cocoa-touch

问题 Can someone explain how the delegate to a UIAlertView works? Is it automatically called or do I have to call it? Eg: - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 回答1: So long as you're correctly setting the delegate property of the UIAlertView and implementing the protocol, it will be automatically called when a user clicks on a button in your alert. Take a look at the projects listed under "Related sample code" at http://developer.apple.com/library

问题 Can someone explain how the delegate to a UIAlertView works? Is it automatically called or do I have to call it? Eg: - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 回答1: So long as you're correctly setting the delegate property of the UIAlertView and implementing the protocol, it will be automatically called when a user clicks on a button in your alert. Take a look at the projects listed under "Related sample code" at http://developer.apple.com/library

问题 This has been asked before, but there is no sample code to be found on stackoverflow and no proper solutions as far as I'm aware. I have a solution, but it looks crap. I'd be grateful for any input and modifications to get a more realistic 3D door open / book cover animation. Aim is to have an animation between UIViewControllers so that you get the effect as if you were opening a door or a book cover. ViewController 2 is static and in the background. Above it you place ViewController 1 which

问题 This has been asked before, but there is no sample code to be found on stackoverflow and no proper solutions as far as I'm aware. I have a solution, but it looks crap. I'd be grateful for any input and modifications to get a more realistic 3D door open / book cover animation. Aim is to have an animation between UIViewControllers so that you get the effect as if you were opening a door or a book cover. ViewController 2 is static and in the background. Above it you place ViewController 1 which

问题 I have a tableview and navigation bar on the top. I have a Edit button on the left of my navigation bar with the following line of code. self.navigationItem.leftBarButtonItem = self.editButtonItem; When i click on the edit button, it changes to done button. All is fine so far. Where do i add code, if i want to do a small operation when the Done button is clicked.? 回答1: The button stops committing the changes to your controller class once you override it's default action with self

问题 I want to get the index of the current object when using fast enumeration, i.e. for (MyClass *entry in savedArray) { // What is the index of |entry| in |savedArray|? } 回答1: Look at the API for NSArray and you will see the method - (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block So give that one a try [savedArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { //... Do your usual stuff here obj // This is the current object idx // This is

问题 Is there a way to make a custom keyboard to pop up when a user presses on a UITextField. I have a view with a custom keypad on it and I want that to come up when the user presses on the UITextField instead of the default apple keyboard. 回答1: Since iOS 3.2 there's a property for exactly that, called inputView. just go like this: [myTextField setInputView:myInputView] - where myInputView is obviously your custom input view. Then the system will pop up your view instead of the predefined

问题 Is there a way to make a custom keyboard to pop up when a user presses on a UITextField. I have a view with a custom keypad on it and I want that to come up when the user presses on the UITextField instead of the default apple keyboard. 回答1: Since iOS 3.2 there's a property for exactly that, called inputView. just go like this: [myTextField setInputView:myInputView] - where myInputView is obviously your custom input view. Then the system will pop up your view instead of the predefined

问题 In the following, how can I send two arguments in togButton method? I tried, but it did not work. [button addTarget:self action:@selector(togButton:) forControlEvents:UIControlEventTouchUpInside]; 回答1: control targets only accept one argument for their actions: the control that's being manipulated. There's no way to do what you want (the OS just doesn't support it). 回答2: What are you trying to put in there? Maybe you can use the tag property, or if that's not sufficient, subclass UIButton and

问题 I'm looking to implement the same technique used by atebits in the Twitter app to achieve very fast UITableView scrolling, http://blog.atebits.com/2008/12/fast-scrolling-in-tweetie-with-uitableview/ But, due to Tweetie being purchased by Twitter, atebits has ceased to exist and the sample code has gone, along with all of the css for the site. Does anybody have a copy of the sample code or a different resource on implementing this method of drawing UITableViewCell's into one view? 回答1: