我的应用程序的主窗口包含一个基于xib的UITabBarController(在Interface Builder中完全配置),也可以以模式显示(就像Music.app“添加歌曲到播放列表”模态视图). UITabBarController包含一些UINavigationController,它们又包含子类的UITableViewController.这是我当前正在检测的子类UITableViewController是否被呈现在一个模态的UITabBarController中：
- (void)viewDidLoad {
[super viewDidLoad];
self.isModal = NO;
UIViewController *child = self;
UIViewController *parent = self.parentViewController;
while (parent) {
if (parent.modalViewController && parent.modalViewController == child) {
self.isModal = YES;
break;
}
child = parent;
parent = parent.parentViewController;
}
if (self.isModal) {
// modal additions,eg. Done button,navigationItem.prompt
}
else {
// normal additions,eg. Now Playing button
}
}
有没有办法做到这一点,不涉及走上parentViewController树,或者将所有中间视图控制器子类化,以便在初始化时传递isModal状态？
解决方法
如果您正在寻找iOS 6,此答案已被弃用,您应该检查
Gabriele Petronella’s answer
之前我回答了一个非常类似的问题,在那里我有一个功能来确定当前控制器是否被呈现为模态,而不需要在此处对标签栏控制器进行子类化：
Is it possible to determine whether ViewController is presented as Modal?
在原来的答案中,有一些关于这个功能如何工作的基本解释,如果需要,你可以在那里检查,但是在这里
-(BOOL)isModal {
BOOL isModal = ((self.parentViewController && self.parentViewController.modalViewController == self) ||
//or if I have a navigation controller,check if its parent modal view controller is self navigation controller
( self.navigationController && self.navigationController.parentViewController && self.navigationController.parentViewController.modalViewController == self.navigationController) ||
//or if the parent of my UITabBarController is also a UITabBarController class,then there is no way to do that,except by using a modal presentation
[[[self tabBarController] parentViewController] isKindOfClass:[UITabBarController class]]);
//iOS 5+
if (!isModal && [self respondsToSelector:@selector(presentingViewController)]) {
isModal = ((self.presentingViewController && self.presentingViewController.modalViewController == self) ||
//or if I have a navigation controller,check if its parent modal view controller is self navigation controller
(self.navigationController && self.navigationController.presentingViewController && self.navigationController.presentingViewController.modalViewController == self.navigationController) ||
//or if the parent of my UITabBarController is also a UITabBarController class,except by using a modal presentation
[[[self tabBarController] presentingViewController] isKindOfClass:[UITabBarController class]]);
}
return isModal;
}
