.h文件

// 定义一个枚举（包含了四种类型的button）
typedef NS_ENUM(NSInteger, ButtonImageEdgeInsetsStyle) {
    /**
     *  image在上，label在下
     */
    ButtonImageEdgeInsetsStyleTop,
    /**
     *  image在左，label在右
     */
    ButtonImageEdgeInsetsStyleLeft,
    /**
     *  image在下，label在上
     */
    ButtonImageEdgeInsetsStyleBottom,
    /**
     *  image在右，label在左
     */
    ButtonImageEdgeInsetsStyleRight
};

#import <UIKit/UIKit.h>

@interface UIButton (MaxMethod)

/**
 * 设置button的titleLabel和imageView的布局样式，及间距
 *
 * @param style titleLabel和imageView的布局样式
 * @param space titleLabel和imageView的间距
 */
- (void)layoutButtonWithEdgeInsetsStyle:(ButtonImageEdgeInsetsStyle)style imageTitleSpace:(CGFloat)space;


/**
 设置角标的个数（右上角）
 @param badgeValue <#badgeValue description#>
 */
- (void)setBadgeValue:(NSInteger)badgeValue;

@end

.m文件

#import "UIButton+MaxMethod.h"

@implementation UIButton (MaxMethod)

- (void)layoutButtonWithEdgeInsetsStyle:(ButtonImageEdgeInsetsStyle)style imageTitleSpace:(CGFloat)space {
    // 1. 得到imageView和titleLabel的宽、高
    CGFloat imageWith = self.imageView.frame.size.width;
    CGFloat imageHeight = self.imageView.frame.size.height;
    
    CGFloat labelWidth = 0.0;
    CGFloat labelHeight = 0.0;
    
    if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
        // 由于iOS8中titleLabel的size为0，用下面的这种设置
        labelWidth = self.titleLabel.intrinsicContentSize.width;
        labelHeight = self.titleLabel.intrinsicContentSize.height;
    } else {
        labelWidth = self.titleLabel.frame.size.width;
        labelHeight = self.titleLabel.frame.size.height;
    }
    
    // 2. 声明全局的imageEdgeInsets和labelEdgeInsets
    UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;
    UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;
    
    // 3. 根据style和space得到imageEdgeInsets和labelEdgeInsets的值
    
    switch (style) {
        case ButtonImageEdgeInsetsStyleTop:
        {
            imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0, 0, 0, -labelWidth);
            labelEdgeInsets = UIEdgeInsetsMake(0, -14, -imageHeight-space/2.0, 0);
        }
            break;
            
        case ButtonImageEdgeInsetsStyleLeft:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);
        }
            break;
            
        case ButtonImageEdgeInsetsStyleBottom:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);
            labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);
        }
            break;
            
        case ButtonImageEdgeInsetsStyleRight:
        {
            imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);
            labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);
        }
            break;
            
        default:
            break;
    }
    
    // 4. 赋值
    self.titleEdgeInsets = labelEdgeInsets;
    self.imageEdgeInsets = imageEdgeInsets;
}


/**
 设置角标的个数（右上角）
 
 @param badgeValue <#badgeValue description#>
 */
- (void)setBadgeValue:(NSInteger)badgeValue{
    
    CGFloat badgeW   = 20;
    CGSize imageSize = self.imageView.frame.size;
    CGFloat imageX   = self.imageView.frame.origin.x;
    CGFloat imageY   = self.imageView.frame.origin.y;
    
    UILabel *badgeLable = [[UILabel alloc]init];
    badgeLable.text = [NSString stringWithFormat:@"%ld",badgeValue];
    badgeLable.textAlignment = NSTextAlignmentCenter;
    badgeLable.textColor = [UIColor whiteColor];
    badgeLable.font = [UIFont systemFontOfSize:12];
    badgeLable.layer.cornerRadius = badgeW*0.5;
    badgeLable.clipsToBounds = YES;
    badgeLable.backgroundColor = [UIColor redColor];
    
    CGFloat badgeX = imageX + imageSize.width - badgeW*0.5;
    CGFloat badgeY = imageY - badgeW*0.25;
    badgeLable.frame = CGRectMake(badgeX, badgeY, badgeW, badgeW);
    [self addSubview:badgeLable];
}
@end