怎样改变 unbutton 的title 和image 的位子

.继承自UIButton

2.重写这两个方法:

-(CGRect)titleRectForContentRect:(CGRect)contentRect {     CGFloat titleY = contentRect.size.height *0.6;     CGFloat titleW = contentRect.size.width;     CGFloat titleH = contentRect.size.height - titleY;     return CGRectMake(0, titleY, titleW, titleH); } -(CGRect)imageRectForContentRect:(CGRect)contentRect {     CGFloat imageW = CGRectGetWidth(contentRect);      CGFloat imageH = contentRect.size.height * 0.6;      return CGRectMake(0, 0, imageW, imageH); }