ios - 如何在 Sprite Kit 中执行没有触摸 Action 的平移？

Question

在 touchesBegan 中，我有单点触摸的逻辑。而且我正在尝试添加使用平移更改相机位置的功能。对于平底锅，我使用 touchesMoved。一切都很好，但是一旦我平移，触摸 Action 也会被执行。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    for (UITouch *touch in touches) {
        CGPoint location = [touch locationInNode:self];

        NSArray *sprites = [self nodesAtPoint:location];
        for (SKSpriteNode *sprite in sprites)
        {
            //*
            //*  How to stop executing this block when panning? 
            //*
        }

    }
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint positionInScene = [touch locationInNode:self];
    CGPoint previousPosition = [touch previousLocationInNode:self];
    CGPoint translation = CGPointMake((-1)*(positionInScene.x - previousPosition.x), (-1)*(positionInScene.y - previousPosition.y));
    CGPoint cameraPos = [self camera].position;

    [self camera].position = CGPointAdd(cameraPos, translation);

}

Answer 1

查看如何使用 IOS 内置的 Pan Gesture，使用它您将不得不选择是否允许它也执行触摸事件。

我会使用 View Controller 给你一个答案，不过你可以在其他地方使用它

Objective-C :

打开 ViewController.h 并添加以下声明:

@interface ViewController : UIViewController<UIGestureRecognizerDelegate>

...

- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer;

然后在ViewController.m中实现如下:

- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer {

    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, 
                                     recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointMake(0, 0) inView:self.view];

}

http://www.raywenderlich.com/6567/uigesturerecognizer-tutorial-in-ios-5-pinches-pans-and-more

此时你可以像上面的教程一样通过 UI 链接它，或者在开头的某个地方声明

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
[self.view addGestureRecognizer:pan];

swift :

class ViewController : UIViewController, UIGestureRecognizerDelegate

...然后在你的代码中

@IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
  let translation = recognizer.translationInView(self.view)
  if let view = recognizer.view {
    view.center = CGPoint(x:view.center.x + translation.x,
                          y:view.center.y + translation.y)
  }
  recognizer.setTranslation(CGPointZero, inView: self.view)
 }

http://www.raywenderlich.com/76020/using-uigesturerecognizer-with-swift-tutorial

此时你可以像上面的教程一样通过 UI 链接它，或者像 init 一样在开始阶段的某个地方声明:

let pan = UIPanGestureRecognizer(target: self, action: "handlePan:")
self.view.addGestureRecognizer(pan);