Code seem do play as the order as I want - objective-c

Question

- (void)viewDidLoad {
[super viewDidLoad];
[self pingSplash];
UIViewController *next = [[self storyboard] instantiateViewControllerWithIdentifier:#"ViewController"];
[self.navigationController pushViewController:next animated:YES];
}
I mean to finish pinSplash then pushViewController, but it directly goto ViewController page, even without finishing pingSplash, what is a good way to do that kind of job?
For the pingSplash part:
- (void) pingSplash
{
SKSplashIcon *pingSplashIcon = [[SKSplashIcon alloc] initWithImage:[UIImage imageNamed:#"ping.png"] animationType:SKIconAnimationTypePing];
_splashView = [[SKSplashView alloc] initWithSplashIcon:pingSplashIcon backgroundColor:[UIColor grayColor] animationType:SKSplashAnimationTypeBounce];
_splashView.animationDuration = 5.0f;
[self.view addSubview:_splashView];
[_splashView startAnimation];
}

Answer 1

The pingSplash method returns as soon as it starts the animation which is why you end up pushing the view controller too soon.
There are a few ways to solve this. One way would be to pass a block to the pingSplash method that is run after an appropriate delay.
Here's one way:
Update the pingSplash method to take a completion handler block that is run after the 5 second delay.
- (void) pingSplash:(void (^)(void))completion
{
SKSplashIcon *pingSplashIcon = [[SKSplashIcon alloc] initWithImage:[UIImage imageNamed:#"ping.png"] animationType:SKIconAnimationTypePing];
_splashView = [[SKSplashView alloc] initWithSplashIcon:pingSplashIcon backgroundColor:[UIColor grayColor] animationType:SKSplashAnimationTypeBounce];
_splashView.animationDuration = 5.0f;
[self.view addSubview:_splashView];
[_splashView startAnimation];
if (completion) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(_splashView.animationDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
completion();
});
}
}
Then update your viewDidLoad:
- (void)viewDidLoad {
[super viewDidLoad];
[self pingSplash:^{
UIViewController *next = [[self storyboard] instantiateViewControllerWithIdentifier:#"ViewController"];
[self.navigationController pushViewController:next animated:YES];
}];
}