导航到 iPhone 中的另一个视图

发布于 2024-10-10 04:13:43 字数 880 浏览 0 评论 0原文

这是我的代码，我试图从一个视图到另一个视图，而不会出现任何内存泄漏。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    


    firstviewcontroller *first = [[firstviewcontroller alloc] init];
    [window addSubview:first.view];
    [self.window makeKeyAndVisible];

    return YES;
}

-(IBAction)gotosecondview:(id)sender
{ 
    secondviewcontroller *second = [[secondviewcontroller alloc] init];
    [self.view addSubview:second.view];
    [second release];
}

-(IBAction)gotofirstview:(id)sender
{
    [self.view  removeFromSuperview];
}

为了使上面的代码工作而不崩溃，我所要做的就是删除[第二个版本]。如果我删除它，我会收到内存错误（构建和分析）。我该如何解决这个问题。我不想使用 [self.navigationController PushViewController:第二个动画：YES]; 我所做的就是从一个视图导航到另一个视图，反之亦然，而不使用导航控制器。我的firstviewcontroller和secondviewcontroller是UIViewController类型。

提前致谢。

原文

here is my code , i am trying to get from one view to another without any memory leaks.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    


    firstviewcontroller *first = [[firstviewcontroller alloc] init];
    [window addSubview:first.view];
    [self.window makeKeyAndVisible];

    return YES;
}

-(IBAction)gotosecondview:(id)sender
{ 
    secondviewcontroller *second = [[secondviewcontroller alloc] init];
    [self.view addSubview:second.view];
    [second release];
}

-(IBAction)gotofirstview:(id)sender
{
    [self.view  removeFromSuperview];
}

to make the above code work without crashing , all i have to do is remove [second release].
if I remove it I get memory errors (build and analyze) . how can i solve this problem. and i dont want to use [self.navigationController pushViewController:second animated:YES];
all i am trying to do i navigating from one view to another and vice versa WITHOUT using navigation controller. my firstviewcontroller and secondviewcontroller are of type UIViewController.

Thanks in advance.

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寄风 2024-10-17 04:13:43

您需要在显示视图时保持当前视图控制器处于活动状态（以便它可以处理用户输入等）。

在代码中，您可以通过多种方式实现这一点：

将 firstviewcontroller 和 secondviewcontroller 的实例保留为实例变量，并在 dealloc 上释放它们方法。
为当前使用的 UIViewController 保留一个实例变量，并在切换到另一个视图时释放它。

第二个选项的代码如下所示：

@interface
    UIViewController *currentViewController;
@end

@implementation

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions {

    firstviewcontroller *first = [[[firstviewcontroller alloc] init] autorelease];
    [self switchToViewController:first];

    [self.window makeKeyAndVisible];

    return YES;
}

- (void)switchToViewController:(UIViewController *)aViewController {
    [currentViewController.view removeFromSuperview];
    [currentViewController release];

    currentViewController = [aViewController retain];
    [self.window addSubview:currentViewController.view];
}

-(IBAction)gotosecondview:(id)sender { 
    [self switchToViewController:[[[secondviewcontroller alloc] init] autorelease]];
}

@end

这里，维持单个 UIViewController 活动的所有逻辑都位于 switchToViewController 方法中，该方法还处理切换逻辑从一种观点到另一种观点。作为额外的好处，您可以通过在 switchToViewController 中添加几行来快速添加对动画的支持。

You need to keep the current view controller alive while its view is showing (so it can process the user input, etc.).

In your code, you can achieve that in several ways:

Keep an instance of firstviewcontroller and secondviewcontroller as instance variables, and release them on the dealloc method.
Keep an instance variable with the currently in use UIViewController and release it when you switch to another view.

The code for the second option would look something like this:

@interface
    UIViewController *currentViewController;
@end

@implementation

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions {

    firstviewcontroller *first = [[[firstviewcontroller alloc] init] autorelease];
    [self switchToViewController:first];

    [self.window makeKeyAndVisible];

    return YES;
}

- (void)switchToViewController:(UIViewController *)aViewController {
    [currentViewController.view removeFromSuperview];
    [currentViewController release];

    currentViewController = [aViewController retain];
    [self.window addSubview:currentViewController.view];
}

-(IBAction)gotosecondview:(id)sender { 
    [self switchToViewController:[[[secondviewcontroller alloc] init] autorelease]];
}

@end

Here, all the logic for maintaining a single UIViewController alive lies in the switchToViewController method, which also handles the logic for switching from one view to another. As an added bonus, you can quickly add support for animations by adding a couple of lines in switchToViewController.

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