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 |
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
