UIButton长新闻活动

Question

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但我怎样才能使用这种类型？

Answer 1

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

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。

Answer 2

作为已接受答案的替代方案，可以使用Interface Builder在Xcode中轻松完成。

只需从对象库拖动长按手势识别器，然后将其放在您想要长按操作的按钮顶部。

接下来，将刚添加的长按手势识别器中的操作连接到视图控制器，选择发件人为UILongPressGestureRecognizer类型。在IBAction的代码中使用此代码，这与接受的答案中建议的代码非常相似：

在 Objective-C ：

中

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

或 Swift ：

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

但是我必须承认，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，该答案将被使用：

在 Objective-C ：

中

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

或 Swift ：

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

与Ended不同的是，当您抬起手指时，您会看到长按的效果。使用Began，即使在您将手指从屏幕上抬起之前，只要长按被系统捕获，您就会看到长按的效果。

Answer 3

接受答案的Swift版本

我使用UIGestureRecognizerState.Began而不是.Ended进行了额外的修改，因为这可能是大多数用户自然期望的。试试这两个并亲自看看。

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")
    }
}

Answer 4

试试这个：

在viewDidLoad:添加按钮，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];
}

现在调用这样的手势方法

-(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 
}

Answer 5

我认为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，将长按手势添加到按钮

- (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，则反复调用单击事件。

- (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;
    }
}

Answer 6

对于Swift 4，＆＃34; func longPress＆＃34;需要改变以使其有效：

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")
    }
}

Answer 7

单行答案，无手势：

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

详细信息： 这将在三个事件上触发您的目标： 1-一旦手指按下按钮UIControlEventTouchDown。这将捕获长按开始。 2＆3-当用户抬起手指时：UIControlEventTouchUpOutside和UIControlEventTouchUpInside。这将捕获用户按下的内容。

注意：如果您不关心手势识别器提供的额外信息（例如触摸的位置等），此方法就很好用

如果需要，您可以添加更多的中间事件，请在https://developer.apple.com/documentation/uikit/uicontrolevents?language=objc中查看它们。

在情节提要中： 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”）。

Answer 8

我的应用程序有一个子类UIButton，所以我已经完成了我的实现。您可以将其添加到子类中，也可以将其重新编码为UIButton类别。

我的目标是将长按添加到我的按钮，而不会使我的视图控制器与所有代码混乱。我已经决定在手势识别器状态开始时应该调用该动作。

有一个警告，表明我从未打扰过要解决。说这是一个可能的泄漏，我认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];
    }
}

要指定操作，请将此行添加到viewDidLoad方法。

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

应该像所有IBAction一样定义动作（没有IBAction）。

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

Answer 9

没有效果，因此我尝试在IBAction中编写longpress代码或在storyboard中的Controller点击按钮，而不是写入viewDidLoad

- (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];

}