Question

我有2个UIViewControllers，GameController和RhythmController。我在 RhythmController.h 中定义了RhythmDelegate。 RhythmController中的doEndGame方法应该在GameController gameOver中调用委托方法，该方法实现了委托协议。

我无法理解为什么这不起作用...我的代码是错误的吗？在此先感谢您的帮助。

@class RhythmView,RhythmDelegate, RhythmController;

@protocol RhythmDelegate
@required
-(void)gameOver:(RhythmController*)aRhythmController;
@end

@interface RhythmController : UIViewController <UIGestureRecognizerDelegate, UIAlertViewDelegate> {
.....

}

@property (nonatomic, retain) IBOutlet NSObject<RhythmDelegate>* delegate;

在RhythmController.m中，我的委托调用如下：

@implementation RhythmController
@synthesize delegate;

-(void)doEndGame{

isPaused = true;
[delegate gameOver:self];
}

我确认在内部使用断点调用doEndGame。但是，它没有转到GameController中我想要的方法，它实现了委托。

#import <UIKit/UIKit.h>
#import "CoinsController.h"
#import "CoinsGame.h"
#import "HighscoreController.h"
#import "RhythmController.h"
#import "RhythmView.h"

@interface GameController : UIViewController <RhythmDelegate> {

IBOutlet UIView *landscapePlayView;
IBOutlet UIView *landscapeGameHolderView;
IBOutlet UIView *portraitPlayView;
IBOutlet UIView *portraitGameHolderView;
IBOutlet UIView *loadingView;
IBOutlet UIView *welcomeView;
IBOutlet UIButton *continueButton;
IBOutlet UIView *aboutView;
IBOutlet UIView *playView;
IBOutlet UIView *rhythmView;
//IBOutlet UIView *levelSelectView;
IBOutlet UILabel *musicNotation;
IBOutlet CoinsController *coinsController;
IBOutlet RhythmController *rhythmController;


IBOutletCollection(UILabel) NSArray *remainingTurnsLabels;
IBOutletCollection(UILabel) NSArray *scoreLabels;
IBOutlet HighscoreController *highscoreController;

CoinsGame* previousGame;
BOOL isPlayingGame;
}
-(void)setPreviousGame:(CoinsGame*)aCoinsGame;
-(CoinsGame*)currentGame;

- (IBAction)continueGameClicked:(id)sender;
- (IBAction)newGameClicked:(id)sender;
- (IBAction)highScoresClicked:(id)sender;
- (IBAction)aboutClicked:(id)sender;
- (IBAction)aboutDoneClicked:(id)sender;
- (IBAction)highscoreDoneClicked:(id)sender;

-(void)loadImages;
-(void)showPlayView: (UIInterfaceOrientation)interfaceOrientation;
-(void)doPause; 

@end

在GameController.m中，方法是

// RhythmDelegate Tasks
-(void)gameOver:(RhythmController*)aRhythmController{

NSLog(@"Came into gameOver delegated task"); 
[self.view addSubview: welcomeView];
}

Answer 1

检查您的委托变量在断点处是否为零。如果是，那么你忘了设置代表。

您可以在创建RhythmController之后在gamecontroller的viewdidload方法中轻松设置它：

rythmcontroller.delegate = self;

Answer 2

您可能忘记将GameController实例设置为RhythmController的代理人。简单地为代表实现协议并不会神奇地建立委托连接。你需要这样的一条线：

myRhythmController.delegate = myGameController;

作为备注：代表通常是weak引用，或assign属性。这是为了防止委托对象和原始对象之间的保留循环

Answer 3

您是否忘记为rhythmController实例设置委托属性？

如果您已经创建了代码，那么您可以这样做：

rhythmController = [[RhythmController alloc] init];
rhythemController.delegate = self;
...
[rhythmController release];

其中“self”是GameController实例。

iOS委托不使用UIViewControllers

3 个答案: