ios自定义hub指示器

UIView *loadingView
= [[UIView
alloc]
initWithFrame:CGRectMake((self.view.frame.size.width
- 80) /
2.0f, ([UIScreen
mainScreen].bounds.size.height
- 80.f)/
2.0f,
80.0f,
80.0f)];

    [loadingView
setBackgroundColor:[UIColor
grayColor]];

    [loadingView.layer
setCornerRadius:10.0f];

    [loadingView.layer
setMasksToBounds:YES];

    

   
UIActivityIndicatorView *loading = [[UIActivityIndicatorView
alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

    [loading startAnimating];

    [loading setFrame:CGRectMake(30.f,
30.0f,
20.0f,
20.0f)];

    [loadingView
addSubview:loading];

    [self.view
addSubview:loadingView];

    [loadingView
setHidden:NO];