之前介绍过通过 stretchableImageWithLeftCapWidth:topCapHeight: 方法来实现可伸缩图片；

可看这篇随笔：

 

iOS5 中提供了一个新的 UIImage 对象实例方法：resizableImageWithCapInsets:，可以将图片转换为以某一偏移值为偏移的可伸缩图片（偏移值内的图片内容将不被拉伸或压缩）。

stretchableImageWithLeftCapWidth:topCapHeight: 模式（此方法已经过期，推荐用下面的resizableImageWithCapInsets: 方法）；

resizableImageWithCapInsets: 模式还能实现类似图片渐变的效果，更灵活控制。

 

效果如下：

ViewController.h

1 #import 
     
      2 3 @interface ViewController : UIViewController4 @end
     

ViewController.m

1 #import "ViewController.h" 2  3 @interface ViewController () 4 - (void)layoutUI; 5 @end 6  7 @implementation ViewController 8 #define kWidthOfButton 160.0 9 #define kHeightOfButton 49.010 11 - (void)viewDidLoad {12     [super viewDidLoad];13     14     [self layoutUI];15 }16 17 - (void)didReceiveMemoryWarning {18     [super didReceiveMemoryWarning];19     // Dispose of any resources that can be recreated.20 }21 22 - (void)layoutUI {23     //普通模式24     UIImage *img = [UIImage imageNamed:@"blueButton"]; //size: 39*3925     UIButton *btnNormal = [[UIButton alloc] initWithFrame:CGRectMake(20.0, 40.0, kWidthOfButton, kHeightOfButton)];26     [btnNormal setTitle:@"btnNormal" forState:UIControlStateNormal];27     [btnNormal setBackgroundImage:img forState:UIControlStateNormal];28     [self.view addSubview:btnNormal];29     30     //stretchableImageWithLeftCapWidth:topCapHeight:模式（此方法已经过期，推荐用下面的resizableImageWithCapInsets:方法）31     UIImage *imgStretchable = [img stretchableImageWithLeftCapWidth:16.0 topCapHeight:16.0];32     UIButton *btnStretchable = [[UIButton alloc] initWithFrame:CGRectMake(20.0, 50.0+kHeightOfButton, kWidthOfButton, kHeightOfButton)];33     [btnStretchable setTitle:@"btnStretchable" forState:UIControlStateNormal];34     [btnStretchable setBackgroundImage:imgStretchable forState:UIControlStateNormal];35     [self.view addSubview:btnStretchable];36     37     //resizableImageWithCapInsets:模式；相比stretchableImageWithLeftCapWidth:topCapHeight:模式来说，resizableImageWithCapInsets:模式还能实现类似图片渐变的效果，更灵活控制38     UIImage *imgResizable = [img resizableImageWithCapInsets:UIEdgeInsetsMake(30.0, 16.0, 9.0, 16.0)];39     UIButton *btnResizable = [[UIButton alloc] initWithFrame:CGRectMake(20.0, 60.0+(kHeightOfButton*2), kWidthOfButton, kHeightOfButton)];40     [btnResizable setTitle:@"btnResizable" forState:UIControlStateNormal];41     [btnResizable setBackgroundImage:imgResizable forState:UIControlStateNormal];42     [self.view addSubview:btnResizable];43 }44 45 @end