[英]Delegate function not called in AppDelegate
I have written protocol in a view controller, and implement it in AppDelegate, and when I call delegate function from view controller, the delegate function is not called. 我在视图控制器中编写了协议,并在AppDelegate中实现它,当我从视图控制器调用委托函数时,不调用委托函数。 Below is my code -
以下是我的代码 -
In class AuthenticationViewController - 在类AuthenticationViewController中 -
@class AuthenticationViewController;
@protocol ApplicationTiomeoutDelegate <NSObject>
-(void) addObserverForTimeout;
@end
And call this function using delegate - 并使用委托调用此函数 -
[self.appTimeoutDelegate addObserverForApplicationTimeout];
And in AppDelegate, I have implemented this protocol like this - 在AppDelegate中,我已经像这样实现了这个协议 -
@interface AppDelegate () <ApplicationTiomeoutDelegate>
@end
And then set delegate to self - 然后将代表设置为自我 -
AuthenticationViewController *timeoutDelegate = [[AuthenticationViewController alloc] init];
[timeoutDelegate setAppTimeoutDelegate:self];
And implemented delegate function as well in AppDelegate, which is never called somehow - 并在AppDelegate中实现了委托功能,从未以某种方式调用它 -
-(void) addObserverForApplicationTimeout{
// this function is never called
}
I am not sure what is not correct here. 我不确定这里有什么不对。
AppDelegate
being a singleton need not have the ApplicationTiomeoutDelegate
protocol invocation. 作为单例的
AppDelegate
不需要具有ApplicationTiomeoutDelegate
协议调用。 You can directly invoke addObserverForTimeout
您可以直接调用
addObserverForTimeout
You create method in your appdelegate , you can directly call it wherever you want with instance of appdelegate . 您可以在appdelegate中创建方法,您可以使用appdelegate实例直接在任何地方调用它。
For your question, check this below 对于您的问题,请查看以下内容
Where are creating instance for Your delegate and where are calling your delegate form your viewcontroller , it is used to communicate between two class, it should have reference of protocol. 在哪里为您的委托创建实例以及在哪里从您的viewcontroller调用您的委托,它用于在两个类之间进行通信,它应该具有协议的引用。
try this 尝试这个
Your viewcontroller.h 你的viewcontroller.h
@protocol customDelegate;
#import <UIKit/UIKit.h>
#import "CustomTableViewCell.h"
@interface ViewController : UIViewController<UITableViewDelegate>
{
IBOutlet UITableView *mainTableView;
}
@property (nonatomic,strong) id <customDelegate> delegate;
@end
@protocol customDelegate <NSObject>
-(void)method;
@end
ViewController.m ViewController.m
- (void)viewDidLoad {
[self.delegate method];
}
Your app delegate 你的app代表
@interface AppDelegate () <customDelegate>
@end
Your didfinishlaunghing 你的完成了
viewController = [[ViewController alloc]initWithNibName:@"ViewController" bundle:nil];
viewController.delegate = self;
and implement method: 并实现方法:
-(void)method{
NSLog(@"calling");
}
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