###图片拉伸 ####1.第一种图形界面 ######第三步 图形设置只需要点点就行，至于拉伸大小，系统已替你算好 ####2.代码方式

• 第一种

  UIImageView *imageView=[[UIImageView alloc]init]; UIImage *image=[UIImage imageNamed:@"chat_send_nor"]; image=[image resizableImageWithCapInsets:UIEdgeInsetsMake(30, 30, 30, 30) resizingMode:UIImageResizingModeTile]; imageView.image=image; imageView.frame=CGRectMake(30, 50, 200, 200); [self.view addSubview:imageView];

• 第二种

  UIImageView *imageView=[[UIImageView alloc]init];UIImage *image=[UIImage imageNamed:@"chat_send_nor"];

// image=[image resizableImageWithCapInsets:UIEdgeInsetsMake(30, 30, 30, 30) resizingMode:UIImageResizingModeTile]; image=[image stretchableImageWithLeftCapWidth:image.size.width*0.5 topCapHeight:image.size.height]; imageView.image=image; imageView.frame=CGRectMake(30, 50, 200, 200); [self.view addSubview:imageView];

//    - (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight __TVOS_PROHIBITED;//    @property(nonatomic,readonly) NSInteger leftCapWidth __TVOS_PROHIBITED;   // default is 0. if non-zero, horiz. stretchable. right cap is calculated as width - leftCapWidth - 1//    @property(nonatomic,readonly) NSInteger topCapHeight __TVOS_PROHIBITED;   // default is 0. if non-zero, vert. stretchable. bottom cap is calculated as height - topCapWidth - 1////实际就是1，也是图形与图形界面一样的结果// right = width - left - 1;// 1 = width - left - right;// bottom = height - top - 1;// 1 = height - top - bottom;//可以将其封装成一个uiimage的分类，这样可以重用```

####3.github地址