ios图片拉伸解决办法

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)];