自定义按钮设置BadgeNumber

  TabbarButton.h

@interface TabbarButton : UIButton

@property (nonatomic, strong) UIButton *badgeValueView;

- (void)setItemBadgeNumber:(NSInteger)number;
- (CGRect)imageRectForContentRect:(CGRect)contentRect;
- (CGRect)titleRectForContentRect:(CGRect)contentRect;

@end

TabbarButton.m

@implementation TabbarButton

- (id)init
{
    if (self = [super init]) {
        [self createBadgeValueView];
    }
    return self;
}
#pragma mark - 创建BadgeValueView
- (void)createBadgeValueView
{
    CGFloat x = 39 - badgeValueViewWH + 5;
    CGFloat y = -5;
    _badgeValueView = [[UIButton alloc] initWithFrame:CGRectMake(x, y,badgeValueViewWH, badgeValueViewWH)];
    [_badgeValueView setBackgroundImage:[UIImage imageNamed:@"badgeBG"] forState:UIControlStateNormal];
    _badgeValueView.titleLabel.font = kFont12;
    [_badgeValueView setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    _badgeValueView.hidden = YES;
    _badgeValueView.adjustsImageWhenHighlighted = NO;
    [self addSubview:_badgeValueView];
}

#pragma mark - 设置小红圈里的数字
- (void)setItemBadgeNumber:(NSInteger)number
{
    if (number != 0) {
        if (self.badgeValueView.hidden) {
            self.badgeValueView.hidden = NO;
        }
        [self.badgeValueView setTitle:[NSString stringWithFormat:@"%d",number] forState:(UIControlStateNormal)];

    }else{
        self.badgeValueView.hidden = YES;
    }
}

调用自定义按钮：

    //1.创建自定义的按钮
    TabbarButton *button = [[TabbarButton alloc]init];
    button.tag = index;
    CGFloat btnX = kScreenW / 4 * (index - 10) + 15;
    button.frame = CGRectMake(btnX, 5, 45, 45);
    
    //2.设置按钮图片和事件
    [button setImage:[UIImage imageNamed:normal] forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:selected] forState:UIControlStateDisabled];
    [button addTarget:self action:@selector(changeViewController:) forControlEvents:UIControlEventTouchDown];
    
    //3.让图片在按钮内居中
    button.imageView.contentMode = UIViewContentModeCenter;
    
    //4.创建按钮下面的文本
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(btnX, 30, 45, 20)];
    label.tag = index + 10;
    label.text = title;
    label.font = kFont11;
    label.textColor = [UIColor grayColor];
    label.textAlignment = NSTextAlignmentCenter;
    
　　 //添加到自定义的tabbar
    [_myTabBar addSubview:label];
    [_myTabBar addSubview:button];

    //设置按钮的BadgeNumber
    [button setItemBadgeNumber:1];