CODEWITHSUNDEEP
iphoneiosobjective-cuikitgrand-central-dispatch
Tim Bodeit
Tim Bodeit

Reputation: 9693

setHidden: has unwanted delay

I currently have a really weird bug.

A method gets called, that is supposed to hide an UIActivityIndicatorView by stopping it (automatic hiding when stopped is enabled) and an UIImageView called badIndicator.

As a replacement it is supposed to show another UIImageView called goodIndicator.

[goodIndicator setHidden:NO];
[badIndicator setHidden:YES];
[refreshIndicator stopAnimating];
NSLog(@"statussetting good should be completed");

The console prints the following right away, but it takes about three seconds for the changes to happen on the screen.

2013-05-31 20:24:57.835 app name[5948:1603] statussetting good should be completed

I have tried calling the setNeedsDisplay method on the objects and on the parent view and also replace hidden with alpha. Still get the same problem.

Upvotes: 3

Views: 578

Answers (2)

jszumski
jszumski

Reputation: 7416

It sounds like you are calling this from a background thread. All interaction with UIKit needs to happen from the main thread. Try using:

dispatch_async(dispatch_get_main_queue(), ^{
    [goodIndicator setHidden:NO];
    [badIndicator setHidden:YES];
    [refreshIndicator stopAnimating];
    NSLog(@"statussetting good should be completed");
});

Upvotes: 11

Amit Gupta
Amit Gupta

Reputation: 371

you need to call this method in main thread.Try using:

-(void)hideControls { 
    [goodIndicator setHidden:NO]; 
    [badIndicator setHidden:YES]; 
    [refreshIndicator stopAnimating]; 
    NSLog(@"statussetting good should be completed"); 
}

Upvotes: 2

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