长按多次调用UIButton的动作

Question

我有2 UIButton个，每个都改变了中间的数字（请参见图片）。

我希望当用户按住按钮时，数字仍然会改变（现在，当你想要从100改为200你需要点击100次而且它不好时，我希望当你按住按钮时数字将会改变），这可能意味着应该一次又一次地调用每个UIButon的动作，直到用户释放按钮。

我该怎么做？谢谢！

Answer 1

你可以在Swift中这样做：

@IBOutlet weak var btn: UIButton!

override func viewDidLoad() {

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(ViewController.Long))  //Tap function will call when user tap on button
    let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.Long)) //Long function will call when user long press on button.

    tapGesture.locationInView(btn);

    btn.addGestureRecognizer(tapGesture)   // To set the tap gesture recognizer: the function Tap () will be calling when the user select the button normally.
    btn.addGestureRecognizer(longGesture)   // To set the long gesture recognizer: the function Long () will be calling when the user select the button with a long press.
}

func Tap() {

    print("Tap happend")
    }

func Long() {

    print("Long press")
    }

Answer 2

你必须使用UILongPressGestureRecognizer这是一个连续的调用动作，而不是通过按钮点击调用方法。所以只需将左/右按钮放在不同的视图中，并将UILongPressGestureRecognizer添加到这些左/右视图中，并将目标添加到这些识别器，例如

{{1}}

希望这能解决您的问题。

Answer 3

在UIButton上使用UILongPressGestureRecognizer

UILongPressGestureRecognizer *LeftButtonPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)];

  UILongPressGestureRecognizer *RightButtonPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)];

  [btnLeft addGestureRecognizer:LeftButtonPress];
  [btnRight addGestureRecognizer:RightButtonPress];

更新屏幕的状态更改代码。

- (void) longPressHandler: (UILongPressGestureRecognizer *) gesture {

    if(gesture.state == UIGestureRecognizerStateChanged) {
// update number on screen

}
}

Answer 4

这是我编写的符合您要求的代码。确保在故事板中链接加号和减号按钮插座及其目标事件（内部触摸）。如果不清楚，请告诉我。

#import "ViewController.h"

@interface ViewController () {

    NSTimer *speedTimer;
}

//Link this in your storyboard Outlets
@property (weak, nonatomic) IBOutlet UILabel *speedUILabel;
@property (weak, nonatomic) IBOutlet UIButton *plusUIButton;
@property (weak, nonatomic) IBOutlet UIButton *minusUIButton;

//Link this in your storyboard events respectively
- (IBAction)plusUIButton:(id)sender;
- (IBAction)minusUIButton:(id)sender;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a     nib.

    UILongPressGestureRecognizer *plusButtonPress =     [[UILongPressGestureRecognizer alloc] initWithTarget:self     action:@selector(longPressHandler:)];

    UILongPressGestureRecognizer *minusButtonPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)];

[_plusUIButton addGestureRecognizer:plusButtonPress];
[_minusUIButton addGestureRecognizer:minusButtonPress];

plusButtonPress.delegate = self;
minusButtonPress.delegate = self;

plusButtonPress.minimumPressDuration = 0.5;
minusButtonPress.minimumPressDuration = 0.5;

plusButtonPress.allowableMovement = 0.5;
minusButtonPress.allowableMovement = 0.5;
}


- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}


- (IBAction)plusUIButton:(id)sender {

NSInteger plus = [_speedUILabel.text integerValue] + 1;
if (plus >= 0) {
    _speedUILabel.text = [NSString stringWithFormat:@"%ld", (long)plus];
}
}

- (IBAction)minusUIButton:(id)sender {

NSInteger minus = [_speedUILabel.text integerValue] - 1;

if (minus >= 0) {
    _speedUILabel.text = [NSString stringWithFormat:@"%ld", (long)minus];
}

}

- (void) longPressHandler: (UILongPressGestureRecognizer *) gesture {

if (gesture.view == _plusUIButton) {

    if(gesture.state == UIGestureRecognizerStateBegan) {
        speedTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(plusUIButton:) userInfo:nil repeats:true];
    }
    else if(gesture.state == UIGestureRecognizerStateEnded) {
        [speedTimer invalidate];
        speedTimer = nil;
    }
}
else if (gesture.view == _minusUIButton) {

    if(gesture.state == UIGestureRecognizerStateBegan) {
        speedTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(minusUIButton:) userInfo:nil repeats:true];
    }
    else if(gesture.state == UIGestureRecognizerStateEnded) {
        [speedTimer invalidate];
        speedTimer = nil;
    }

}
}

@end