ios4

问题 There is a situation that I am faced with which seems like it has no solution. Here it is: I have an app on App Store. I didn't write any piece of code for this app keeping the upgrade scenario in mind. For all I could imagine, I never that I would be giving out more versions apart from the one I already have on app store. Now, the situation is that I am required to give an upgrade of my app and with in the new code, I am to identify if it is a new install of the latest version or if it is an

问题 I'm new to auto scroll functionality. I have a very lengthy .png file. what I want to do is, when I click a button I want to automatically start scrolling of that image. I had gone through scrollView sample code in sdk. but I get confused. Please any one help me Thanks in advance Praveena 回答1: Scrolling is achieved by setting the content offset. Imagine a view controller constructed something like this (e.g. in -viewDidLoad): // Load image. UIImage *image = [UIImage imageNamed:@"image.png"];

问题 I am a java developer learning Objective C for an IPhone project, my question is about the OOP design in Cocoa. I have a view based application which communicates with a web service and recives an xml, parse it and map its contens an appropriate view component (e.g if thats a date show the question with datepicker, if question has 2 values show it with a segmented control, if more with a pickerview..etc) so its a dynamic questionary with many pages. What is the best design possible here

问题 My application features a tableview which contains some rather complex tableviewcells. Therefore, these cells have been designed in Interface Builder and are instanciated later as needed using UINib which allows just that - load the content from a nib and instanciate it as needed. But UINib is only available for iOS 4.0 and above. Before I go ahead and abandon all the 3.x users, is there a way to (easily) recreate what I'm doing using pre-iOS4 classes and methods? Thanks alot!! 回答1: You can

问题 Since the display resolution is different, I wonder if there is an official guide or tutorial that shows how to load images. icons, nibs, etc. dynamically for iPhone 4 and iPhone 3GS. Thanks in advance. 回答1: The official guide is here. (You'll need a developer account) Most of the time, you'll just need to make a high resolution image with a "@2x" suffix. 回答2: The iPhone Application Programming Guide has a section on Supporting High-Resolution Screens that should answer your questions. 来源：

问题 If I have a universal app (runs on both iPhone & iPad), how do I account for UI layout differences in code if the UI differs between the devices? If I am using a XIB, I can simply load a different XIB depending on the device and use the same code. Correct? If I am creating my UI programmatically, though, how should this be handled? Is there a better way than if/elsing my way through the code and looking at the device type? I understand it's doable this way, it just doesn't seem very elegant.

问题 I have some questione about NSMutableDictionary. I read that they are only a wrapper around an hashmap, so their use for ordered list is discouraged. But I have to use it, so the problems began... I save the result of a Json (after a call to an URL) in a NSMutableDictionary and then I have two different "print": if I try to print the dictionary from console with command "po myDictionary" I have an order (the order of the original json) if I create a simple "for statement" and print every

问题 I had Take ViewController And Put Navigation Controller from Object Library than Put Tab Bar Same As Navigation Controller.... But Tab Bar Can't Show In Controller... 回答1: First declare your tab bar controller in your delegate .h file @property (strong, nonatomic) UITabBarController *tabBarController; then declare your root view controller and add it to navigation controller in .m file UIViewController *homeViewController = [[[HomeViewController alloc] initWithNibName:@"HomeViewController"

问题 I have several UILabels. I setup a UIScrollView within a app that works fine. The problem that I'm having is I want some UILabels to scroll and some to remain frozen. I don't think this is a coding problem as much as a interface builder issue. 回答1: You can simply add the UILabel as subView of scrollView which you want to scroll. And add the UILabel as subView of self.view which you dont want to scroll. 回答2: If you mean you want the labels to be fixed on top of the scrollview, then simply drag

问题 i want to add the ability to post to the facebook wall trough my iPhone app. I found various possibilities to do that, but which one is the best and shortest for iOS4? And do I need UIWebView? Thanks mat 回答1: The best way is to use the official facebook-ios-sdk. It does a good job of managing the OAuth authentication and other stuff for you, there is little for you to worry about. For example, it comes with the necessary authentication view and you don't need to store any credentials in your