带有背景显示加载中的activity

直接调用可以出现一个加载框视图

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+(UIView *)LoadingView {     AppDelegate* del = (AppDelegate*)[[UIApplication sharedApplication] delegate];     CGFloat rect = [UIScreen mainScreen].bounds.size.height;     CGFloat rect2 = [UIScreen mainScreen].bounds.size.width;     UIView* backgroudview = [[UIView alloc] initWithFrame:CGRectMake(rect2/2 - 40, rect/2 - 40, 80, 80)];     backgroudview.backgroundColor = [UIColor blackColor];     backgroudview.alpha = 0.4;     backgroudview.layer.cornerRadius = 6;     backgroudview.layer.masksToBounds = YES;           UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 2, 60, 20)];     label.text = @"请稍后...";     label.textColor = [UIColor whiteColor];     label.font = [UIFont boldSystemFontOfSize:15];     label.adjustsFontSizeToFitWidth = YES;           UIActivityIndicatorView* act = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(22, 35, 36, 36)];     act.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;     [act startAnimating];     [backgroudview addSubview:act];     [backgroudview addSubview:label];                 [del.nav.topViewController.view addSubview:backgroudview];           return backgroudview; }