objective-c

问题 I know there is a seemingly exact duplicate of this question here: iPhone SDK: what is the difference between loadView and viewDidLoad? However, I have read that question and still it was not fully answered. I'm not using IB as the UI is dynamic. So should I create the self.view and then add the subviews in loadView , or should I create the self.view in loadView and add the subviews in viewDidLoad ? 回答1: When you load your view from a NIB and want to perform further customization after launch

问题 I need to remove all objects from an NSMutableArray . I can't seem to do this by enumerating as the code crashes. Can anyone tell me the best way to do this with a code example if possible? 回答1: This should do the trick: [myArray removeAllObjects]; 回答2: In Swift 3: yourArry.removeAllObjects() 回答3: // In Swift arrayName.removeAllObjects() 回答4: in case [YourArray removeAllObjects]; doesn't work. Then do it manually as below: int c = (int)[YourArray count]-1; for (int l = 0; l <= c; l++) {

问题 I'm trying to display a sheet on a window containing a single progress bar, to show the progress of some long function running asynchronously using Grand Central Dispatch. I've almost got it, but can't get the sheet to appear to be in focus, probably because I haven't used runModalForWindow: or similar. This is approximately what I'm doing at the moment, it happens as a result of a button press on the main window: // Prepare sheet and show it... [NSApp beginSheet:progressSheet modalForWindow

问题 I'm trying to display a sheet on a window containing a single progress bar, to show the progress of some long function running asynchronously using Grand Central Dispatch. I've almost got it, but can't get the sheet to appear to be in focus, probably because I haven't used runModalForWindow: or similar. This is approximately what I'm doing at the moment, it happens as a result of a button press on the main window: // Prepare sheet and show it... [NSApp beginSheet:progressSheet modalForWindow

问题 I'm trying to display a sheet on a window containing a single progress bar, to show the progress of some long function running asynchronously using Grand Central Dispatch. I've almost got it, but can't get the sheet to appear to be in focus, probably because I haven't used runModalForWindow: or similar. This is approximately what I'm doing at the moment, it happens as a result of a button press on the main window: // Prepare sheet and show it... [NSApp beginSheet:progressSheet modalForWindow

问题 I want to hide status bar in my iPhone app on a button press and I want to show it again on pressing another button. I tried to hide the status bar by overriding -(BOOL)prefersStatusBarHidden in my view controller but this also removes its view from the top. So a jump is seen on removing this status bar. What I want to do is just to hide the content on the status bar while keeping the background of status bar. For example: You can check the same functionality in gmail app. When you open the

问题 I want to hide status bar in my iPhone app on a button press and I want to show it again on pressing another button. I tried to hide the status bar by overriding -(BOOL)prefersStatusBarHidden in my view controller but this also removes its view from the top. So a jump is seen on removing this status bar. What I want to do is just to hide the content on the status bar while keeping the background of status bar. For example: You can check the same functionality in gmail app. When you open the

问题 on time of sign-in from google, this error appears "This app tried to access sensitive info in your Google account. To keep your account safe, google blocked this access" my code is mention below where i called google SignIn #pragma mark - Google Drive Login -(void)googlePlusLogin{ GIDSignIn *signin = [GIDSignIn sharedInstance]; signin.shouldFetchBasicProfile = true; signin.delegate = self; signin.presentingViewController = self.window.rootViewController; //signin.uiDelegate = self; NSString

问题 on time of sign-in from google, this error appears "This app tried to access sensitive info in your Google account. To keep your account safe, google blocked this access" my code is mention below where i called google SignIn #pragma mark - Google Drive Login -(void)googlePlusLogin{ GIDSignIn *signin = [GIDSignIn sharedInstance]; signin.shouldFetchBasicProfile = true; signin.delegate = self; signin.presentingViewController = self.window.rootViewController; //signin.uiDelegate = self; NSString

问题 How to detect received SMS and send SMS to that number launching my app if this sms contain specific message . Please suggest how i detect that a new messaqge received while my app is not running . 回答1: Simple answer is It is NOT possible in iOS device (non jailbroken) you cannot get any data on SMS messages or phone calls, so the best way is stop fighting with it. Not sure but it may achieve by jailbroken device. Apple said - In iPhone OS 4.0 and later, you can send text messages from within