ios图片拉伸两种方法

UIImage *image = [UIImage imageNamed:@"QQ"];

第一种：

//左端盖宽度NSInteger leftCapWidth = image.size.width *0.5f;//顶端盖高度NSInteger topCapHeight = image.size.height *0.5f;//重新赋值image = [image stretchableImageWithLeftCapWidth:leftCapWidth topCapHeight:topCapHeight];

第二种：

CGFloat top =25;//顶端盖高度CGFloat bottom =25;//底端盖高度CGFloat left =10;//左端盖宽度CGFloat right =10;//右端盖宽度UIEdgeInsets insets =UIEdgeInsetsMake(top, left, bottom, right);//指定为拉伸模式，伸缩后重新赋值image = [image resizableImageWithCapInsets:insets resizingMode:UIImageResizingModeStretch];

补：UIButton加载图片：

[button setBackgroundImage:image forState:UIControlStateNormal];

原图：