ios - CGRect 和触摸

Question

在这个 cocos2d 应用程序中，当我按下 ccsprite 时，nslog 没有触发。有人可以帮助我吗？

-(BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event{
NSMutableArray *targetsToDelete = [[NSMutableArray alloc] init];
for (CCSprite *target in _targets) {
    CGRect targetRect = CGRectMake(target.position.x - (target.contentSize.width/2), 
                                   target.position.y - (target.contentSize.height/2), 
                                   27, 
                                   40);


CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
if (CGRectContainsPoint(targetRect, touchLocation)) {            
    NSLog(@"Moo cheese!");
    }
}
return YES;   
}

Answer 1

首先确保将用于触摸的 Sprite 注册到 onEnter 方法中，例如:

- (void)onEnter
{
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:defaultTouchPriority_ swallowsTouches:YES];
    [super onEnter];
}

这将使您的 sprite 可触摸，因此当用户按下它时将事件触发到 sprite。然后重构您的代码以使其更具可读性并测试类似的内容:

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

    NSArray *targetsToDelete = [self touchedSpritesAtLocation:touchLocation];

    // Put your code here
    // ...

    return YES;
}

- (NSArray *)touchedSpritesAtLocation:(CGPoint)location
 {
    NSMutableArray *touchedSprites = [[NSMutableArray alloc] init];

    for (CCSprite *target in _targets)
        if (CGRectContainsPoint(target.boundingBox, location))
            [touchedSprites addObject:target];

    return [touchedSprites autorelease];
}

它应该返回已被触及的目标。