实现原理：
其实是自定义一个view，将view添加到UITabBar上面，也可以是一个按钮，设置背景图片，和label。
废话少说直接上代码
搞一个UITabBar的分类
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#import <UIKit/UIKit.h>
@interface UITabBar (Extension)
- (void)showBadgeOnItmIndex:(int)index;
- (void)hideBadgeOnItemIndex:(int)index;
@end
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#import "UITabBar+Extension.h"
#define TabbarItemNums 5.0
@implementation UITabBar (badge)
//显示红点
- (void)showBadgeOnItmIndex:(int)index{
[self removeBadgeOnItemIndex:index];
//新建小红点
UIView *bview = [[UIView alloc]init];
bview.tag = 888+index;
bview.layer.cornerRadius = 5;
bview.clipsToBounds = YES;
bview.backgroundColor = [UIColor redColor];
CGRect tabFram = self.frame;
float percentX = (index+0.6)/TabbarItemNums;
CGFloat x = ceilf(percentX*tabFram.size.width);
CGFloat y = ceilf(0.1*tabFram.size.height);
bview.frame = CGRectMake(x, y, 10, 10);
[self addSubview:bview];
[self bringSubviewToFront:bview];
}
//隐藏红点
-(void)hideBadgeOnItemIndex:(int)index{
[self removeBadgeOnItemIndex:index];
}
//移除控件
- (void)removeBadgeOnItemIndex:(int)index{
for (UIView*subView in self.subviews) {
if (subView.tag == 888+index) {
[subView removeFromSuperview];
}
}
}
@end
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最后在子控制器调用就可以啦
[self.tabBarController.tabBar showBadgeOnItmIndex:4];
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持服务器之家！
原文链接：http://www.jianshu.com/p/8d654aa2aac3