iPhone 如何启用或禁用 UITabBar
我有一个带有标签栏的简单应用程序，它根据用户输入禁用一个或多个栏项目。我知道我需要使用我尝试过使用的 UITabBarDelegate 。但是，当我调用委托方法时，我收到未捕获的异常错误 [NSObject doesNotRecognizeSelector]。我不确定我做得是否正确，或者我没有错过什么。任何建议。
我现在所拥有的如下：
WMViewController.h
#import <UIKit/UIKit.h>
#define kHundreds 0
@interface WMViewController : UIViewController <UITabBarDelegate, UIPickerViewDelegate, UIPickerViewDataSource>{
}
@end
WMViewController.m
#import "WMViewController.h"
#import "MLDTabBarControllerAppDelegate.h"
@implementation WMViewController
- (IBAction)finishWizard{
MLDTabBarControllerAppDelegate *appDelegate = (MLDTabBarControllerAppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate setAvailabilityTabIndex:0 Enable:TRUE];
}
MLDTabBarControllerAppDelegate.h
#import <Foundation/Foundation.h>
@interface MLDTabBarControllerAppDelegate : NSObject <UITabBarDelegate>{
}
- (void) setAvailabilityTabIndex: (NSInteger) index Enable: (BOOL) enable;
@end
MLDTabBarControllerAppDelegate.m
#import "MLDTabBarControllerApplicationDelegate.h"
#import "MyListDietAppDelegate.h"
@implementation MLDTabBarControllerAppDelegate
- (void) setAvailabilityTabIndex: (NSInteger) index Enable: (BOOL) enable
{
UITabBarController *controller = (UITabBarController *)[[[MyOrganizerAppDelegate getTabBarController] viewControllers ] objectAtIndex:index];
[[controller tabBarItem] setEnabled:enable];
}
@end
我得到了一个看起来不错的控制器对象，但在 [[controller tabBarItem]setEnabled:enable]; 上崩溃了；
我错过了什么...
任何建议
谢谢，
I have a simple app with a tab bar which based upon user input disables one or more of the bar items. I understand I need to use a UITabBarDelegate which I have tried to use. However when I call the delegate method I get an uncaught exception error [NSObject doesNotRecognizeSelector]. I am not sure I am doing this all right or that I haven't missed something. Any suggestions.
What I have now is the following:
WMViewController.h
#import <UIKit/UIKit.h>
#define kHundreds 0
@interface WMViewController : UIViewController <UITabBarDelegate, UIPickerViewDelegate, UIPickerViewDataSource>{
}
@end
WMViewController.m
#import "WMViewController.h"
#import "MLDTabBarControllerAppDelegate.h"
@implementation WMViewController
- (IBAction)finishWizard{
MLDTabBarControllerAppDelegate *appDelegate = (MLDTabBarControllerAppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate setAvailabilityTabIndex:0 Enable:TRUE];
}
MLDTabBarControllerAppDelegate.h
#import <Foundation/Foundation.h>
@interface MLDTabBarControllerAppDelegate : NSObject <UITabBarDelegate>{
}
- (void) setAvailabilityTabIndex: (NSInteger) index Enable: (BOOL) enable;
@end
MLDTabBarControllerAppDelegate.m
#import "MLDTabBarControllerApplicationDelegate.h"
#import "MyListDietAppDelegate.h"
@implementation MLDTabBarControllerAppDelegate
- (void) setAvailabilityTabIndex: (NSInteger) index Enable: (BOOL) enable
{
UITabBarController *controller = (UITabBarController *)[[[MyOrganizerAppDelegate getTabBarController] viewControllers ] objectAtIndex:index];
[[controller tabBarItem] setEnabled:enable];
}
@end
I get what appear to be a good controller object but crash on the [[controller tabBarItem]setEnabled:enable];
What am I missing...
Any suggestions
Thanks,
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您需要实现 UITabBarControllerDelegate，特别是
对于那些应该禁用的 viewController 并返回 NO。
You need to implement the UITabBarControllerDelegate, in particular
and return NO for those viewControllers that should be disabled.
self.tabBarController?.tabBar.userInteractionEnabled = false将快速完成self.tabBarController?.tabBar.userInteractionEnabled = falsewill do it in swift您也可以通过选择父视图控制器来选择选项卡栏控制器。我这样做不需要实现任何代表。
You can select the tab bar controller by selecting the parent view controller too. I did this without the need of implementing any delegates.