在Sprite Kit中識別出觸摸后，Sprite節點將不會移動

Question

我試圖讓用戶在屏幕上的某個點上方觸摸時移動一個精靈節點。 我的觸摸被識別，但是沒有任何動作發生！

-(id)initWithSize:(CGSize)size {    
if (self = [super initWithSize:size]) {
    /* Setup your scene here */

    self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
    self.anchorPoint = CGPointMake(0.5, 0.5);

    SKSpriteNode *_box = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(50, 50)];
    _box.position = CGPointMake(0.5,0.5);

    [_box addChild:_box];
}
return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */

for (UITouch *touch in touches) {
    CGPoint location = [touch locationInNode:self];

    _currentTouch = touch;
}
}

-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
CGPoint currentLocation = [_currentTouch locationInView:_currentTouch.view];
if (currentLocation.y > 300) {
    _box.position = CGPointMake(_box.position.x, _box.position.y + 20);
    NSLog(@"touching");
     }
}

@end

我不確定是否要以錯誤的方式進行操作，但是我可以拼命使用一些幫助！ 謝謝！

Answer 1

您的代碼中存在許多錯誤，因此更容易向您展示一個示例項目，該項目可以滿足您的要求：

#import "MyScene.h"

@implementation MyScene
{
    SKSpriteNode *myNode;
}

-(id)initWithSize:(CGSize)size
{
    if (self = [super initWithSize:size])
    {
        myNode = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(30, 30)];
        myNode.position = CGPointMake(100, 100);
        [self addChild:myNode];
    }
    return self;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];

    if(touchLocation.y > 200)
    {
        myNode.position = CGPointMake(myNode.position.x, myNode.position.y+10);
    }
}

-(void)update:(CFTimeInterval)currentTime
{
    //
}

@end