比例
    imageView1.contentMode = UIViewContentModeScaleAspectFit;  
    [self.view addSubview:imageView1];  
    
    
    //拉伸图片
    CGFloat capWidth = image.size.width / 2;  
    CGFloat capHeight = image.size.height / 2;  
    UIImage* stretchableImage = [image stretchableImageWithLeftCapWidth:capWidth topCapHeight:capHeight];
    UIImageView* imageView3 = [[[UIImageView alloc] initWithImage:stretchableImage] autorelease];
    imageView3.frame = CGRectMake(0, 0, 300, 200);   
    imageView3.center = CGPointMake(150, 200);  
    [self.view addSubview:imageView3]; 
    
    //改变frame改变
    UIImageView* imageView4 = [[[UIImageView alloc] initWithImage:image] autorelease];
    imageView4.frame = CGRectMake(0, 0, 300/2, 200/2);   
    imageView4.center = CGPointMake(150, 200);  
    [self.view addSubview:imageView4]; 
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