uiscreen

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: How to get screen size using code? NSLog(@"Top Left View : Width %f height%f",self.topLeftView.frame.size.width,self.topLeftView.frame.size.height); I have dragged the "View" from object library and put it on xib file. But what if I want to get the screen size to check whether its iphone 4,iPhone 3 or iphone 5 or any iOS Device. So that I can arrange other views accordingly. 回答1: You can use: CGsize screenSize =

问题 How to get the iPhone screen size to give calculation? 回答1: You can use the bounds property on an instance of UIScreen: CGRect screenBound = [[UIScreen mainScreen] bounds]; CGSize screenSize = screenBound.size; CGFloat screenWidth = screenSize.width; CGFloat screenHeight = screenSize.height; Most people will want the main screen; if you have a device attached to a TV, you may instead want to iterate over UIScreens and get the bounds for each. More info at the UIScreen class docs. 回答2: Here is

问题 So I created a new project with the latest version of XCode and tried to log the screen size of my app (to determine the device type for UI). I ran the following code from my iPhone 5: NSLog(@"%f", [[UIScreen mainScreen] bounds].size.height); This returned 480 , which is the screen size for the old iPhone family. I tried in the simulator and the same thing happened. Is there some property I have to enable in the project for it to recognize the screen size? This only happens for 5+ devices; if

问题 Does iOS SDK provides an easy way to check if the currentDevice has an high-resolution display (retina) ? The best way I've found to do it now is : if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] == YES && [[UIScreen mainScreen] scale] == 2.00) { // RETINA DISPLAY } 回答1: In order to detect the Retina display reliably on all iOS devices, you need to check if the device is running iOS4+ and if the [UIScreen mainScreen].scale property is equal to 2.0. You CANNOT assume a device

问题 I have view that i want to cover entire screen. And i want to set its frame to cover entire screen. Browsing the stack overflow i found these two different ways of setting view frame to cover the screen: [UIScreen mainScreen].bounds [UIApplcation sharedApplication].keyWindow.bounds It seems to me they are returning same values always, or at least in few test cases I have tried. Currently i am using UIScreen , but i curious to know difference between these calls? Will there be some cases where

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'd like to let the user control the brightness in an iOS app using a gesture recogniser to swipe up and down. Can gestures even control brightness? I've done it before using a slider and the brightness property of UIScreen... [UIScreen mainScreen].brightness = 0.5; I want to be able to control the brightness as you would with a slider (like the iBooks app) but instead of a slider use a gesture recogniser. The idea is that the gesture continuously changes the brightness value as long as a

问题 My code looks like this: CGRect screenRect = [[UIScreen mainScreen] bounds]; SomeView *infoView; if(screenRect.size.height != 568.0){ // iPhone 5/5s users crash in the next line infoView = [[[NSBundle mainBundle] loadNibNamed:@"SomeViews" owner:self options:nil] objectAtIndex:1]; }else{ infoView = [[[NSBundle mainBundle] loadNibNamed:@"SomeViews" owner:self options:nil] objectAtIndex:0] } However, I get some crash reports from Crashlytics for iPhone 5/5s users as comment in the above code. I

问题 In iOS 5.1.1, I have found that if I create my UIWindow (I'm tired of IB), and set its frame to [UIScreen mainScreen].bounds, the window shows up under the status bar . However if I do the same thing is iOS 6, it appears in the right spot just below the status bar. CGRect r = [[UIScreen mainScreen] bounds]; self.window = [[UIWindow alloc] initWithFrame: r]; self.detailViewController = [[DetailViewController alloc] init]; self.window.rootViewController = self.detailViewController; [self.window

问题 I have to set the external UIScreen's mode to run with the resolution 1024x768. First I search if the screen supports this resolution: if ([[UIScreen screens] count] > 1){ CGSize size1024; size1024.height = 0; size1024.width = 0; UIScreenMode *screenMode1024 = nil; UIScreen *secondScreen = [[UIScreen screens] objectAtIndex:1]; for(int i = 0; i < [[secondScreen availableModes] count]; i++) { UIScreenMode *current = [[[[UIScreen screens] objectAtIndex:1] availableModes] objectAtIndex: i]; if