iOS - UIButton设置图片文字上图下文排列

经查阅资料及尝试，最终解决了在图片和文字垂直排列的情况下，如果文字长度变化会导致图片位置变动的问题，最开始采用了网上比较多的做法，做法如下：

@interface UIButton (UIButtonExt)
- (void)centerImageAndTitle:(float)space;
- (void)centerImageAndTitle;
@end  

@implementation UIButton (UIButtonExt)
- (void)centerImageAndTitle:(float)spacing
{
    // get the size of the elements here for readability
    CGSize imageSize = self.imageView.frame.size;
    CGSize titleSize = self.titleLabel.frame.size;  

    // get the height they will take up as a unit
    CGFloat totalHeight = (imageSize.height + titleSize.height + spacing);  

    // raise the image and push it right to center it
    self.imageEdgeInsets = UIEdgeInsetsMake(- (totalHeight - imageSize.height), 0.0, 0.0, - titleSize.width);  

    // lower the text and push it left to center it
    self.titleEdgeInsets = UIEdgeInsetsMake(0.0, - imageSize.width, - (totalHeight - titleSize.height),0.0);
}  

- (void)centerImageAndTitle
{
    const int DEFAULT_SPACING = 6.0f;
    [self centerImageAndTitle:DEFAULT_SPACING];
 }
@end

后面经过测试，如果button的文字长度变更，会导致图片位置变化，经过多次修改UIEdgeInsets的值也没有达到期望效果，最终采用集成UIButton类，重写layoutSubviews函数实现，特将成果记录一下，以便后续查阅

-(void)layoutSubviews {
    [super layoutSubviews];

    // Center image
    CGPoint center = self.imageView.center;
    center.x = self.frame.size.width/;
    center.y = self.imageView.frame.size.height/;
    self.imageView.center = center;

    //Center text
    CGRect newFrame = [self titleLabel].frame;
    newFrame.origin.x = ;
    newFrame.origin.y = self.imageView.frame.size.height + ;
    newFrame.size.width = self.frame.size.width;

    self.titleLabel.frame = newFrame;
    self.titleLabel.textAlignment = UITextAlignmentCenter;
}

通过重写，重新设置imageView的Center和titleLabel的Frame解决上述问题。