Question

I have some destructive operations that need confirmation, and I’m using the UIActionSheet.

Inside the clickedButtonAtIndex I fire some lenghtly operations that need a UIActivityIndicatorView.

The problem is that I can’t see the UIActivityIndicatorView until the UIActionSheet has closed, and this happens when the operation has finished.

Can I force to close the UIActionSheet even if the user has pressed some buttons and their clickedButtonAtIndex delegate has been fired ?

In pseudo code:

• User wants to do some destructive operation
• Request confirmation with a UIActionSheet
• The user says YES
• Delegate clickedButtonAtIndex fires and invokes a lenghtly operation
• This operation, the first thing that does is opening a UIActivityIndicatorView but because the UIActionSheet is active, I can’t see until the end …

thanks,

r.

Answer 1

You can call

CFRunLoopRunInMode(UITrackingRunLoopMode, 0.1, true);

to let the UI elements refresh before your lengthy calculation begins. Alternatively, you can use

-(void)doLengthyOperation {
   show_activity_indicator_view();
   [self performSelector:@selector(doRealLengthyOperation) withObject:nil afterDelay:0.1];
}
-(void)doRealLengthyOperation {
   // do the real lengthy operations.
}