ios图片拉伸解决办法

转载自： http://code4app.com/snippets/one/ios%E5%9B%BE%E7%89%87%E6%8B%89%E4%BC%B8%E8%A7%A3%E5%86%B3%E5%8A%9E%E6%B3%95/53730ed3933bf0b91e8b51b4#s0

这个方法可以使图片两端不拉伸，中间拉伸。解决图片拉伸变形问题,设置之后无论把image放到什么控件中都可以自动拉伸了

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UIImage*image = [UIImageimageNamed:@"ReceiverTextNodeBkg"];

image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width/2)topCapHeight:floorf(image.size.height/2)];