UIButton 图片和文字上下排列

新建一个UIButton 类 重写layoutSubviews方法

-(void)layoutSubviews{    // Center image    [superlayoutSubviews];    CGPoint center =self.imageView.center;    center.x =self.frame.size.width/2;    center.y =self.imageView.frame.size.height/2+5;    self.imageView.center = center;    //Center text    CGRect newFrame = [selftitleLabel].frame;    newFrame.origin.x =0;    newFrame.origin.y =self.imageView.frame.size.height;    newFrame.size.width =self.frame.size.width;    self.titleLabel.frame = newFrame;    self.titleLabel.textAlignment =NSTextAlignmentCenter;   }