转自：http://blog.csdn.net/u013531246/article/details/44460115
为 Tabbar 添加 类别 ： HTBadge
.h文件
import <UIKit/UIKit.h>
@interface UITabBar (badge)
/显示小红点/
- (void)showBadgeOnItemIndex:(int)index;
/隐藏小红点/ - (void)hideBadgeOnItemIndex:(int)index;
@end
.m文件
import "UITabBar+badge.h"
define TabbarItemNums 4.0 //tabbar的数量
@implementation UITabBar (badge)
-
(void)showBadgeOnItemIndex:(int)index{
//移除之前的小红点
[self removeBadgeOnItemIndex:index];//新建小红点
UIView *badgeView = [[UIView alloc]init];
badgeView.tag = 888 + index;
badgeView.layer.cornerRadius = 5;
badgeView.backgroundColor = [UIColor redColor];
CGRect tabFrame = self.frame;//确定小红点的位置
float percentX = (index +0.6) / TabbarItemNums;
CGFloat x = ceilf(percentX * tabFrame.size.width);
CGFloat y = ceilf(0.1 * tabFrame.size.height);
badgeView.frame = CGRectMake(x, y, 10, 10);
[self addSubview:badgeView];
}
-
(void)hideBadgeOnItemIndex:(int)index{
//移除小红点
[self removeBadgeOnItemIndex:index];
}
-
(void)removeBadgeOnItemIndex:(int)index{
//按照tag值进行移除
for (UIView *subView in self.subviews) {if (subView.tag == 888+index) { [subView removeFromSuperview]; }}
}
@end
调用：
//显示
[self.tabBarController.tabBar showBadgeOnItemIndex:2];
//隐藏
[self.tabBarController.tabBar hideBadgeOnItemIndex:2]
