NSUInteger增量不一致移动时触摸移动不同的手速

Question

我已经创建了一个NSUInteger，移动触摸移动方法每像素增加。但增量并不一致。看起来，快速移动手指会缓慢增加数量，而慢慢移动手指会快速增加数量。

本质上，我创建了一个墨水瓶效果，以便在屏幕上绘图时会减少与手指移动一致的墨水量，但绘制速度不同，这不会总是相同。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch* touch = [touches anyObject]; 
    CGPoint positionInScene = [touch locationInNode:self]; 
    SKLabelNode *touchedNode = (SKLabelNode *)[self nodeAtPoint:positionInScene]; 

    pathToDraw = CGPathCreateMutable(); 
    CGPathMoveToPoint(pathToDraw, NULL, positionInScene.x, positionInScene.y); 
    lineNode = [[SKShapeNode alloc] init]; 
    lineNode.path = pathToDraw; 
    [_gameNode addChild:lineNode]; 
} 

- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event 
{ 
    UITouch* touch = [touches anyObject]; 
    CGPoint positionInScene = [touch locationInNode:self]; 
    CGPathAddLineToPoint(pathToDraw, NULL, positionInScene.x, positionInScene.y); 
    lineNode.path = pathToDraw; 
    lineNode.name = lineNodeCategoryName; 
    lineNode.physicsBody = [SKPhysicsBody bodyWithEdgeChainFromPath:pathToDraw]; 
    lineNode.physicsBody.categoryBitMask = lineNodeCategory; 
    lineNode.physicsBody.contactTestBitMask = bubble1Category|bubble2Category|bubble3Category|bubble4Category|bubble5Category; 
    lineNode.physicsBody.collisionBitMask = ballCategory; 
    lineNode.physicsBody.dynamic = YES; 
    lineNode.strokeColor = [SKColor blackColor]; 
    lineNode.glowWidth = 3.0; 

    testNumber ++; 
    testLabel.text = [NSString stringWithFormat:@"%lu",(unsigned long)testNumber]; 

    } 

Answer 1

touchesMoved:withEvent:当检测到移动事件被调用。您将无法依靠调用此方法的次数来检测用户的手指如何移动到远端。

您应该尝试依靠手指在两个事件之间行进的距离来增加测试编号。