Button上icon加文字

我们常常需要做一个button上面既有icon又有文字。也许左icon右文字，或者上icon下文字。UIButton并没有提供直接这样排布的功能，大家可能也能用

• 添加一个UIButton的 category
  .h文件

  - (void)titleImageHorizontalAlignmentWithSpace:(float)space;
  - (void)imageTitleHorizontalAlignmentWithSpace:(float)space;
  - (void)titleImageVerticalAlignmentWithSpace:(float)space;
  - (void)imageTitleVerticalAlignmentWithSpace:(float)space;
  

• .m 文件

  - (void)titleImageHorizontalAlignmentWithSpace:(float)space;
  {
    [self resetEdgeInsets];
    [self setNeedsLayout];
    [self layoutIfNeeded];
  
    CGRect contentRect = [self contentRectForBounds:self.bounds];
    CGSize titleSize = [self titleRectForContentRect:contentRect].size;
    CGSize imageSize = [self imageRectForContentRect:contentRect].size;
  
    [self setContentEdgeInsets:UIEdgeInsetsMake(0, 0, 0, space)];
    [self setTitleEdgeInsets:UIEdgeInsetsMake(0, -imageSize.width, 0, imageSize.width)];
    [self setImageEdgeInsets:UIEdgeInsetsMake(0, titleSize.width+space, 0, -titleSize.width - space)];
  }
  
  - (void)imageTitleHorizontalAlignmentWithSpace:(float)space;
  {
    [self resetEdgeInsets];
    [self setTitleEdgeInsets:UIEdgeInsetsMake(0, space, 0, -space)];
    [self setContentEdgeInsets:UIEdgeInsetsMake(0, 0, 0, space)];
  }
  
  - (void)titleImageVerticalAlignmentWithSpace:(float)space;
  {
    [self verticalAlignmentWithTitleTop:YES space:space];
  }
  
  - (void)imageTitleVerticalAlignmentWithSpace:(float)space;
  {
      [self verticalAlignmentWithTitleTop:NO space:space];
  }
  
  - (void)verticalAlignmentWithTitleTop:(BOOL)isTop space:(float)space ;
  {
      [self resetEdgeInsets];
      [self setNeedsLayout];
      [self layoutIfNeeded];
  
      CGRect contentRect = [self contentRectForBounds:self.bounds];
      CGSize titleSize = [self titleRectForContentRect:contentRect].size;
      CGSize imageSize = [self imageRectForContentRect:contentRect].size;
  
      float halfWidth = (titleSize.width + imageSize.width)/2;
      float halfHeight = (titleSize.height + imageSize.height)/2;
  
      float topInset = MIN(halfHeight, titleSize.height);
      float leftInset = (titleSize.width - imageSize.width)>0?(titleSize.width - imageSize.width)/2:0;
      float bottomInset = (titleSize.height - imageSize.height)>0?(titleSize.height - imageSize.height)/2:0;
      float rightInset = MIN(halfWidth, titleSize.width);
  
      if (isTop) {
        [self setTitleEdgeInsets:UIEdgeInsetsMake(-titleSize.height-space, - halfWidth, imageSize.height+space, halfWidth)];
        [self setContentEdgeInsets:UIEdgeInsetsMake(topInset+space, leftInset, -bottomInset, -rightInset)];
    } else {
    [self setTitleEdgeInsets:UIEdgeInsetsMake(imageSize.height+space, - halfWidth, -titleSize.height-space, halfWidth)];
    [self setContentEdgeInsets:UIEdgeInsetsMake(-bottomInset, leftInset, topInset+space, -rightInset)];
    }
  }
  
  - (void)resetEdgeInsets
  {
    [self setContentEdgeInsets:UIEdgeInsetsZero];
    [self setImageEdgeInsets:UIEdgeInsetsZero];
    [self setTitleEdgeInsets:UIEdgeInsetsZero];
  }