ios - 基于位置的UIGestureRecognizers

Question

我正在开发一项功能，该功能将允许iOS用户在屏幕的左半部分滑动并触发方法。 UISwipeGestureRecognizers在ViewController.m文件中调用，这些识别器选择的方法在MyScene.m中。

我可以在不提供滑动位置的情况下使它正常工作，但是我没有找到一种成功的方法来使其仅在屏幕的左半部触发。我在下面添加了一些代码，这些代码显示了有无位置要求的示例。

ViewController.m:

- (void)viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
    SKView * skView = (SKView *)self.view;
    if (!skView.scene) {
        skView.showsFPS = YES;
        skView.showsNodeCount = YES;

        SKScene *scene = [MyScene sceneWithSize:skView.bounds.size];
        scene.scaleMode = SKSceneScaleModeAspectFill;
        [skView presentScene:scene];

        UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:(scene) action:@selector(screenSwipedRight)];
        swipeRight.numberOfTouchesRequired = 1;
        swipeRight.direction=UISwipeGestureRecognizerDirectionRight;
        [self.view addGestureRecognizer:(swipeRight)];

        UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:(scene) action:@selector(screenSwipedLeft)];
        swipeLeft.numberOfTouchesRequired = 1;
        swipeLeft.direction=UISwipeGestureRecognizerDirectionLeft;
        [self.view addGestureRecognizer:(swipeLeft)];

        UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:(scene) action:@selector(screenSwipedUp)];
        swipeUp.numberOfTouchesRequired = 1;
        swipeUp.direction=UISwipeGestureRecognizerDirectionUp;
        [self.view addGestureRecognizer:(swipeUp)];
    }
}

MyScene.m:

-(void)screenSwipedRight:(UISwipeGestureRecognizer *)swipedRight
{
    CGPoint touchPoint = [swipedRight locationInView:(self.view)];
    NSInteger movePlayer;
    if (touchPoint.x <=self.view.bounds.size.width/2) {
        movePlayer = 1;
    } else {
        movePlayer = 2;
    }
    if (movePlayer ==1) {
        CGFloat percentToRight = 1-(self.playerOne.position.x / self.view.bounds.size.width);
        NSTimeInterval timeToRight = self.horizontalRunSpeed * percentToRight;
        NSLog(@"Percent to right = %f",percentToRight);
        NSLog(@"Time to right = %f",timeToRight);
        SKAction *moveNodeRight = [SKAction moveToX:self.view.bounds.size.width-self.playerOne.size.width duration:timeToRight];
        [self.playerOne runAction:[SKAction sequence:@[moveNodeRight]]];
    }
}

-(void)screenSwipedLeft
{
    NSLog(@"Screen was swiped to the left");
    CGFloat percentToLeft = self.playerOne.position.x / self.view.bounds.size.width;
    NSTimeInterval timeToLeft = self.horizontalRunSpeed * percentToLeft;
    NSLog(@"Percent to left = %f",percentToLeft);
    NSLog(@"Time to left = %f",timeToLeft);
    SKAction *moveNodeLeft = [SKAction moveToX:self.playerOne.size.width duration:timeToLeft];
    [self.playerOne runAction:[SKAction sequence:@[moveNodeLeft]]];
}

-(void)screenSwipedUp
{
    NSLog(@"Screen was swiped up");

    [self runAction:[SKAction sequence:@[[SKAction runBlock:^{ self.physicsWorld.gravity = self.antiGravityAmount;}],[SKAction waitForDuration:.25],[SKAction runBlock:^{ self.physicsWorld.gravity = self.gravityAmount;}]]]];
}

我试图在swipedRight方法中区分滑动位置。

执行此代码会导致信号SIGABRT错误，但仅限于向右滑动时。向左或向上滑动可继续正常进行。它可能与从“locationInView”中选择视图有关，但是我可能完全错了。

有人知道如何进行这项工作吗？

感谢您的帮助。

编辑:这是关于错误的日志文件-

2014-01-04 18:10:3​​2.316 Romp [584:70b]找不到CFBundle 0x976afe0的可执行文件(未加载)

2014-01-04 18:10:3​​2.375 Romp [584:70b] viewDidLoad已运行

2014-01-04 18:10:3​​2.425 Romp [584:70b]大小:{480，320}

2014-01-04 18:10:3​​2.427 Romp [584:70b]屏幕已初始化

2014-01-04 18:10:3​​3.917 Romp [584:70b]-[MyScene screenSwipedRight]:无法识别的选择器已发送到实例0x9995790

2014-01-04 18:10:3​​3.920 Romp [584:70b] *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因:'-[MyScene screenSwipedRight]:无法识别的选择器已发送至实例0x9995790'

*首先抛出调用堆栈:

(
0 CoreFoundation 0x0185e5e4 例外预处理+ 180
1个libobjc.A.dylib 0x015e18b6 objc_exception_throw + 44
2 CoreFoundation 0x018fb903-[NSObject(NSObject)didNotRecognizeSelector:] + 275
3 CoreFoundation 0x0184e90b __forwarding + 1019
4 CoreFoundation 0x0184e4ee _CF_forwarding_prep_0 + 14
5 UIKit 0x005a8e8c _UIGestureRecognizerSendActions + 230
6 UIKit 0x005a7b00-[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 383
7 UIKit 0x005a956d-[UIGestureRecognizer _delayedUpdateGesture] + 60
8 UIKit 0x005acacd _UIGestureRecognizerUpdate_block_invoke + 57
9 UIKit 0x005aca4e _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317
10 UIKit 0x005a3148 _UIGestureRecognizerUpdate + 199
11 UIKit 0x0026f19a-[UIWindow _sendGesturesForEvent:] + 1291
12 UIKit 0x002700ba-[UIWindow sendEvent:] + 1030
13 UIKit 0x00243e86-[UIApplication sendEvent:] + 242
14 UIKit 0x0022e18f _UIApplicationHandleEventQueue + 11421
15 CoreFoundation 0x017e783f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 15
16 CoreFoundation 0x017e71cb __CFRunLoopDoSources0 + 235
17 CoreFoundation 0x0180429e __CFRunLoopRun + 910
18 CoreFoundation 0x01803ac3 CFRunLoopRunSpecific + 467
19 CoreFoundation 0x018038db CFRunLoopRunInMode + 123
20图形服务0x038039e2 GSEventRunModal + 192
21 GraphicsServices 0x03803809 GSEventRun + 104
22 UIKit 0x00230d3b UIApplicationMain + 1225
23 Romp 0x0000615d主+ 141
24 libdyld.dylib 0x01e9c70d开始+ 1
25 ??? 0x00000001 0x0 +1
)

libc ++ abi.dylib:以NSException类型的未捕获异常终止
(lldb)

Answer 1

'-[MyScene screenSwipedRight]: unrecognized selector sent to instance 0x9995790'

相当标准的错误。你做这个:

 UISwipeGestureRecognizer *swipeRight =
     [[UISwipeGestureRecognizer alloc] initWithTarget:(scene) 
                                               action:@selector(screenSwipedRight)];

您将@selector(screenSwipedRight)注册为回调，这是不带参数的方法。您的代码中不存在此方法。

您的方法具有相同的名称，但是它使用了UISwipeGestureRecognizer*的附加参数，这使它成为不同的方法。因此，您需要将其注册为@selector(screenSwipedRight:)。注意最后的冒号。

PS:在您的应用中启用exception breakpoint。这样的异常发生时，Xcode将向您显示代码行。从调试中消除了很多猜测。