ios – 使用presentViewController时未调用viewDidDisappear

发布时间：2020-12-15 01:46:49 所属栏目：百科来源：网络整理

导读：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 = [[S

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(SendMsgViewController)viewDidLoad我有以下内容：

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

其中picker是UIImageViewPicker.

问题是,当我调用openSendVC方法时,会打开一个新的控制器,但是不会调用viewWillDisappear(第一个viewController).

解决方法

这是正确的行为.这是关于viewWillDisappear的摘录：来自 UIViewController API docs：

This method is called in response to a view being removed from a view hierarchy. This method is called before the view is actually removed and before any animations are configured.

呈现一个新的视图控制器以便它隐藏另一个视图控制器并不算作视图消失 – 实际上只是从视图层次结构中移除(例如,像popViewControllerAnimated :).

（编辑：李大同）

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