如何在按钮中把文字放左边，图片放右边自定义LFBuybutton ，继承自UIbutton，在自定义的按钮中重写方法-(void)layoutSubviews 
根据文字和按钮的X点的交换，实现文字和图片位置的交换?

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#import "LFBuybutton.h" @implementation LFBuybutton   -(void)layoutSubviews{    [super layoutSubviews];         CGRect titleF = self.titleLabel.frame;    CGRect imageF = self.imageView.frame;         titleF.origin.x = imageF.origin.x;    self.titleLabel.frame = titleF;    imageF.origin.x = CGRectGetMaxX(titleF);    self.imageView.frame = imageF;     } @end

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