iOS-如何调整UIButton子视图的位置

以下代码是笔者再工作中总结得来的，如果错误，请多多指教！
给按钮创建个分类UIButton+EdgeInsets,然后将代码拷贝到对应文件即可

• UIButton+EdgeInsets.h文件

/**
 图片在左，文字在右
 
 @param space 图片和文字的间隔
 */
- (void)imageOnLeftWithSpace:(CGFloat)space;

/**
 图片在右，文字在左
 
 @param space 图片和文字的间隔
 */
- (void)imageOnRightWithSpace:(CGFloat)space;

/**
 图片在上，文字在下
 
 @param space 图片和文字的间隔
 */
- (void)imageOnTopWithSpace:(CGFloat)space;

/**
 图片在下，文字在上

 @param space 图片和文字的间隔
 */
- (void)imageOnBottomWithSpace:(CGFloat)space;

/**
 用于有图片有文字的按钮。
 功能：设置图片和文字之间的间距，并且可设置内容距离父视图左边的间距

 @param space1 图片和文字之家的间距
 @param space2 内容距离父视图左边的间距
 */
- (void)imageOnLeftWithSpace:(CGFloat)space1 contentLeftSpace:(CGFloat)space2;

• UIButton+EdgeInsets.m文件

- (void)imageOnLeftWithSpace:(CGFloat)space
{
    [self layoutIfNeeded];
    
    self.titleEdgeInsets
    = UIEdgeInsetsMake(
                       0,// top
                       space * 0.5,// left
                       0,// bottom
                       - space * 0.5);// right
    
    self.imageEdgeInsets
    = UIEdgeInsetsMake(
                       0,// top
                       - space * 0.5,// left
                       0,// bottom
                       space * 0.5);// right
}

- (void)imageOnRightWithSpace:(CGFloat)space
{
    [self layoutIfNeeded];
    
    self.titleEdgeInsets
    = UIEdgeInsetsMake(0,// top
                       - self.imageView.bounds.size.width - space * 0.5,// left
                       0,// bottom
                       self.imageView.bounds.size.width + space * 0.5);// right
    self.imageEdgeInsets
    = UIEdgeInsetsMake(0,// top
                       self.titleLabel.bounds.size.width + space * 0.5,// left
                       0,// bottom
                       - self.titleLabel.bounds.size.width - space * 0.5);// right
}

- (void)imageOnTopWithSpace:(CGFloat)space
{
    [self layoutIfNeeded];
    
    BOOL holisticUpMove = self.titleLabel.bounds.size.height > self.imageView.bounds.size.height;
    
    CGFloat offset = fabs(self.imageView.bounds.size.height - self.titleLabel.bounds.size.height) / 2;
    
    CGFloat imageTop = 0;
    CGFloat imageLeft = 0;
    CGFloat imageBottom = 0;
    CGFloat imageRight = 0;
    
    if (holisticUpMove) {
        // 整体上移
        imageTop = -self.imageView.bounds.size.height * 0.5 - offset - space * 0.5;
        imageLeft = self.titleLabel.bounds.size.width * 0.5;
        imageBottom = self.imageView.bounds.size.height * 0.5 + offset + space * 0.5;
        imageRight = - self.titleLabel.bounds.size.width * 0.5;
    }else {
        // 整体下移
        imageTop = -self.imageView.bounds.size.height * 0.5 + offset - space * 0.5;
        imageLeft = self.titleLabel.bounds.size.width * 0.5;
        imageBottom = self.imageView.bounds.size.height * 0.5 - offset + space * 0.5;
        imageRight = - self.titleLabel.bounds.size.width * 0.5;
    }
    
    self.imageEdgeInsets
    = UIEdgeInsetsMake(
                       imageTop,// top
                       imageLeft,// left
                       imageBottom,// bottom
                       imageRight);// right
    
