@property (nonatomic,strong) UIActivityIndicatorView *activityindicator;

 

 

self.activityindicator = [[UIActivityIndicatorViewalloc] initWithFrame:CGRectMake((self.view.frame.size.width-100)/2.0, self.view.frame.size.height/2.0, 100, 100)];

    self.activityindicator.backgroundColor = [UIColor colorWithWhite:0.5 alpha:0.5];
    //设置风格
    self.activityindicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    //一个布尔值，用于控制在动画停止时是否隐藏接收者
    self.activityindicator.hidesWhenStopped = YES;
    //启动
    [self.activityindicator startAnimating];
    //暂停
    //[self.activityindicator stopAnimating];
    //状态
    //self.activityindicator.isAnimating;
    //设置活动指标的颜色
    self.activityindicator.color = [UIColor blueColor];
   
   
    [self.view addSubview:self.activityindicator];