捕获许多GKState类中的键按

Question

我在Objective C for Mac OS中使用SpriteKit。在使用NSNotification时，我是一个菜鸟，但我在另一个我正在研究的应用程序中使用了以下方法，但它现在无法正常工作。也许有更好的方法，但我希望能够根据应用程序的状态捕获按键。

主要问题

州开始于GameBeginState。按下空格键后，它将移至GamePlayState。如果我按任何其他键，则表明它使用keyPressed:中的GameBeginState方法，而不是keyPressed中的GamePlayState方法。有什么想法吗？我无法想象我的生活。

详细信息

我创建了一个名为CustomNotificationHandler的自定义视图，并在项目中设置了我的主SKView。

以下是CustomNotificationHandler的代码：

CustomNotificationHandler

#import "CustomNotificationHandler.h"

@implementation CustomNotificationHandler:SKView {
    // Add instance variables here

}

- (id) initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (self) {
        // Allocate and initialize your instance variables here

    }
    return self;
}

- (void) keyDown:(NSEvent *)theEvent {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"KeyPressedNotificationKey"
                                                        object:nil
                                                      userInfo:@{@"keyCode" : @(theEvent.keyCode)}];
}

@end

在我的主要课程GameScene中，我设置了GKStateMachine初始化3个州。各州的课程如下：

GamePlayState.m

#import "GameReadyState.h"
#import "GamePlayState.h"

@interface GameReadyState()

@property (weak) GameScene *scene;

@end

@implementation GameReadyState

-(instancetype) initWithScene:(GameScene*)scene {
    if (self = [super init]) {
        self.scene = scene;
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyPressed:) name:@"KeyPressedNotificationKey" object:nil];
    }
    return self;
}

-(void) didEnterWithPreviousState:(GKState *)previousState {

}

-(void) willExitWithNextState:(GKState *)nextState {

}

-(BOOL) isValidNextState:(Class)stateClass {
    return stateClass == [GamePlayState class];
}

-(void)keyPressed:(NSNotification*)notification {
    NSNumber *keyCodeObject = notification.userInfo[@"keyCode"];
    NSInteger keyCode = keyCodeObject.integerValue;
    NSLog(@"GAME READY key = %ld", (long)keyCode);
    switch (keyCode) {
        case 49:
            [self.stateMachine enterState:[GamePlayState class]];
            break;
        default:
            break;
    }
}
@end

这是第二个状态......与第一个状态几乎相同：

GamePlayState

    #import "GamePlayState.h"
#import "GamePauseState.h"

@interface GamePlayState()

@property (weak) GameScene *scene;

@end

@implementation GamePlayState

-(instancetype) initWithScene:(GameScene*)scene {
    if (self = [super init]) {
        self.scene = scene;
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyPressed:) name:@"KeyPressedNotificationKey" object:nil];
    }
    return self;
}

-(void) didEnterWithPreviousState:(GKState *)previousState {
    [_scene setPaused:NO];
}
-(BOOL) isValidNextState:(Class)stateClass {
    return stateClass == [GamePauseState class];
}

-(void) updateWithDeltaTime:(NSTimeInterval)seconds {
    [_scene.sequence moveLeft];
}

-(void)keyPressed:(NSNotification*)notification {
    NSNumber *keyCodeObject = notification.userInfo[@"keyCode"];
    NSInteger keyCode = keyCodeObject.integerValue;
    NSLog(@"GAME PLAY key = %ld", (long)keyCode);
    switch (keyCode) {
        case 53:
            [self.stateMachine enterState:[GamePauseState class]];
            [_scene setPaused:YES];
            break;
        default:
            break;
    }
}

@end