Question

I have a view controller….when the user presses a button I want a black screen to fade in over the top and a uiactivityindicator to appear on top of the faded screen.

How can I get this animated fade in effect?

-(IBAction) loginToApp:(id)sender{
     //fade in view
}

Answer 1

Add another view over the top of your view, colored solid black. You can do it in IB or programatically, just make sure it has a higher z-order (is on top). Make its alpha = 0. Then:

-(IBAction) loginToApp:(id)sender{
     [UIView animateWithDuration:1.5 animations:^{ myview.alpha = 1.0; }]
}

…obviously you need an outlet or variable myview connected to that view. 1.5 = seconds. Change for your needs.