委托模式ios

Question

我一直在关注这个例子来帮助我建立一个委托，但不幸的是我错过了一些东西，所以它不适合我。 How do I set up a simple delegate to communicate between two view controllers?

我的代码如下所示：

// HintsViewController.h 

#import <UIKit/UIKit.h> 

@protocol HintDelegateProtocol; 

@interface HintsViewController : UIViewController 

@property (weak, nonatomic) id<HintDelegateProtocol> hintDelegate; 

-(IBAction)showFirstLetter:(id)sender 
-(IBAction)showHint:(id)sender; 
-(IBAction)showAnswer:(id)sender; 

@end 

@protocol HintDelegateProtocol <NSObject> 

-(void)HintsViewController:(HintsViewController*)hintsViewController 
       showFirstLetter:(NSString*)firstLetter; 


-(void)HintsViewController:(HintsViewController*)hintsViewController 
      showHint:(NSString*)hint; 


-(void)HintsViewController:(HintsViewController*)hintsViewController 
      showAnswer:(NSString*)answer; 

@end 

// 
// HintsViewController.m 

#import "HintsViewController.h" 

@implementation HintsViewController 

#pragma mark - 
#pragma mark IBActions 

/*为每一个建议下面我在这里/ *

- (IBAction)showHint:(id)sender 
{ 
    [self.hintDelegate HintsViewController:self showHint:@"Hint"]; 
} 

- (IBAction)showFirstLetter:(id)sender 
{ 
    [self.hintDelegate HintsViewController:self showFirstLetter:@"FirstLetter"]; 

} 

- (IBAction)showAnswer:(id)sender 
{ 
    [self.hintDelegate HintsViewController:self showAnswer:@"Answer"]; 
} 

@end 

然后改变了代码的控制器类，我有以下：

// 
// GameLogicController.h 

#import "HintsViewController.h" 

@interface GameLogicController : NSObject < HintDelegateProtocol> 

@end 

而在实施中，我有以下内容：

// GameLogicController.m 
-(void) nextRiddle 
{ 
     HintsViewController *hintsViewController = [[HintsViewController alloc] init]; 
     hintsViewController.hintDelegate = self; 
} 

#pragma mark - 
#pragma mark HintsFunctionality 

-(void)HintsViewController:(HintsViewController*)hintsViewController 
      showFirstLetter:(NSString*)firstLetter 
{ 
    NSLog(@"Show First Letter called"); 
} 


-(void)HintsViewController:(HintsViewController*)hintsViewController 
        showHint:(NSString*)hint 
{ 
    NSLog(@"show Hint called"); 
} 


-(void)HintsViewController:(HintsViewController*)hintsViewController 
       showAnswer:(NSString*)answer 
{ 
    NSLog(@"Show answer called"); 
} 

使用断点，我可以看到，在HintsViewController的IBActions被调用，但把一个断点任何在gameLogicController委托方法从来没有击中。所以我错过了在GameLogicController和HintsViewController之间建立连接的重要一步。任何人都可以帮我发现它吗？

Answer 1

假设你有两个文件：一个是你的ViewController，另一个是你的ConnectionManager类。

在ConnectionManager类中声明协议及其方法，并在ViewController类中定义协议方法。通过在ViewController类中设置ConnectionManager类的委托，您可以调用您的协议方法。

@protocol ConnManagerDelegate<NSObject> 

- (void)didReceiveData:(NSDictionary *)data; 
- (void)didFailWithError:(NSError*)error; 

@end 

@interface ConnectionManager : NSObject<NSURLConnectionDelegate> 

@property(nonatomic,assign)id<ConnManagerDelegate> delegate; 

而且elseswhere在同一个文件的.m，当你的反应来就叫

[Self.delegate didReceiveData:mDict]; 

在视图控制器文件，你的Alloc初始化的ConnectionManager下课后，其代理设置为自定义和协议方法。正是这些方法，您将从ConnectionManager类获得您的响应。

这是所有协议委托模式