如何在cocos2d的模态层下停止所有CCTouch？

Question

在我的 cocos2d 游戏中，我有一个“设置”按钮，它启动一个模态层，旨在锁定其下的所有内容。为此，我使用了锁定所有 CCMenuItem 的菜单状态方法的组合，并使用了覆盖层；两者都在代码下面。

问题是这两种解决方案似乎都不适用于 CCScrollLayers。当我单击按钮（启动模态）时，CCScrollLayer 仍然可以滚动，这不是我想要的。

我想：

1. 按下按钮禁用所有触摸并禁用所有元素，包括 CCScrollLayers
2. 启动模态（仅允许触摸模态）

我试过了：

1. 使用 Touch 吞下所有触摸使用 CCTargetedTouchDelegate

[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];

1. 我试过了

self.isTouchEnabled = NO 在启动模态的层上

1. 我尝试调整该MenuStatus方法以使其适用于 CCScrollLayers，但它似乎不起作用。

我不确定我做错了什么。我的代码现在如下。

// My main layer which launches the Settings Modal Layer

#pragma mark - Lock/Unlock layers

-(void) doSettings
{    
    [self lockLayers];
    SettingsModalLayer *sml = [[[SettingsModalLayer alloc] init] autorelease];
    [sml showSettingsOnLayer:self closeBlock:^{[self unlockLayers];}];
}

-(void) lockLayers
{
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
    [self MenuStatus:NO Node:self];   
}

-(void) unlockLayers
{
    [self MenuStatus:YES Node:self];
}


// Disabled/Enable layers
-(void) MenuStatus:(BOOL)_enable Node:(id)_node
{
    for (id result in ((CCNode *)_node).children) {        


        if ([result isKindOfClass:[CCMenu class]]) {
            for (id result1 in ((CCMenu *)result).children) {
                if ([result1 isKindOfClass:[CCMenuItem class]]) {
                    ((CCMenuItem *)result1).isEnabled = _enable;
                }
            } // next
        } 

    } // next

}


-(void) registerWithTouchDispatcher {
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN+1 swallowsTouches:YES];
}

- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"Event: %@", event);
    for( UITouch *touch in touches )
    {
        CGPoint location = [touch locationInView: [touch view]];

        location = [[CCDirector sharedDirector] convertToGL: location];        
        CCLayer *gl = (CCLayer *)[self getChildByTag:4];
        [gl setIsTouchEnabled:NO];

    }
}
-(void) ccTouchCancelled:(UITouch *)touch withEvent:(UIEvent *)event
{

}


-(void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
    [self removeFromParentAndCleanup:YES];    
}

-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{

    return YES;
}



// Settings Modal Layer

-(void) showSettingsOnLayer:(CCLayer *)layer closeBlock:(void (^)())noBlock 
{
    CoverLayer *coverLayer = [[CoverLayer alloc] init];
    [layer addChild:coverLayer z:1000];
    [coverLayer runAction:[CCFadeTo actionWithDuration:kAnimationTime opacity:155]]; // smooth fade-in to dim with semi-transparency

... // Other stuff goes here

}


    // CoverLayer
    // This is meant to stop all touches, but it doesn't really work on CCScrollLayer

#define kDialogTag 1234
#import "CoverLayer.h"



// class that implements a black colored layer that will cover the whole screen 
// and eats all touches except within the dialog box child

@implementation CoverLayer
- (id)init {
    self = [super init];
    if (self) {
        [self initWithColor:ccc4(0,0,0,0) 
                      width:[CCDirector sharedDirector].winSize.width 
                     height:[CCDirector sharedDirector].winSize.height];
        self.isTouchEnabled = YES;
    }
    return self;
}

- (void)dealloc {
    [[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
    [super dealloc];
}


- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event 
{
    CGPoint touchLocation = [self convertTouchToNodeSpace: touch];
    CCNode *dialogBox = [self getChildByTag: kDialogTag];

    // eat all touches outside of dialog box
    return !CGRectContainsPoint(dialogBox.boundingBox, touchLocation);
}

Answer 1

您只需要了解CCTouchDispatcher 的优先级如何工作即可。具有最小优先级值的层将首先接收触摸事件。现在您只需相应地调整优先级即可。

创建一个阻塞层类，并在注册 CCTouchDispatcher 时将其优先级设置为最低，并覆盖 ccTouchBegan 并在其中返回 YES。

如果您查看 CCMenu 类，您会发现默认优先级是 kCCMenuTouchPriority = -128，这就是菜单项具有更高触摸优先级的原因。