Making the launch image display longer xcode

问题

I need help with launch images on iphone. In the project settings on xcode theres an option to add launch images. I added it and it displays for 2 seconds... I want it to be more... How can i change it? Thanks :)

回答1:

You can also do it by appliying following code in

 -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:  (NSDictionary *)launchOptions
 {
       [NSThread sleepForTimeInterval:2.0]; // Used For Showing Splash Screen for More Time
 }

First create the viewcontroller set the image what you want to show as splash screen/Launc image..

Present that view in method applicationDidFinishLaunching: with Animated:No

and write following code in your another view that your presenting

-(void) viewWillAppear:(BOOL)animated
{

        [self performSelector:@selector(dismiss1) withObject:nil afterDelay:5.0f];
        [super viewWillAppear:animated];

}



-(void) dismiss1
{

         [self dismissModalViewControllerAnimated:NO];

}

If you want to show the splash screen every time app opens, then present the splashscreen viewcontroller in applicationDidBecomeActive method

回答2:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

  /*this will pause main thread for x interval seconds. 
  put on the top of application:didFinishLaunchingWithOptions, so it will not 
  proceed to show window until sleep interval is finished.*/

    [NSThread sleepForTimeInterval:2]; //add 2 seconds longer.
   //other code....
}

回答3:

You can use the sleep() method.

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    sleep(10);
    return YES;
}

回答4:

Launch images are there to make your app appear really responsive and should be a snapshot of your UI prior to any items on it like tabBars, etc. Apple doesn't really want you to use them as splash screens.

That said, a lot of people do and to achieve this result, your App delegate needs to put the same image on screen as you launch image and then you can delay launching your main app with performSelector:withObject:afterDelay:

回答5:

In Swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        Thread.sleep(forTimeInterval: 2.0)
        return true
}

回答6:

make the default view...have an image view with the same default image...and then launch the new view(main app ) after specific time using [self performselector methods

回答7:

you can put a UIImageView in your very first loaded view. say, in viewDidLoad of FirstViewController

-(void)viewDidLoad{
 appLogo = [UIImageView alloc]initWithImage:[UIImage imageNamed:@"companyLogo.png"]];
 [appLogo setFrame:CGRectMake..... ];
 self.view addSubView:appLogo];

 [self performSelector:@selector(hideAppLogo) withObject:nil afterDelay:1000000 :) ];
}

-(void)hideAppLogo{
 [appLogo setHidden:YES];
 //let the user use your app now!
}

回答8:

YOu can achieve this by adding backgroundColor of "Default.png" in window before assigning window to rootviewController and just after few seconds assign rootviewController to window and set window background color to its default.

like this -

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
 [self performSelector:@selector(openLoginScreen) withObject:nil afterDelay:0.5];
 self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"Default.png"]]; 
 [self.window makeKeyAndVisible];
}

-(void)openLoginScreen{
self.window = [UINavigation .... "YOUR ROOT VIEWCONTROLLER"];     
}

来源：https://stackoverflow.com/questions/9451556/making-the-launch-image-display-longer-xcode