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：/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),};}