    CGFloat labelTop = 0;
    CGFloat labelLeft = 0;
    CGFloat labelBottom = 0;
    CGFloat labelRight = 0;
    
    if (holisticUpMove) {
        // 整体上移
        labelTop = self.titleLabel.bounds.size.height * 0.5 - offset + space * 0.5;
        labelLeft = - self.imageView.bounds.size.width * 0.5;
        labelBottom = -self.titleLabel.bounds.size.height * 0.5 + offset - space * 0.5;
        labelRight = self.imageView.bounds.size.width * 0.5;
    }else {
        // 整体下移
        labelTop = self.titleLabel.bounds.size.height * 0.5 + offset + space * 0.5;
        labelLeft = - self.imageView.bounds.size.width * 0.5;
        labelBottom = -self.titleLabel.bounds.size.height * 0.5 - offset - space * 0.5;
        labelRight = self.imageView.bounds.size.width * 0.5;
    }
    
    self.titleEdgeInsets
    = UIEdgeInsetsMake(
                       labelTop,// top
                       labelLeft,// left
                       labelBottom,// bottom
                       labelRight);// right
}

- (void)imageOnBottomWithSpace:(CGFloat)space
{
    [self layoutIfNeeded];
    
    BOOL holisticUpMove = self.imageView.bounds.size.height > self.titleLabel.bounds.size.height;
    
    CGFloat offset = fabs(self.imageView.bounds.size.height - self.titleLabel.bounds.size.height) / 2;
    
    CGFloat imageTop = 0;
    CGFloat imageLeft = 0;
    CGFloat imageBottom = 0;
    CGFloat imageRight = 0;
    
    if (holisticUpMove) {
        // 整体需要上移
        imageTop = self.imageView.bounds.size.height * 0.5 - offset + space * 0.5;
        imageLeft = self.titleLabel.bounds.size.width * 0.5;
        imageBottom = - self.imageView.bounds.size.height * 0.5 + offset - space * 0.5;
        imageRight = - self.titleLabel.bounds.size.width * 0.5;
    }else {
        // 整体需要下移
        imageTop = self.imageView.bounds.size.height * 0.5 + offset + space * 0.5;
        imageLeft = self.titleLabel.bounds.size.width * 0.5;
        imageBottom = - self.imageView.bounds.size.height * 0.5 - offset - space * 0.5;
        imageRight = - self.titleLabel.bounds.size.width * 0.5;
    }
    
    self.imageEdgeInsets
    = UIEdgeInsetsMake(
                       imageTop,// top
                       imageLeft,// left
                       imageBottom,// bottom
                       imageRight);// right
    
    CGFloat labelTop = 0;
    CGFloat labelLeft = 0;
    CGFloat labelBottom = 0;
    CGFloat labelRight = 0;
    if (holisticUpMove) {
        // 整体上移
        labelTop = - self.titleLabel.bounds.size.height * 0.5 - offset - space * 0.5;
        labelLeft = - self.imageView.bounds.size.width * 0.5;
        labelBottom = self.titleLabel.bounds.size.height * 0.5 + offset + space * 0.5;
        labelRight = self.imageView.bounds.size.width * 0.5;
    }else {
        // 整体下移
        labelTop = - self.titleLabel.bounds.size.height * 0.5 + offset - space * 0.5;
        labelLeft = - self.imageView.bounds.size.width * 0.5;
        labelBottom = self.titleLabel.bounds.size.height * 0.5 - offset + space * 0.5;
        labelRight = self.imageView.bounds.size.width * 0.5;
    }
    
    self.titleEdgeInsets
    = UIEdgeInsetsMake(
                       labelTop,// top
                       labelLeft,// left
                       labelBottom,// bottom
                       labelRight);// right
}

- (void)imageOnLeftWithSpace:(CGFloat)space1 contentLeftSpace:(CGFloat)space2
{
    [self imageOnLeftWithSpace:space1];
    CGFloat insetLeft = self.imageView.frame.origin.x - space2;
    self.contentEdgeInsets = UIEdgeInsetsMake(0, - insetLeft, 0, insetLeft);
}