Objective-C: Adding a delay - objective-c

Question

I'm trying to add a short delay to my app. It's just the splash screen fade out so it won't affect any other functionality in the app (since nothing else is running). I've tried a variety of approaches with no success. (This is happening in viewDidLoad of a viewController):
C's sleep:
...
//add the splash screen
[self.view addSubview:splashScreen];
sleep(3);
[self fadeOut:splashScreen];
NSObject's performSelector (thought this would work because doesn't UIViewController inherit from NSObject?)
[self performSelector:#selector(fadeOut:) afterDelay:3];
NSTimeInterval:
//wait 3 seconds
NSTimeInterval theTimeInterval = 3;
[self fadeOut:splashScreen withADelayOf:&theTimeInterval];
Here is fadeOut (written to work with the NSTimeInterval example)
- (void) fadeOut:(UIView *)viewToToggle withADelayOf:(NSTimeInterval* ) animDelay {
[UIView setAnimationDelay:*animDelay];
[UIView animateWithDuration:0.25 animations:^{
viewToToggle.alpha = 0.0;
}];
}
I get the fadeOut but not the delay. Can someone nudge me in the right direction. Thanks.

Answer 1

you can try dispatch_after or animateWithDuration:delay:options:animations:completion:
double delayInSeconds = 0.5;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
//yourcode
});
or
[UIView animateWithDuration:0.175 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
//your code
}completion:^(BOOL completed){
//animation completion execution
}];

Answer 2

You should rely on this method if you want to animate some properties of your view with some delay:
+(void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
Have a look to the ref doc here.
So your code could be something like this:
[UIView animateWithDuration:0.25 delay:3.0 options: UIViewAnimationOptionCurveLinear animations:^{
viewToToggle.alpha = 0.0;
} completion: nil];

Answer 3

Tiguero and J2TheC both pointed me in the exact direction I needed to go:
Here's the code I used in case someone else needs the assist:
//add the splash screen
[self.view addSubview:splashScreen];
//fade it out with a delay
[UIView animateWithDuration:0.75 delay:3.0 options:UIViewAnimationOptionCurveEaseIn
animations:^{
splashScreen.alpha = 0.0;
}
completion:^ (BOOL finished) {
//do something on end
}];

Answer 4

Do One thing:
Make an uiimageview ref in the Appdelegate and in the didfinishLunching do this:
// Dont assign the main viewcontroller to the windwo here.
{
img = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"splash.png"]];
img.frame = CGRectMake(0, 0, 320, 480);
[self.window addSubview:img];
[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:#selector(removeSplash) userInfo:nil repeats:NO];
[self.window makeKeyAndVisible];
}
- (void)removeSplash{
[img removerFromSuperview];
self.window.rootViewController = self.viewController;
}