将UIButton文字置于图标正下方

/**
 *    将文字放在图片之下
 */
- (void)textUnderImageButton:(UIButton *)button
{
    // the space between the image and text
    CGFloat spacing = 6.0;
    
    // lower the text and push it left so it appears centered below the image
    CGSize imageSize = button.imageView.image.size;
    button.titleEdgeInsets = UIEdgeInsetsMake(0.0, - imageSize.width, - (imageSize.height + spacing), 0.0);
    
    // raise the image and push it right so it appears centered above the text
    CGSize titleSize = [button.titleLabel.text sizeWithAttributes:@{NSFontAttributeName: button.titleLabel.font}];
    button.imageEdgeInsets = UIEdgeInsetsMake(- (titleSize.height + spacing), 0.0, 0.0, - titleSize.width);
}