uiwindow

问题 In order to make a UIView on top of all views like the behavior of UIAlertView , the best way I see is by putting it in the app window, which is by adding the view to: [[[UIApplication sharedApplication] delegate] window] However, the downside I found is that it doesn't automatically take in rotation. In order for it to take in rotation, the best way to do is by adding the view on current AppDelegate window.navigationController / rootViewController , however, by doing this it will no longer

问题 I was reading Apple docs, when I found this sentence: The AppDelegate class contains a single property: window . var window: UIWindow? This property stores a reference to the app’s window. This window represents the root of your app’s view hierarchy. It is where all of your app content is drawn. Note that the window property is an optional, which means it may have no value (be nil) at some point. What I don't understand is: why this property at some point could be nil? What's the case for it

问题 This is just a test application, There is only a AppDelegate class to create all I did was create a Window based app, set the supported orientations to only the landscape in the info.plist, and then add the following code: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [application setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft]; // Override point for customization after application launch. UIAlertView *test = [

问题 I'm trying to add a UIWindow with UIWindowLevelStatusBar level. it works in portrait mode on ipad perfectly but after rotating device its messed up. on iOS 7.x all rotations are fine except for upside-down, and on iOS 8.x only portrait mode is fine and all other orientations are messed up. any idea how to solve that? CGRect frame = [UIApplication sharedApplication].statusBarFrame; self.statusWindow = [[UIWindow alloc] initWithFrame:CGRectMake(frame.origin.x, frame.origin.y, frame.size.width,

问题 I am adding an additional UIWindow to my app. My main window rotates correctly, but this additional window I have added does not rotate. What is the best way to rotate a UIWindow according to the current device orientation? 回答1: You need to roll your own for UIWindow. Listen for UIApplicationDidChangeStatusBarFrameNotification notifications, and then set the the transform when the status bar changes. You can read the current orientation from -[UIApplication statusBarOrientation] , and

问题 Scenario: I've created an overlay window (with tag = 100) that I eventually want to dismiss. But the following code doesn't work: UIApplication.shared.windows.first?.becomeKey() UIApplication.shared.windows.last?.resignKey() (lldb) po UIApplication.shared.windows ▿ 2 elements - 0 : <UIWindow: 0x7fa698d0ad00; frame = (0 0; 768 1024); gestureRecognizers = <NSArray: 0x600000048550>; layer = <UIWindowLayer: 0x6000000278a0>> - 1 : <UIWindow: 0x7fa698d14bb0; frame = (0 0; 768 1024); autoresize = W

问题 Say, if we already have aScreen that points to the main screen, by UIScreen *aScreen = [UIScreen mainScreen]; can we get to the main UIWindow object from this UIScreen object? (do they have any connection at all? That is, instead of using [UIApplication sharedApplication].keyWindow ) 回答1: No. The application has a list of windows, usually just one. Each window has a screen property that indicates where it's currently located. The screen object holds information about the physical device. It

问题 I am trying to transition with an animation between two UIWindow images (set using backgroundColor with a UIColor patternImage ). I have two images myImage1 and myImage2 . I change the UIWindow backgroundColor once using the function changeImage1() and then again using the function changeImage2() . I also set the view.backgroundColor = UIColor.clearColor() so that I can see what is happening on the UIWindow . Code below. Test A : When I change window.backgroundColor = UIColor.redColor() to

问题 I am using new new Facebook-ios-sdk did everything what is informed in README.mdown. while running this app. It didnt showed me anything. But when i kept break point in show in Fbdialog here: UIWindow* window = [UIApplication sharedApplication].keyWindow; if (!window) { window = [[UIApplication sharedApplication].windows objectAtIndex:0]; } If any one can help me out with this it will be really great. thanks, Aby 回答1: Problem was with the APPID which we also need to provide in the plist. 来源：

问题 This question already has answers here : How to display UIView over keyboard in iOS (7 answers) Closed last year . I need to present a help screen that overlays an open keyboard - the help screen should dim the whole view underneath and keep just a small hole with full transparency to "highlight" that piece. The point is to provide some information about several view components while highlighting them. Without a keyboard, I could just put a view at top of the hierarchy, but in this case the