dismissModalViewControllerAnimated 并不总是有效？答案

【问题标题】：dismissModalViewControllerAnimated doesn't always work?dismissModalViewControllerAnimated 并不总是有效？
【发布时间】：2010-01-07 23:50:33
【问题描述】：

是什么阻止模态视图控制器被解除？我发现dismissModalViewControllerAnimated 并不总是有效？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！

【问题讨论】：

标签： iphone uiviewcontroller modal-dialog

【解决方案1】：

如果您尝试将太多导航动画过于靠近，它们通常不会起作用。尝试在延迟 0.75 秒后执行您的 dismissModalViewControllerAnimated:。

【讨论】：

【解决方案2】：

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

如果 SettingsViewController 是 UIViewController 则：

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

【讨论】：