我有以下问题：
我有一个故事板，其中包含三个带有 UIViewController 类的视图。我不使用序列，除了初始视图（称为视图 A）之外，所有其他视图都是使用 presentViewController 方法以编程方式创建的。我遇到的问题是，当A用presentViewController打开B，然后B用presentViewController打开C时，当我用dismissViewControllerAnimated解除C时（在C中有一个带有Outlet到C UIViewController的按钮，在self上调用dismissViewControllerAnimated），C View消失，B出现但仅持续 0.1 秒，然后我再次显示 C 视图，之后关闭按钮将不再起作用。
知道可能是什么原因吗？
最好的问候爱丁
//delegate definition used between controller A/B and B/C
@protocol ParentControllerDelegate <NSObject>
//called as delegate method from B on A and from C on B to dismiss B from A and C from B
- (void)dismissView:(UIViewController*)controller;
@end
// MainMenuViewController.h which is controller A
@interface MainMenuViewController : UIViewController <ParentControllerDelegate>
//Controller B property
@property (strong, nonatomic) ChooseLevelViewController *chooseLevelViewController;
//button to open controller B
@property (weak, nonatomic) IBOutlet UIButton *chooseLevelBtn;
@end
//MainMenuViewController.m - Controller A
@implementation MainMenuViewController
//called to present chooseLevelViewController which is controller B
- (IBAction)chooseLevelPressed:(id)sender
{
if(self.chooseLevelViewController == nil)
{
self.chooseLevelViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ChooseLevelView"];
self.chooseLevelViewController.parentControllerDelegate = self;
}
[self presentViewController:self.chooseLevelViewController animated:YES completion:nil];
}
//called from controller B over delegate mechanism to dismiss B
- (void)dismissView
{
[self.chooseLevelViewController dismissViewControllerAnimated:YES completion:nil];
}
@end
// ChooseLevelViewController.h which is controller B
@interface ChooseLevelViewController : UIViewController <ParentControllerDelegate>
//Controller A as delegate
@property (assign, nonatomic) id <ParentControllerDelegate> parentControllerDelegate;
//Controller C property
@property (strong, nonatomic) ChoosePlayerViewController *choosePlayerViewController;
//button to dismiss B over delegate A
@property (weak, nonatomic) IBOutlet UIButton *backMainBtn;
//button to open C
@property (weak, nonatomic) IBOutlet UIButton *choosePlayerBtn;
@end
//MainMenuViewController.m - controller B
@implementation ChooseLevelViewController
//calling controller A as delegate to dismiss B
- (IBAction)backMainBtnPressed:(id)sender
{
[self.parentControllerDelegate dismissView];
}
//presenting choosePlayerViewController which is controller C
- (IBAction)choosePlayerBtnPressed:(id)sender
{
if(self.choosePlayerViewController == nil)
{
self.choosePlayerViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ChoosePlayerView"];
self.choosePlayerViewController.parentControllerDelegate = self;
}
[self presentViewController:self.choosePlayerViewController animated:YES completion:nil];
}
//called from controller C over delegate mechanism to dismiss C
- (void)dismissView:(UIViewController*)controller
{
[self.choosePlayerViewController dismissViewControllerAnimated:YES completion:nil];
}
@end
//ChoosePlayerViewController.h which is controller C
@interface ChoosePlayerViewController : UIViewController
//Controller B as delegate
@property (assign, nonatomic) id <ParentControllerDelegate> parentControllerDelegate;
//button to dismiss C over delegate B
@property (weak, nonatomic) IBOutlet UIButton *closeBtn;
@end
@implementation ChoosePlayerViewController
//calling controller B as delegate to dismiss C
- (IBAction)closeBtnPressed:(id)sender
{
[self.parentControllerDelegate dismissView];
}
@end
