blocks|key|132206|text|使用UILongPressGestureRecognizer并将其minimumPressDuration设置为0。在UIGestureRecognizerStateBegan状态下，它的行为就像是触碰。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|132207|对于Swift+4%2B|132208|func+setupTap()+{
++++let+touchDown+=+UILongPressGestureRecognizer(target:self,+action:+#selector(didTouchDown))
++++touchDown.minimumPressDuration+=+0
++++view.addGestureRecognizer(touchDown)
}

@objc+func+didTouchDown(gesture:+UILongPressGestureRecognizer)+{
++++if+gesture.state+==+.began+{
++++++++doSomething()
++++}
}|code-block|syntax|javascript|132209|对于Objective-C|132210|-(void)setupLongPress
{
+++self.longPress+=+[[UILongPressGestureRecognizer+alloc]+initWithTarget:self+action:@selector(didLongPress:)];
+++self.longPress.minimumPressDuration+=+0;
+++[self.view+addGestureRecognizer:self.longPress];
}

-(void)didLongPress:(UILongPressGestureRecognizer+*)gesture
{
+++if+(gesture.state+==+UIGestureRecognizerStateBegan){
++++++[self+doSomething];
+++}
}|132211|entityMap^0|X|K|1N|T|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

<p>Use a UILongPressGestureRecognizer and set its <code>minimumPressDuration</code> to 0. It will act like a touch down during the <code>UIGestureRecognizerStateBegan</code> state.</p>

<h1>For Swift 4+</h1>

<pre><code>func setupTap() {
    let touchDown = UILongPressGestureRecognizer(target:self, action: #selector(didTouchDown))
    touchDown.minimumPressDuration = 0
    view.addGestureRecognizer(touchDown)
}

@objc func didTouchDown(gesture: UILongPressGestureRecognizer) {
    if gesture.state == .began {
        doSomething()
    }
}
</code></pre>

<h1>For Objective-C</h1>

<pre><code>-(void)setupLongPress
{
   self.longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(didLongPress:)];
   self.longPress.minimumPressDuration = 0;
   [self.view addGestureRecognizer:self.longPress];
}

-(void)didLongPress:(UILongPressGestureRecognizer *)gesture
{
   if (gesture.state == UIGestureRecognizerStateBegan){
      [self doSomething];
   }
}
</code></pre>


blocks|key|132233|text|这是另一种解决方案。创建UIControl的子类。你甚至可以在故事板中像UIView一样使用它，因为UIControl是UIView的子类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|132234|class+TouchHandlingView:+UIControl+{
}|code-block|syntax|javascript|132235|并对其执行addTarget：|132236|@IBOutlet+weak+var+mainView:+TouchHandlingView!
...

mainView.addTarget(self,+action:+"startAction:",+forControlEvents:+.TouchDown)
...|132237|然后，指定的操作将像UIButton一样被调用：|132238|func+startAction(sender:+AnyObject)+{
++++print("start")
}|132239|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>This is another solution. Create subclass of UIControl. You can use it like UIView even in Storyboard because UIControl is subclass of UIView.</p>

<pre><code>class TouchHandlingView: UIControl {
}
</code></pre>

<p>And addTarget to it:</p>

<pre><code>@IBOutlet weak var mainView: TouchHandlingView!
...

mainView.addTarget(self, action: "startAction:", forControlEvents: .TouchDown)
...
</code></pre>

<p>Then the designated action will be called like UIButton:</p>

<pre><code>func startAction(sender: AnyObject) {
    print("start")
}
</code></pre>


blocks|key|132257|text|Swift+(无子类化)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|132258|这是一个类似于Rob+Caraway's+Objective-C+answer的Swift版本。|offset|length|132259|这个想法是使用minimumPressDuration设置为零的长按手势识别器，而不是使用轻击手势识别器。这是因为长按手势识别器报告触摸开始事件，而轻击手势不报告。|style|CODE|132260|import+UIKit
class+ViewController:+UIViewController+{

++++@IBOutlet+weak+var+myView:+UIView!

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++//+Add+"long"+press+gesture+recognizer
++++++++let+tap+=+UILongPressGestureRecognizer(target:+self,+action:+#selector(tapHandler))
++++++++tap.minimumPressDuration+=+0
++++++++myView.addGestureRecognizer(tap)
++++}

++++//+called+by+gesture+recognizer
++++@objc+func+tapHandler(gesture:+UITapGestureRecognizer)+{

++++++++//+handle+touch+down+and+touch+up+events+separately
++++++++if+gesture.state+==+.began+{
++++++++++++//+do+something...
++++++++++++print("tap+down")
++++++++}+else+if+gesture.state+==+.ended+{+//+optional+for+touch+up+event+catching
++++++++++++//+do+something+else...
++++++++++++print("tap+up")
++++++++}
++++}
}|code-block|syntax|javascript|132261|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/18061848/3681880^0|0|7|W|0|0|7|K|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@$D|12|E|13|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|14|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<h2>Swift (without subclassing)</h2>

<p>Here is a Swift version similar to <a href="https://stackoverflow.com/a/18061848/3681880">Rob Caraway's Objective-C answer</a>.</p>

<p>The idea is to use a long press gesture recognizer with the <code>minimumPressDuration</code> set to zero rather than using a tap gesture recognizer. This is because the long press gesture recognizer reports touch began events while the tap gesture does not.</p>

<pre><code>import UIKit
class ViewController: UIViewController {

    @IBOutlet weak var myView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Add "long" press gesture recognizer
        let tap = UILongPressGestureRecognizer(target: self, action: #selector(tapHandler))
        tap.minimumPressDuration = 0
        myView.addGestureRecognizer(tap)
    }

    // called by gesture recognizer
    @objc func tapHandler(gesture: UITapGestureRecognizer) {

        // handle touch down and touch up events separately
        if gesture.state == .began {
            // do something...
            print("tap down")
        } else if gesture.state == .ended { // optional for touch up event catching
            // do something else...
            print("tap up")
        }
    }
}
</code></pre>


<p>What I'm using the tap event for is very time-sensitive, so I'm curious if it's possible to make UITapGestureRecognizer activate when the user simply touches down, rather than requiring them to touch up as well?</p>


UITapGestureRecognizer - make it work on touch down, not touch up?

Objective-C

Swift

我使用tap事件的目的是非常时间敏感的，所以我很好奇是否有可能让UITapGestureRecognizer在用户简单地触碰时激活，而不是要求他们也触摸？

问UITapGestureRecognizer -让它在触地上工作，而不是在触碰上？
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问UITapGestureRecognizer -让它在触地上工作，而不是在触碰上？
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