UIImage

 UIImage *image = [UIImage imageNamed:@"message_i"];
//对图片进行切分
    image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(16, 16, 16, 30) resizingMode:UIImageResizingModeStretch];

    _imageView.image = image

 

// [self setClipsToBounds:YES];
        if ([[[UIDevice currentDevice]systemVersion] floatValue] >=6) {
            [[UITabBar appearance] setShadowImage:[[UIImage alloc]init] ]; 去掉tabor 的阴影线

        }

 

 

 

UIImage *image = [UIImageimageNamed:@"icon80"];

//以下两行代码可以省略不写...
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(10, 10, 80, 80)];
//按照path勾勒的路径，将该区域以外的部分设置为绘制无效区域
    [path addClip];
//以上两行代码可以省略不写...

    [image drawInRect:CGRectMake(10, 10, 80, 80)];

<code class="hljs" objectivec="">    self.view.backgroundColor = [UIColor darkGrayColor];

 

    //不设置拉伸点，直接设置

    UIImage *image1 = [UIImage imageNamed:@QQ];

    UIImageView *imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(10, 100, 170, 170)];

    imageView1.image = image1;

    [self.view addSubview:imageView1];

 

    //设置拉伸点，对左边和上面分开设置，理解其拉伸效果

    UIImage *image2 = [UIImage imageNamed:@QQ];

    image2 = [image2 stretchableImageWithLeftCapWidth:0 topCapHeight:image2.size.height*0.5];

    UIImageView *imageView2 = [[UIImageView alloc] initWithFrame:CGRectMake(190, 100, 170, 170)];

    imageView2.image = image2;

 

    [self.view addSubview:imageView2];</code>

 

 

 

<code class="hljs" objectivec="">    //不设置拉伸点，直接设置

    UIImage *image1 = [UIImage imageNamed:@chat];

    UIImageView *imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 80)];

    imageView1.image = image1;

    [self.view addSubview:imageView1];

    //设置拉伸点

    UIImage *image2 = [UIImage imageNamed:@chat];

    image2 = [image2 stretchableImageWithLeftCapWidth:image2.size.width*0.5 topCapHeight:image2.size.width*0.8];

    UIImageView *imageView2 = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 200, 80)];

    imageView2.image = image2;

    [self.view addSubview:imageView2];</code>

 

 

 

IImage * image =[[UIImage imageNamed:@"anim_loading_01"] stretchableImageWithLeftCapWidth:3.4 topCapHeight:23.0];

 

stretchableImageWithLeftCapWidth:3.4 topCapHeight:23.0

stretchableImageWithLeftCapWidth:表示横向拉伸 0 表示不拉伸

topCapHeight:表示竖向拉伸 0 表示不来伸