Question

-(void)touchBegan:(UITouch*)touch withEvent:(UIEvent*)event {
    CGPoint touchPoint = [touch locationInNode:self];
    [_gameBall setPosition:CGPointMake(touchPoint.x,self.gameBall.position.y)];
}

触摸后，_gameball sprite不再可见，出现这种情况的原因是什么？我记录了它并且可以看到游戏球是真的，接触点总是在我的CCNode的内容大小内。

#import "GameScene.h"

@interface GameScene()

@property (nonatomic,strong) CCSprite* gameBall;

@end
@implementation GameScene

@synthesize gameBall = _gameBall;

+(GameScene*)gameInstance
{
    return [[self alloc]init];
}
-(id)init
{
    self = [super init];
    if (self) {
        //Implement

        //user interaction
        self.userInteractionEnabled = YES;

        //Create the ball
        _gameBall = [CCSprite spriteWithImageNamed:@"small_blue_ball.png"];
        _gameBall.position = ccp(0.5f,0.1f);
        _gameBall.positionType = CCPositionTypeNormalized;
        [self addChild:_gameBall];


    }
    return self;
}
-(void)onEnter
{
    [super onEnter];
}
-(void)onExit
{
    [super onExit];
}
-(void)touchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint touchPoint = [touch locationInNode:self];
    touchPoint = [self convertToNodeSpace:touchPoint];
    [_gameBall setPosition:CGPointMake(touchPoint.x, self.gameBall.position.y)];
    NSLog(@"%f , %f",_gameBall.position.x,_gameBall.position.y);
}
-(void)touchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{

}
@end

那是.m文件

现在是.h文件

#import "cocos2d-ui.h"
#import "cocos2d.h"

@interface IntroScene : CCScene
+(CCScene*)scene;
@end

Answer 1

CGPoint touchPoint = [touch locationInNode:self];
touchPoint = [self convertToNodeSpace:touchPoint];

可能是您的问题..尝试将其更改为：

CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [self convertToNodeSpace:touchPoint];

<强> -edit -

好的，试试：

CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [[self parent] convertToNodeSpace:touchPoint];

<强> -edit2 -

刚刚注意到cgpointmake：

[_gameBall setPosition:CGPointMake(touchPoint.x, self.gameBall.position.y)];

可能没有做任何特别的事情，但您应该保持代码单调，就像使用_gameball.position然后也使用_gameball.position.y

一样

所以可能想把它改成：

_gameBall setPosition:CGPointMake(touchPoint.x, _gameBall.position.y)];

<强> -edit3 -

这似乎对我有用：

CGPoint touchPoint = [touch locationInView:[touch view]];
touchPoint = [[_gameBall parent] convertToNodeSpace:touchPoint];
[_gameBall setPosition:ccp(touchPoint.x, _gameBall.position.y)];

- 最终修改

由于您使用的是cocos2d，还可以使用他们的ccTouchesBegan函数。将其更改为：

-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSArray* touchArray = [touches allObjects];
    for (UITouch* touch in touchArray)
    {
        CGPoint touchPoint = [touch locationInView:[touch view]];
        touchPoint = [_gameBall convertToNodeSpace:touchPoint];
        [_gameBall setPosition:ccp(touchPoint.x, _gameBall.position.y)];
        break;
    }
}

如果没有注册触摸，则将[self setTouchEnabled:YES];添加到您的场景中。

CCSprite因未知原因消失

1 个答案: