Iphone SDK中的同步手势识别器 [英] Simultaneous gesture recognizers in Iphone SDK

问题描述

我需要使用 UISwipeGestureRecognizer 捕捉两种不同的翻转手势（例如， UISwipeGestureRecognizerDirectionRight 和 UISwipeGestureRecognizerDirectionLeft ）。当我使用 addGestureRecognizer 方法添加两个不同的识别器时，只有最后添加的识别器有效。我已经读过我需要实现 gestureRecognizer：shouldRecognizeSimultaneouslyWithGestureRecognizer： UIGestureRecognizerDelegate 协议的方法，但没有任何作用。

I need to catch two different swipping gestures using UISwipeGestureRecognizer(for example, UISwipeGestureRecognizerDirectionRight and UISwipeGestureRecognizerDirectionLeft). When I add two different recognisers with addGestureRecognizer method, only last added recognizer works. I've read that I need to implement gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: method of UIGestureRecognizerDelegate protocol, but nothing works.

任何人都可以帮助捕捉两个或多个相同手势的简单示例吗？
谢谢！

Can anyone help with simple example of catching two or more same gestures? Thanks!

推荐答案

这很简单：

首先我们应该创建实现 UIGestureRecognizerDelegate 协议的类：

At first we should create class, that implements UIGestureRecognizerDelegate protocol:

@interface MyGestureDelegate : NSObject <UIGestureRecognizerDelegate>

@implementation MyGestureDelegate

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    return YES;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    return YES;
}

并按照以下方式使用：

    UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc]
                                              initWithTarget:self action:@selector(handleSwipeGestureLeft:)];
    [self.view addGestureRecognizer:swipeGestureLeft];
    swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    [swipeGestureLeft release];

    UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc]
                                          initWithTarget:self action:@selector(handleSwipeGesture:)];
    swipeGesture.direction = UISwipeGestureRecognizerDirectionRight;
    [self.view addGestureRecognizer:swipeGesture];

    MyGestureDelegate *deleg = [[MyGestureDelegate alloc] init];

    [swipeGesture setDelegate:deleg];
    [swipeGesture release];

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