使用nodeAtPoint选择我用手指触摸的精灵不选择精灵

Question

我在_background（绿色）上添加了两个精灵，并试图通过将手指拖过它们来选择精灵。

[_background addChild:S1];
[_background addChild:S2];

我正在使用此问题中的方法：select all the sprites my finger touches while moving

我没有受到实际太空飞船精灵的影响，只有背景。

我使用的代码：

- (void)handlePan:(UIPanGestureRecognizer *)sender {
    _touchLocation = [sender locationInView:sender.view];
    _touchLocation = [self convertPointFromView:_touchLocation];

...

if (sender.state == UIGestureRecognizerStateBegan) {
                NSLog(@"UIGestureRecognizerStateBegan");
                //////Make sure that no sprites are moved during the selecting phase//////
                _background.userInteractionEnabled = NO;
            } else if (sender.state == UIGestureRecognizerStateChanged) {
                NSLog(@"UIGestureRecognizerStateChanged");
                SKNode *node = [_background nodeAtPoint:[self convertPointFromView:_touchLocation]];
                //if (![node.name isEqualToString:@"background"]) {
                    NSLog(@"Selected node:%@", node.name);
                //}
            } else if (sender.state == UIGestureRecognizerStateEnded) {
                NSLog(@"UIGestureRecognizerStateEnded");
                _background.userInteractionEnabled = YES;
            }
...

结果：

2014-01-05 21:38:34.011 xxxxx[21172:a0b] UIGestureRecognizerStateBegan
2014-01-05 21:38:36.513 xxxxx[21172:a0b] UIGestureRecognizerStateChanged
2014-01-05 21:38:36.514 xxxxx[21172:a0b] Selected node:background
2014-01-05 21:38:36.545 xxxxx[21172:a0b] UIGestureRecognizerStateChanged
2014-01-05 21:38:36.546 xxxxx[21172:a0b] Selected node:background
2014-01-05 21:38:36.578 xxxxx[21172:a0b] UIGestureRecognizerStateChanged
2014-01-05 21:38:36.579 xxxxx[21172:a0b] Selected node:background
…
2014-01-05 21:38:36.987 xxxxx[21172:a0b] UIGestureRecognizerStateEnded

当我把手指放在太空船上时，我无法击中太空船。

我如何创建UIPanGestureRecognizer

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

Answer 1

您可以在方法开头执行此操作：

_touchLocation = [self convertPointFromView:_touchLocation];

你以后再做一次：

SKNode *node = [_background nodeAtPoint:[self convertPointFromView:_touchLocation]];

我的猜测是将点转换两次可能会给你错误的位置。您应该记录点以确定它们是正确的。

如果不是这样，那么您可能需要将位置转换为船舶父节点空间。如下：

_touchLocation = [_background convertPoint:_touchLocation toNode:_background];