I am fiddling with an orientation change responsive app in Xcode and am trying to figure out how I can change that my non-black view seems to rotate on a black background on orientation change!
It looks something like this:
I would like to change the black background to the colour of my view - which is pink in the depicted case.
When my app launches it also shows a black screen until the actual view appears. I have the feeling that it is the same black that becomes visible on orientation change?
I have tried to change the background colour of the window in the did-finish-launching method of my app delegate, but that did not have any effect:
- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window.backgroundColor = [UIColor purpleColor];
...
}
Any suggestions?
Try using willAnimateRotationToInterfaceOrientation:duration: method instead of willRotateToInterfaceOrientation:duration:
But I think nearly all of the apps in iOS show a glimpse of black background, it seems normal. In your case if it is for long time, try reducing the duration time.
Also check this Stackoverflow Post
Related
I am working on a launch screen where I want to add a progress bar.
LaunchScreen.xib doesn't allows me to add a progress bar on the launch screen.
So is it possible to add a view controller as the launch screen for some time interval so I can add a progress bar on the launch screen of my project?
No,you can not. You can not add any logic code to it.
And also know that, at launch screen time. Your app is not launched at all. So your code about progress bar is not running.
I think the better way is using a launch screen first,then show a viewController with a progress bar as you like.
Treat launch screen as progress indicator and do loading stuff before return "Yes" in applicationDidFinishLaunchingWithOption.as return yes line executed then view controller load it's view. but don't try too much stuff before return yes like time consuming network operation.
Yes, you can. I wanted to have control how long the LaunchScreen is visible when launching the app which I did in the didFinishLaunchingWithOptions in the AppDelegate.m file.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
int time = 3;
sleep(time);
printf("[%i] %s ***** sleeping %i seconds *****\n",__LINE__,__FUNCTION__, time);
return YES;
}
I am trying to set time for the launchscreen.xib to make it last longer, for example 5 sec,since by default it disappears too quick i searched the web but found nothing useful, can it be done ?
Thanks
The apple documentation mentions this:
A launch file or image provides a simple placeholder image that iOS displays when your app starts up. The placeholder image gives users the impression that your app is fast and responsive because it appears instantly and is quickly replaced by the first screen of your app.
So essentially the launch screen cannot be made last longer because its only displayed when the app is starting up.
Still if you want you can
create a custom UIView with the launch image
make it the Initial View Controller by dropping the arrow in storyboard to your custom UIView
present your main View Controller on top of the launch image view after x seconds using dispatch_after
You can add this in your app delegate:
float delay =5.0;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[NSThread sleepForTimeInterval:delay];
}
If you use a viewController, you can present it again in - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
making it the UIWindow's rootViewController, or presenting it modally from your application in the same method. This way, you can customize its dismissal. You can also add some animation to this viewController
So it may be another viewController than your launchScreen.
When Shazam is opened the status bar turns red and doubles it's height because of background recording, but this ruins the UI in my app. I'm now trying to change my code to support different status bar sizes, because the red status bar is also opaque, but I can't come up with a general solution because of this:
When the status bar is initially red, when I launch my app, the launch image is scaled and ruined. How to fix this?
Note: My app does NOT use recording.
[Edit]
The only solution I found was to set 'Status bar is initially hidden' to YES in .plist. I don't really need the status bar to be visible on app launch, especially if it affects my launch image when the status bar is taller than usual, i.e. when recording or during a phone call.
[Edit 2]
There are cases when the launch image will be briefly visible when the app is brought to foreground from background state. To work around this I use view-controller based status bar appearance:
- (BOOL)prefersStatusBarHidden
{
if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateBackground)
{
return YES;
}
return NO;
}
This ensures the status bar is always hidden when the app comes to foreground, so the launch image will never be affected. Don't forget to call setNeedsStatusBarAppearanceUpdate on appDidEnterBackground and (inside an animation block) on appDidBecomeActive notifications.
The red status bar is a system function. You are not going to be able to work around this - and it isn't really your 'fault' if the launch screen looks like that - if the user wants to open your app while using Shazam, they are going to see the red bar and the launch image is going to be scaled. You could change the launch image to look good when scaled, but then it would look bad the rest of the time (when the red bar wasn't at the top of the screen on launch).
After a long long long long long research and hurdles I found out simple solution for this follow as below
In Targets->General->Deployment Info check the HideStatusBar Option
like below!
And in the ViewController (Which one you kept as RootViewController) in viewDidAppear add this line of code...
[[UIApplication sharedApplication] setStatusBarHidden:NO];
Because when you uncheck HideStatusBar Option and your app needs any background process or audio related process then the status bar will become red with enlarged height. If you dont want status bar in entire app then dont add the above line in viewDidAppear and check HideStatusBar Option.
I want my application to not show the iOS status bar. I can do this in AppDelegate.m like so:
- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
application.statusBarHidden = YES;
return YES;
}
This hides the status bar great, but makes the iOS notification center and the iOS control center take 2 swipes to pull in. I do not want this behavior.
Any help would be fantastic. Thanks!
I'm sorry for the half-hearted answer, but I don't have enough rep to comment. Basically your app thinks it's in fullscreen mode, and that requires a 'double' swipe to bring up control center og notif-center. So you'll have to find a way to overwrite that default fullscreen behaviour
Long story short, I'm trying to change my iOS app's rootViewController on applicationWillEnterForeground:, like so:
- (void)applicationWillEnterForeground:(UIApplication *)application
{
MyViewController *controller = [[MyViewController alloc] init];
self.window.rootViewController = controller;
}
However, when iOS performs the "zoom in" animation that is performed when an app is moved from the background to the foreground, it still shows the previous rootViewController's view. Then, as soon as the animation is complete, the app blasts the new rootViewController's view onto the screen.
One way to solve this is to simply move that code to - (void)applicationDidEnterBackground:, but the problem with this solution is that, in my app, there is no way to tell if a new rootViewController will be assigned until - (void)applicationWillEnterForeground:(UIApplication *)application (it is based on time passed since leaving the app).
How can I force the app to redraw before iOS performs the animation taking the app from the background to the foreground?
I believe this is not possible. The screen that iOS shows of your app when it comes into the foreground is actually a screenshot the system took when the app went into the background. There is no way to manipulate or replace that image at the time the app comes back into the foreground.
This behavior is partly documented in the Moving to the Background section of the iOS Application Programming Guide:
Apps can use their applicationDidEnterBackground: method to prepare for moving to the background state. When moving to the background, all apps should do the following:
Prepare to have their picture taken. When the applicationDidEnterBackground: method returns, the system takes a picture of your app’s user interface and uses the resulting image for transition animations. If any views in your interface contain sensitive information, you should hide or modify those views before the applicationDidEnterBackground: method returns.
Apple does not explicitly document that you cannot modify or replace this screenshot at a later time but neither do they say the opposite anywhere I know of.