ios4

问题 NSDictionary *json = [responseString JSONValue]; Status *statut = [[Status alloc] init]; statut.flyNumber = [json objectForKey:@"flynumber"]; statut.ftatuts = [json objectForKey:@"fstatuts"]; statut.escDepart = [json objectForKey:@"escdepart"]; statut.escArrival = [json objectForKey:@"escarrival"]; statut.proArrival = [json objectForKey:@"proarrival"]; statut.proDepart = [json objectForKey:@"prodepart"]; statut.estDepart = [json objectForKey:@"estdepart"]; statut.estArrival = [json

问题 I am learning how to manipulate view displays programmatically, I manage to display a new view in my appDelegate with the following block of code: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { UINavigationController *navController = [[UINavigationController alloc] init]; loginController = [[LoginController alloc] init]; [navController pushViewController:loginController animated:NO]; [self.window addSubview:navController.view];

问题 I am having trouble with reading data from my plist file. What is the correct way of extracting the values in a string? And lets say I have 2 items, how do I get both? Below will be the image on the plist. And below is the source code for the plist. I read somewhere that there could be a difference with Xcode 3 and Xcode 4. <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict>

问题 I have the following code (see below) and if I compile it as is i get "internal compiler error: Bus error". If I comment out the last ImageOne.transform, everything works fine. If the file ends in .m it compiles fine if I change it to .mm then it has an issue. Any ideas? [UIView animateWithDuration:duration1 delay:delay options:UIViewAnimationCurveEaseIn animations:^{ ImageOne.transform = CGAffineTransformMakeScale(scale1, scale1); ImageOne.alpha = 1.0f; } completion:^(BOOL finished){ [UIView

问题 1.I use below code for take screenshot.is it necessary to change it for high resolution UIGraphicsBeginImageContext(self.view.bounds.size); [self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); 2.what does happen if i just use one image with 640*960 resolution for both low and high quality ? (means that don't use image with @2x) 回答1: That will only take normal (320x480) resolution

问题 I am implementing push notification for a client. I have followed all the steps of push notifications setup on device (including certificate generation and everything). I have used following links as reference: Apple Push Notification Services Tutorial Programming Apple Push Notification Services I call this function in app delegates didFinishLaunchingWithOptions [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge |

问题 Which is quicker and less expensive for checking if an object already exists within a list. By using the NSArray contains object or by checking if a key already exists for an NSDictionary? Also does the NSArray containObject selecter iterate through the whole array elements? Also what about checking if a key already exists within a dictionary? Does that require iterating through all the keys. Finally, what is the best and quickest way to check if an object already exists within a large list

问题 I have a UIViewController instance(viewController1) that I want to lock in landscape mode which I am able to do. On tapping on a button I push another UIViewController(viewController2) which supports both orientations. Now, if user changes the orientation of viewController2 to portrait and goes back to viewController1, viewController1 also changes it's orientation to portrait. How can I avoid that? Thanks in advance. 回答1: Add these methods to the view controllers (BOOL

问题 What is the best way to store nsdecimalnumbers in a database? Numeric types like float, real and double are out, because it is important to preserve the precision for currency usage. The two alternatives I have considered are string and storing two ints, one holding the mantissa and one holding the exponent. The challenge facing the latter approach is that I dont see an easy way to pull the mantissa and exponent out of the nsdecimalnumber. I can get NSDecimal from NSDecimalNumber, but the

问题 My iphone app downloads user specific data from our web server. How can I identify a unique user/device? cookie? ip address? or do I need them to register first? What are some issues I need to be aware of? best practices? 回答1: You can get the devices UUID by calling [[UIDevice currentDevice] uniqueIdentifier] You probably should register the user when the app is launched for the first time. There shouldn't be any issues that people haven't already found answers to and that you can find by