xcode 显示新视图控制器的最佳实践 (iPhone)
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best-practices for displaying new view controllers ( iPhone )
提问by WoodenKitty
I need to display a couple of view controllers (eg, login screen, registration screen etc). What's the best way to bring each screen up?
我需要显示几个视图控制器（例如，登录屏幕、注册屏幕等）。显示每个屏幕的最佳方式是什么？
Currently for each screen that I'd like to display, I call a different method in the app delegate like this: Code:
目前，对于我想要显示的每个屏幕，我在应用程序委托中调用不同的方法，如下所示：
- (void) registerScreen
{
RegistrationViewController *reg = [[RegistrationViewController alloc] initWithNibName:@"RegistrationViewController" bundle:nil];
[window addSubview:reg.view];
}
- (void) LoginScreen
{
LoginViewController *log = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];
[window addSubview:log.view];
}
It works, but I cant imagine it being the best way.
它有效，但我无法想象这是最好的方法。
回答by blindjesse
I'd recommend reading the View Controller Programming Guide if you haven't: http://developer.apple.com/iphone/library/featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html
如果您还没有，我建议您阅读 View Controller Programming Guide：http: //developer.apple.com/iphone/library/featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html
It sounds like presenting a view controller modally may be your best bet - but you'll probably want to wrap it in an UINavigationController first.
听起来以模态方式呈现视图控制器可能是您最好的选择 - 但您可能希望首先将其包装在 UINavigationController 中。
eg
例如
UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:theControllerYouWantToPresent] autorelease];
[self presentModalViewController:navController animated:YES];
回答by Ian Henry
I've often wondered if this is the best way myself, but when I'm not using IB's built-in stuff (like a NavigationController) I have a single method in the AppDelegate, switchToViewController:(UIViewController *)viewControllerthat I pass...well, it's pretty self-explanatory I guess. This way there's only one place where it's done, and I can easily define transitions in that method once the app nears completion.
我经常想知道这是否是我自己最好的方法，但是当我不使用 IB 的内置内容（如 NavigationController）时，我在 AppDelegate 中有一个方法switchToViewController:(UIViewController *)viewController，我通过了......好吧，它很自我- 我猜是解释性的。这样只有一个地方完成，一旦应用程序接近完成，我可以轻松地在该方法中定义转换。
Also, don't forget to remove the previous views in your methods, otherwise you're liable to run out of memory. Something like this:
另外，不要忘记删除方法中以前的视图，否则可能会耗尽内存。像这样的东西：
-(void) switchToViewController:(UIViewController *)c {
if(c == currentController) return;
[currentController.view removeFromSuperview];
[window addSubview:c.view];
[currentController release];
currentController = [c retain];
}
