知识点回顾-图片拉伸保持不变形

 1 1.
 2 // 1.创建个图片对象
 3     UIImage *image = [UIImage imageNamed:@"buttongreen"];
 4 
 5     // 2.根据图片创建一个可以拉伸的图片
 6     image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
 7 
 8     [self.btn setBackgroundImage:image forState:UIControlStateNormal];
 9 
10 2.
11 
12     // 1.创建个图片对象
13     UIImage *image = [UIImage imageNamed:@"chat"];
14 
15     // 2.获得可拉伸的区域
16     CGFloat imageW = image.size.width;
17     CGFloat imageH = image.size.height;
18     // 3.根据图片创建一个可以拉伸的图片
19     image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeTile];
20     [self.btn setBackgroundImage:image forState:UIControlStateNormal];