iPad：屏幕左侧/右侧的手势识别器

Question

我正在开发一个基于 GLKViewController 的游戏，它将点击和滑动解释为游戏控件。我想通过让第一个玩家在屏幕左侧点击或滑动，让第二个玩家在屏幕右侧点击或滑动来支持双玩家模式。在一个完美的世界中，我希望手势识别器能够工作，即使滑动是草率的并且越过屏幕的中心线（滑动的起点用于确定哪个玩家获得输入）。

实现这一点的最佳方法是什么？我可以在屏幕的左半边放一个手势识别器，在屏幕的右侧放另一个吗？即使双方同时被快速点击/滑动，两个单独的识别器是否会一起正常工作？或者我应该创建一个全屏识别器并完全自己解析滑动和点击？我没有使用手势识别器的经验，所以我不知道首选方法是什么，或者当您同时滑动多个手势时它们的工作效果如何。

Answer 1

我最终在我的 GLKView 顶部制作了两个 UIView，一个在屏幕左侧，一个在右侧。每个视图都有一个UIPanGestureRecognizer 和一个UILongPressGestureRecognizer（长按识别器基本上是一个更灵活的点击——我需要用它来拒绝一些手势同时被解释为平移和点击）。这非常有效。

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Add tap and pan gesture recognizers to handle game input.
    {
        UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSidePan:)];
        panRecognizer.delegate = self;
        [self.leftSideView addGestureRecognizer:panRecognizer];

        UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSideLongPress:)];
        longPressRecognizer.delegate = self;
        longPressRecognizer.minimumPressDuration = 0.0;
        [self.leftSideView addGestureRecognizer:longPressRecognizer];
    }
    {
        UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSidePan:)];
        panRecognizer.delegate = self;
        [self.rightSideView addGestureRecognizer:panRecognizer];

        UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSideLongPress:)];
        longPressRecognizer.delegate = self;
        longPressRecognizer.minimumPressDuration = 0.0;
        [self.rightSideView addGestureRecognizer:longPressRecognizer];
    }
}

- (void)handleLeftSidePan:(UIPanGestureRecognizer *)panRecognizer
{
    [self handleGameScreenPan:panRecognizer withVirtualController:&g_iPadVirtualController[0]];
}

- (void)handleRightSidePan:(UIPanGestureRecognizer *)panRecognizer
{
    [self handleGameScreenPan:panRecognizer withVirtualController:&g_iPadVirtualController[1]];
}

- (void)handleLeftSideLongPress:(UILongPressGestureRecognizer *)longPressRecognizer
{
    [self handleGameScreenLongPress:longPressRecognizer withVirtualController:&g_iPadVirtualController[0]];
}

- (void)handleRightSideLongPress:(UILongPressGestureRecognizer *)longPressRecognizer
{
    [self handleGameScreenLongPress:longPressRecognizer withVirtualController:&g_iPadVirtualController[1]];
}