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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
UIImage
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原文地址：http://www.cnblogs.com/hangman/p/5463874.html
