UIButton长新闻活动 [英] UIButton Long Press Event

问题描述

我想模仿一个长按按钮，我该怎么做？我认为需要一个计时器。
我看到 UILongPressGestureRecognizer 但我该如何使用这种类型？

I want to emulate a long a press button, how can I do this? I think a timer is needed. I see UILongPressGestureRecognizer but how can I utilize this type?

推荐答案

您可以通过创建 UILongPressGestureRecognizer 实例并将其附加到按钮开始。

You can start off by creating and attaching the UILongPressGestureRecognizer instance to the button.

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[self.button addGestureRecognizer:longPress];
[longPress release];

然后实现处理手势的方法

And then implement the method that handles the gesture

- (void)longPress:(UILongPressGestureRecognizer*)gesture {
    if ( gesture.state == UIGestureRecognizerStateEnded ) {
         NSLog(@"Long Press");
    }
}

现在这将是基本方法。您还可以设置印刷机的最短持续时间以及可容忍的误差范围。并且还要注意，如果你在识别出手势之后几次调用该方法，那么如果你想在它结束时做一些事情，你将必须检查它的状态并处理它。

Now this would be the basic approach. You can also set the minimum duration of the press and how much error is tolerable. And also note that the method is called few times if you after recognizing the gesture so if you want to do something at the end of it, you will have to check its state and handle it.

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