使用presentViewController时未调用viewDidDisappear

问题描述

我有一个 UIViewController 有这个方法：

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    NSLog(@"DISAPPEAR");
    lastKnownOrientation = [self interfaceOrientation];
}


-(void)openSendVC{
    SendMsgViewController *vc = [[SendMsgViewController alloc]initWithNibName:@"SendMsgViewController" bundle:nil];
    [self.navigationController pushViewController:vc animated:NO];
}

在第二个视图控制器中（ SendMsgViewController ） viewDidLoad 我有以下内容：

In the second view controller (SendMsgViewController) viewDidLoad I have the following:

[self presentViewController:picker animated:YES completion:NULL];

其中选择器是 UIImageViewPicker 。

问题是，当我调用方法 openSendVC 时，会打开一个新控制器，但 viewWillDisappear （第一个viewController）未被调用。

The problem is, when I call the method openSendVC a new controller is opened, but viewWillDisappear (of the first viewController) is not called.

推荐答案

这是正确的行为。以下是来自：

That is the correct behavior. Here's an excerpt about viewWillDisappear: from the UIViewController API docs:

呈现新的视图控制器以使其隐藏其他视图控制器不计入视图消失 - 实际上只从视图层次结构中删除（例如，使用类似 popViewControllerAnimated：）。

Presenting a new view controller so that it hides the other view controller doesn't count as the view disappearing—only actually being removed from a view hierarchy does (e.g., with something like popViewControllerAnimated:).

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