.h中定义方法

@interface UIButton (CustomButton)

/** 图片在左，标题在右 */
- (void)setIconInLeft;
/** 图片在右，标题在左 */
- (void)setIconInRight;
/** 图片在上，标题在下 */
- (void)setIconInTop;
/** 图片在下，标题在上 */
- (void)setIconInBottom;

//** 可以自定义图片和标题间的间隔 */
- (void)setIconInLeftWithSpacing:(CGFloat)Spacing;
- (void)setIconInRightWithSpacing:(CGFloat)Spacing;
- (void)setIconInTopWithSpacing:(CGFloat)Spacing;
- (void)setIconInBottomWithSpacing:(CGFloat)Spacing;

@end

.m中实现方法

#import "UIButton+CustomIcon.h"

@implementation UIButton (CustomButton)

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

- (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),
    };
}

- (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),
    };
}

- (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),
    };
}

- (void)setIconInLeft
{
    [self setIconInLeftWithSpacing:0];
}

- (void)setIconInRight
{
    [self setIconInRightWithSpacing:0];
}

- (void)setIconInTop
{
    [self setIconInTopWithSpacing:0];
}

- (void)setIconInBottom
{
    [self setIconInBottomWithSpacing:0];
}
@end