在 uiviewcontroller 中导航 iOS

Question

我在导航到特定 UIViewController

时遇到内存管理问题

示例：

我有 3 个 UIViewController 并使用 Storyboard modal segue，我留在第一个，我需要直接转到第 3 个

我使用这段代码工作正常，但是当我需要 return 到 1 时，如果我重复这段代码。我收到内存警告并稍后崩溃。

这是我的代码：

转到视图 3 ->

UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController * viewTree = [storybord instantiateViewControllerWithIdentifier:@"Three"];
[self presentViewController:viewTree animated:YES completion:nil];

转到视图 1 ->

UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController * viewOne = [storybord instantiateViewControllerWithIdentifier:@"One"];
[self presentViewController:viewOne animated:YES completion:nil];

Answer 1

您必须不断地相互呈现每个视图控制器，这会引发内存警告问题。要显示 ViewControllerThree，请在 ViewControllerOne

中使用以下代码

@implementation ViewControllerOne

- (IBAction) goto3 {

      UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
      UIViewController * viewTree = [storybord instantiateViewControllerWithIdentifier:@"Three"];
      // Brings you to the third view controller.
      [self presentViewController:viewTree animated:YES completion:nil];
}

@end

然后返回 ViewControllerOne 在 ViewControllerThree

中执行此代码

@implementation ViewControllerThree

-(IBAction) backTo1 {
    // Dismisses the third view and brings you back to the first view controller.
    [self dismissViewControllerAnimated:YES completion:nil];
}

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