iOS UIButton文字与图片位置的设置

• UIButton默认，图片居左，文字在右，垂直居中显示，文字与图片没有间距，如下图：

可以通过设置UIButton中的titleEdgeInsets和imageEdgeInsets改变按钮的imageView与titleLabel的位置与间距，推荐给UIButton添加一个分类，将一下方法公开出来，方便所有的按钮调用

github Demo下载地址：https://github.com/yanhaiqiang/HQIconButton

1.图片居左，文字在右，垂直居中显示，文字与图片没有间距为10，如下图：

代码如下：

- (void)setIconInLeftWithSpacing:(CGFloat)Spacing
{
    self.titleEdgeInsets = (UIEdgeInsets){
        .top    = 0,
        .left   = Spacing/2,
        .bottom = 0,
        .right  = -Spacing/2,
    };
    
    self.imageEdgeInsets = (UIEdgeInsets){
        .top    = 0,
        .left   = -Spacing/2,
        .bottom = 0,
        .right  = Spacing/2,
    };
}

2.图片居右，文字在左，垂直居中显示，文字与图片没有间距为10，如下图：

代码如下：

- (void)setIconInRightWithSpacing:(CGFloat)Spacing
{    
    CGFloat img_W = self.imageView.frame.size.width;
    CGFloat tit_W = self.titleLabel.frame.size.width;
    
    self.titleEdgeInsets = (UIEdgeInsets){
        .top    = 0,
        .left   = - (img_W + Spacing / 2),
        .bottom = 0,
        .right  =   (img_W + Spacing / 2),
    };
    
    self.imageEdgeInsets = (UIEdgeInsets){
        .top    = 0,
        .left   =   (tit_W + Spacing / 2),
        .bottom = 0,
        .right  = - (tit_W + Spacing / 2),
    };
}

3.图片居上，文字在下，垂直居中显示，文字与图片没有间距为10，如下图：

代码如下：

- (void)setIconInTopWithSpacing:(CGFloat)Spacing
{
    CGFloat img_W = self.imageView.frame.size.width;
    CGFloat img_H = self.imageView.frame.size.height;
    CGFloat tit_W = self.titleLabel.frame.size.width;
    CGFloat tit_H = self.titleLabel.frame.size.height;
    
    self.titleEdgeInsets = (UIEdgeInsets){
        .top    =   (tit_H / 2 + Spacing / 2),
        .left   = - (img_W / 2),
        .bottom = - (tit_H / 2 + Spacing / 2),
        .right  =   (img_W / 2),
    };
    
    self.imageEdgeInsets = (UIEdgeInsets){
        .top    = - (img_H / 2 + Spacing / 2),
        .left   =   (tit_W / 2),
        .bottom =   (img_H / 2 + Spacing / 2),
        .right  = - (tit_W / 2),
    };
}

4.图片居下，文字在上，垂直居中显示，文字与图片没有间距为10，如下图：

代码如下：

- (void)setIconInBottomWithSpacing:(CGFloat)Spacing
{
    CGFloat img_W = self.imageView.frame.size.width;
    CGFloat img_H = self.imageView.frame.size.height;
    CGFloat tit_W = self.titleLabel.frame.size.width;
    CGFloat tit_H = self.titleLabel.frame.size.height;
    
    self.titleEdgeInsets = (UIEdgeInsets){
        .top    = - (tit_H / 2 + Spacing / 2),
        .left   = - (img_W / 2),
        .bottom =   (tit_H / 2 + Spacing / 2),
        .right  =   (img_W / 2),
    };
    
    self.imageEdgeInsets = (UIEdgeInsets){
        .top    =   (img_H / 2 + Spacing / 2),
        .left   =   (tit_W / 2),
        .bottom = - (img_H / 2 + Spacing / 2),
        .right  = - (tit_W / 2),
    };
}