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];