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我有一個有趣的問題，處理我正在寫的一個cocos2D程序中的觸摸事件。我在CCScene中有3個CCLayer子圖層：如何在層重疊時將觸摸處理限制爲一層？
backgroundLayer - z：0 - 用於顯示背景圖像的簡單靜態圖層。
planetLayer - z：3 - 顯示層 - 數據更改的可視化顯示在此處。
gameControlsLayer - z：5 - 層用於顯示數據控制器，如滑塊和按鈕。
我分離了行星和控制層，因爲我想平移和縮放行星層而不用擔心控制受到影響。
這裏是現場初始化代碼，設置了這些層：
- (id) init
{
self = [super init];
if (self != nil)
{
// background layer
BackgroundLayer *backgroundLayer = [BackgroundLayer node];
[self addChild:backgroundLayer z:0];
// planet layer
PlanetLayer *planetLayer = [PlanetLayer node];
[self addChild:planetLayer z:3];
// gameplay layer
GameControlsLayer *gameControlsLayer = [GameControlsLayer node];
[self addChild:gameControlsLayer z:5];
}
return self;
}
我需要觸摸操作的星球以及控制層兩者。在控制層上，觸摸處理位於層次子控件對象內。我先寫了所有這些代碼，它工作正常。
之後，我爲行星層寫了全層觸摸處理，這樣我就可以觸摸滾動和縮放。我有滾動（雖然不是縮放），並且它工作正常。我的問題是這樣的：當我觸摸並操縱控制層上的控件時，它們可以正常工作，但是，例如，當我上下滑動滑塊時，控制層後面的行星層平鋪，就好像觸摸是爲了它。
它可能是多餘的，包括代碼，但在這裏是相關片段：
對於滑塊控件，控制層的子：
- (void) onEnterTransitionDidFinish
{
[[CCTouchDispatcher sharedDispatcher]
addTargetedDelegate:self priority:1 swallowsTouches:YES];
}
- (void) onExit
{
[[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
}
#pragma mark Touch Delegate
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
CGPoint location = [[CCDirector sharedDirector]
convertToGL:[touch locationInView:[touch view]]];
float distance = [self distanceBetweenPointOne:thumbPosition
andPointTwo:location];
if (distance > thumbRadius*2)
{
return NO;
}
// touch is on the thumb. store the location so we
// can calculate changes on ccTouchMoved events
touched = YES;
return YES;
}
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
if (!touched)
{
return;
}
CGPoint location = [[CCDirector sharedDirector]
convertToGL:[touch locationInView:[touch view]]];
location = [self convertToNodeSpace:location];
// if we're too far off the thumb, abandon it
float distance = [self distanceBetweenPointOne:thumbPosition
andPointTwo:location];
if (distance > thumbRadius*3)
{
//touched = NO;
return;
}
// this call adjusts some ivars – not relevant
[self updateValueAndPosition:location];
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
if (touched)
{
touched = NO;
}
}
- (void)ccTouchCancelled:(UITouch *)touch
withEvent:(UIEvent *)event
{
[self ccTouchEnded:touch withEvent:event];
}
下面是從相關的代碼行星層：
// Yes, we want touch notifications please
//
- (void) onEnterTransitionDidFinish
{
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self
priority:0 swallowsTouches:NO];
}
#pragma mark Touch Delegate
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
CGPoint touchLocation = [touch locationInView:[touch view]];
touchLocation = [[CCDirector sharedDirector]
convertToGL:touchLocation];
// ****NOTE – the following is a kludge I used it to break
// ********** the behavior; the controls are all grouped
// ********** at the bottom of the screen. But this is not
// ********** an acceptable fix. I shouldn’t need to mask
// ********** off certain areas of the screen. This strategy
// ********** will not hold once I add other controls to the
// ********** control layer.
//
if (touchLocation.y > 250.0f)
{
self.touched = YES;
touchHash = [touch hash];
return YES;
}
return YES;
}
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
if (!touched)
{
return;
}
if ([touch hash] == touchHash)
{
CGSize screenSize = [[CCDirector sharedDirector] winSize];
CGPoint touchLocation =
[touch locationInView:[touch view]];
CGPoint prevLocation =
[touch previousLocationInView:[touch view]];
touchLocation = [[CCDirector sharedDirector]
convertToGL:touchLocation];
prevLocation = [[CCDirector sharedDirector]
convertToGL:prevLocation];
CGPoint diff = ccpSub(touchLocation, prevLocation);
CGPoint currentPosition = [self position];
CGPoint newPosition = ccpAdd(currentPosition, diff);
if (newPosition.x < lowestX)
newPosition.x = lowestX;
else if (newPosition.x > highestX-screenSize.width)
newPosition.x = highestX-screenSize.width;
if (newPosition.y < lowestY)
newPosition.y = lowestY;
else if (newPosition.y > highestY-screenSize.height)
newPosition.y = highestY-screenSize.height;
[self setPosition:newPosition];
}
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
if ([touch hash] == touchHash)
{
if (touched)
{
touched = NO;
}
}
}
- (void)ccTouchCancelled:(UITouch *)touch
withEvent:(UIEvent *)event
{
[self ccTouchEnded:touch withEvent:event];
}
我想添加縮放功能，但我需要清除這個問題之前，這將是明智的。有人在這裏有答案嗎？我覺得我失去了一些明顯的...
謝謝！