iOS TabBarItem设置红点（未读消息）

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

#import <uikit/uikit.h>
@interface uitabbar (extension)
- (void)showbadgeonitmindex:(int)index;
- (void)hidebadgeonitemindex:(int)index;
@end

#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];

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