cocoa - 滑动 CCMenu

Question

我有一个包含 CCMenuItemImage 的菜单(“myMenu”)。我希望此菜单能够检测手指滑动并相应地滑动。

我的问题是 CCMenuItemImage 似乎吸收了触摸事件。当用户触摸 CCMenuItemImages 之外的菜单时，滑动可以正常工作，但当触摸发生在这些菜单上时，滑动就不能​​正常工作。

我尝试将菜单项放在一个图层中以检测触摸(引用答案 Scrollable menu using MenuItem's )，但这似乎也不起作用。知道为什么吗？

+(id) scene
{
    CCScene *scene = [CCScene node];
    ModeMenuScene *layer = [ModeMenuScene node];
    [scene addChild: layer];
    return scene;
}

-(id) init
{
    if( (self=[super init] )) {


        CGSize winSize = [[CCDirector sharedDirector] winSize];
        CCSprite *background = [CCSprite spriteWithFile:@"bg.png"];
        background.position=ccp(winSize.width/2,winSize.height/2);
        [self addChild:background];

        mode1 = [CCMenuItemImage itemFromNormalImage:@"Mode1.png" selectedImage: @"Mode1.png" target:self selector:@selector(goToMode1:)];
        mode1label = [CCLabelTTF labelWithString:[NSString stringWithFormat:@"Level 1 %d", n] dimensions:CGSizeMake(220,53) alignment:UITextAlignmentCenter fontName:@"Arial" fontSize:20.0];
        mode1label.color = ccc3(167,0,0);
        mode1label.position=ccp(55,-30);
        [mode1 addChild:mode1label];

    // here same kind of code to define mode2,mode3,mode4 (taken out to reduce size of code)

        myMenu=[CCMenu menuWithItems:mode1,mode2,mode3,mode4,nil];
        [myMenu alignItemsHorizontallyWithPadding:25];
        myMenu.position=ccp(winSize.width/2+40,180);
        menuLayer = [CCLayer node];
        [menuLayer addChild:myMenu];
        [self addChild:menuLayer];

        [self enableTouch];

    }
    return self;
}

-(void) disableTouch{
    self.isTouchEnabled=NO;
    menuLayer.isTouchEnabled=NO;
}

-(void) enableTouch{
    self.isTouchEnabled=YES;
    menuLayer.isTouchEnabled=YES;
}


-(void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    if(location.y>100 && location.y<260) {
        draggingMenu=1;
        x_initial = location.x;
    }
    else draggingMenu=0;
}


-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    if(draggingMenu==1) {
        CGSize winSize = [[CCDirector sharedDirector] winSize];
        int x = myMenu.position.x+location.x-x_initial;
        x = MAX(0,x);
        x = MIN(x,winSize.width/2+40);
        myMenu.position=ccp(x,180);
        x_initial=location.x;
    }
}

- (void) ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    draggingMenu=0;
}


- (void)dealloc {
    [super dealloc];
}

@end

Answer 1

通过添加解决它:

-(void) registerWithTouchDispatcher
{
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN+1 swallowsTouches:NO];
}

问题是 CCMenuItemImage 吞掉了触摸并且将高优先级设置为 -128。因此需要将优先级设置为INT_MIN+1