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UIButton 长按事件

[英]UIButton Long Press Event

我想模拟一个长按按钮,我该怎么做? 我认为需要一个计时器。 我看到UILongPressGestureRecognizer但我怎样才能使用这种类型?

您可以从创建UILongPressGestureRecognizer实例并将其附加到按钮开始。

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

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

现在这将是基本方法。 您还可以设置压力机的最短持续时间以及可以容忍的错误量。 还要注意,如果您在识别手势后调用该方法几次,所以如果您想在它结束时做某事,您必须检查它的 state 并处理它。

作为已接受答案的替代方案,这可以在 Xcode 中使用 Interface Builder 轻松完成。

只需从Object 库中拖动一个长按手势识别器,并将其放在您想要长按操作的按钮顶部。

接下来,将刚刚添加的Long Press Gesture Recognizer中的 Action 连接到您的视图 controller,选择发送者为UILongPressGestureRecognizer类型。 在该IBAction的代码中使用它,这与接受的答案中建议的代码非常相似:

Objective-C 中

if ( sender.state == UIGestureRecognizerStateEnded ) {
     // Do your stuff here
}

或在Swift中:

if sender.state == .Ended {
    // Do your stuff here
}

但我不得不承认,在尝试之后,我更喜欢@shengbinmeng 提出的建议作为对已接受答案的评论,即使用:

Objective-C 中

if ( sender.state == UIGestureRecognizerStateBegan ) {
     // Do your stuff here
}

或在Swift中:

if sender.state == .Began {
    // Do your stuff here
}

不同之处在于Ended ,您可以在抬起手指时看到长按的效果。 使用Began ,您可以在系统捕捉到长按后立即看到长按的效果,甚至在您将手指从屏幕上移开之前。

Swift 版本接受的答案

我对使用UIGestureRecognizerState.Began而不是.Ended进行了额外修改,因为这可能是大多数用户自然期望的。 不过,尝试它们并亲自看看。

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var button: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // add gesture recognizer
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(longPress(_:)))
        self.button.addGestureRecognizer(longPress)
        
    }

    func longPress(gesture: UILongPressGestureRecognizer) {
        if gesture.state == UIGestureRecognizerState.began {
            print("Long Press")
        }
    }
    
    @IBAction func normalButtonTap(sender: UIButton) {
        print("Button tapped")
    }
}

尝试这个:

viewDidLoad:如下所示

-(void)viewDidLoad {
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [btn setTag:1]; //you can set any integer value as tag number
    btn.title = @"Press Me";
    [btn setFrame:CGRectMake(50.0, 50.0, 60.0, 60.0)];

    // now create a long press gesture
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressTap:)];
    [btn addGestureRecognizer:longPress];
}

现在像这样调用手势方法

-(void)longPressTap:(id)sender {
     UIGestureRecognizer *recognizer = (UIGestureRecognizer*) sender
    // Recogniser have all property of button on which you have clicked
    // Now you can compare button's tag with recogniser's view.tag  
    // View frame for getting the info on which button the click event happened 
    // Then compare tag like this
    if(recognizer.view.tag == 1) { 
       // Put your button's click code here
    }

    // And you can also compare the frame of your button with recogniser's view
    CGRect btnRect = CGRectMake(50.0, 50.0, 60.0, 60.0);
    if(recogniser.view.frame == btnRect) {
       //put your button's click code here
    }

   // Remember frame comparing is alternative method you don't need  to write frame comparing code if you are matching the tag number of button 
}

我想你需要我的解决方案。

你应该有这个代码单按

- (IBAction)buttonDidPress:(id)sender {
    NSLog("buttonDidPress");
}

首先,在按钮上添加长按手势

- (void)viewWillAppear:(BOOL)animated
{
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(buttonDidLongPress:)];
    [self.button addGestureRecognizer:longPress];
}

如果识别出长按手势,则重复调用单按事件。

- (void)buttonDidLongPress:(UILongPressGestureRecognizer*)gesture
{
    switch (gesture.state) {
        case UIGestureRecognizerStateBegan:
        {
            self.timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(buttonDidPress:) userInfo:nil repeats:YES];

