viewDidLoad从if语句更改视图

Question

我有这段代码

if ([sessionOutput isEqualToString:@"valid"]) {
    LoggedInViewController *loggedin = [[LoggedInViewController alloc] initWithNibName:nil bundle:nil];
    [self presentViewController:loggedin animated:YES completion:nil];
}

除非更改视图，否则我收到此消息：

 Warning: Attempt to present <LoggedInViewController: 0x717fec0> on
<ViewController: 0x8a64af0> whose view is not in the window hierarchy!

我做错了什么？

Answer 1

尝试将代码移至viewDidAppear: 在调用<ViewController: 0x8a64af0>时，viewDidLoad:尚未添加到视图层次结构中。

请参阅此问题：whose view is not in the window hierarchy