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.我明白UILongPressGestureRecognizer但是我怎么能利用这种类型呢？

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,如果您在识别出手势之后几次调用该方法,那么如果您想在其末尾执行某些操作,则必须检查其状态并进行处理.

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,选择发送者类型UILongPressGestureRecognizer.在IBAction使用它的代码中,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
}

或者在Swift中:

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

但我必须承认,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,该答案将使用:

在Objective-C中:

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

或者在Swift中:

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

不同之处在于Ended,当您抬起手指时,您会看到长按的效果.使用时Began,即使在将手指从屏幕上抬起之前,只要系统卡住长按,就会看到长按的效果.

Answer 3

Swift版本的接受答案

我对使用进行了额外的修改,UIGestureRecognizerState.Began而不是.Ended因为这可能是大多数用户自然期望的.尽管如此,试试它们并亲眼看看.

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:下面添加按钮

-(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

我想你需要我的解决方案。

你应该有这个代码用于单击

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

首先，为按钮添加长按手势

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

如果识别到长按手势，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;
    }
}

Answer 6

对于 Swift 4，需要更改“func longPress”才能使其工作：

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")
    }
}