            NSRunLoop * theRunLoop = [NSRunLoop currentRunLoop];
            [theRunLoop addTimer:self.timer forMode:NSDefaultRunLoopMode];
        }
            break;
        case UIGestureRecognizerStateEnded:
        {
            [self.timer invalidate];
            self.timer = nil;
        }
            break;
        default:
            break;
    }
}

对于 Swift 4,需要更改“func longPress”以使其工作:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var button: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        // add guesture recognizer
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(longPress(_:)))
        self.button.addGestureRecognizer(longPress)

    }

   @objc func longPress(_ guesture: UILongPressGestureRecognizer) {
        if guesture.state == UIGestureRecognizerState.began {
            print("Long Press")
        }
    }

    @IBAction func normalButtonTap(sender: UIButton) {
        print("Button tapped")
    }
}

没有手势的单行回答:

[btn addTarget:self action:@selector(handleTouch:) forControlEvents:UIControlEventTouchDown | UIControlEventTouchUpInside | UIControlEventTouchUpOutside];

详细信息:这会在三个事件上触发您的目标: 1- 手指触摸按钮后立即: UIControlEventTouchDown 这捕获了长按开始。 2 & 3- 当用户抬起手指时: UIControlEventTouchUpOutsideUIControlEventTouchUpInside 这将捕获用户按下的结束。

注意:如果您不关心手势识别器提供的额外信息(例如触摸位置等),这很有效

如果需要,您可以添加更多中间事件,请在此处查看它们https://developer.apple.com/documentation/uikit/uicontrolevents?language=objc

在 Storyboard 中:将您的按钮连接到 3 个事件,而不仅仅是 Storyboard 选择的默认事件(Touch Up Inside)。

故事板中的 3 个事件

我的应用程序有一个子类 UIButton,所以我退出了我的实现。 您可以将其添加到您的子类中,或者这可以像 UIButton 类别一样轻松地重新编码。

我的目标是将长按添加到我的按钮上,而不会使我的视图控制器与所有代码混淆。 我决定在手势识别器 state 开始时调用该操作。

有一个警告出现,我从来没有费心去解决。 说这是可能的泄漏,以为我已经测试了代码并且它没有泄漏。

@interface MYLongButton ()
@property (nonatomic, strong) UILongPressGestureRecognizer *gestureRecognizer;
@property (nonatomic, strong) id gestureRecognizerTarget;
@property (nonatomic, assign) SEL gestureRecognizerSelector;
@end

@implementation MYLongButton

- (void)addLongPressTarget:(CGFloat)interval target:(id)target action:(SEL)selector
{
    _gestureRecognizerTarget = target;
    _gestureRecognizerSelector = selector;
    _gestureRecognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPressGestureRecognizer:)];
    _gestureRecognizer.minimumPressDuration = interval;

    [self addGestureRecognizer:_gestureRecognizer];
}

- (void)handleLongPressGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {
        NSAssert([_gestureRecognizerTarget respondsToSelector:_gestureRecognizerSelector], @"target does not respond to selector");

        self.highlighted = NO;

        // warning on possible leak -- can anybody fix it?
        [_gestureRecognizerTarget performSelector:_gestureRecognizerSelector withObject:self];
    }
}

要分配操作,请将此行添加到您的 viewDidLoad 方法。

[_myLongButton addLongPressTarget:0.75 target:self selector:@selector(longPressAction:)];

动作应该像所有 IBAction 一样定义(没有 IBAction)。

- (void)longPressAction:(id)sender {
    // sender is the button
}

没有工作,因此我尝试在IBAction中编写长按代码或从storyboard中的Controller中单击按钮,而不是在viewDidLoad中编写

- (IBAction)btnClick:(id)sender {

    tag = (int)((UIButton *)sender).tag;

// Long press here instead of in viewDidLoad

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    longPress.cancelsTouchesInView = NO;
    [sender addGestureRecognizer:longPress];

}

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