dismissModalViewControllerAnimated并不总是有效？

Question

是什么阻止了模态视图控制器被解雇？我发现dismissModalViewControllerAnimated并不总是有用吗？例如，这不起作用：

SettingsViewController* settings = [[SettingsViewController alloc] init];
UINavigationController *settingsNav = [[UINavigationController alloc] initWithRootViewController:settings];
[navigationController presentModalViewController:settingsNav animated:YES];     
[navigationController dismissModalViewControllerAnimated:YES];

谢谢！

Answer 1

如果您尝试将太多导航动画放得太近，它们通常无法正常工作。尝试执行你的dismissModalViewControllerAnimated：延迟0.75秒后。

Answer 2

SettingsViewController* settings = [[SettingsViewController alloc] init];
UINavigationController *settingsNav = [[UINavigationController alloc] initWithRootViewController:settings];
[navigationController presentModalViewController:settingsNav animated:YES]; 
[settingsNav dismissModalViewControllerAnimated:YES];

如果SettingsViewController它是UIViewController，那么：

SettingsViewController* settings = [[SettingsViewController alloc] init];
[self presentModalViewController:settings animated:YES]; 
[settings dismissModalViewControllerAnimated:YES];