iPhone / iPad上的UIActivityIndi​​cator下的阴影

Question

I want to create shadow under animated UIActivityIndicator to display that other ui elements are inactive, like shadow under keyboard or alert-view. What is the best way to do this?

Answer 1

Add a view with a black background and opacity to 50% with something like this :

UIView *shadowView = [[UIView alloc] initWithFrame:yourFrame];
[shadowView setBackgroundColor:[UIColor blackColor]];
[shadowView setOpacity:0.5];

[yourCurrentView addSubview:shadowView];
[yourCurrentView bringSubviewToFront:yourActivityIndicator];