-(void)viewWillAppear:(BOOL)animated{
// 调用接口,在接口块中添加小红点
// 小红点
UIImageView *imageView = [[UIImageView alloc]init];
imageView.image = [UIImage imageNamed:@"redPoint.png"];
imageView.frame = CGRectMake(40, 3, 7, 7);
[self.tabBarController.tabBar addSubview:imageView];
}