iOS·UIButton如何文字在下图片在上

 1 -(void)layoutSubviews {
 2     [super layoutSubviews];
 3     
 4     // image center
 5     CGPoint center;
 6     center.x = self.frame.size.width/2;
 7     center.y = self.imageView.frame.size.height/2;
 8     self.imageView.center = center;
 9     
10     //text
11     CGRect newFrame = [self titleLabel].frame;
12     newFrame.origin.x = 0;
13     newFrame.origin.y = self.imageView.frame.size.height + 5;
14     newFrame.size.width = self.frame.size.width;
15     
16     self.titleLabel.frame = newFrame;
17     self.titleLabel.textAlignment = NSTextAlignmentCenter;
18 }