ios - 长按多次调用 UIButton 的操作

Question

我有 2 个 UIButton，每个按钮都会更改中间的数字(请参见图片)。

我希望当用户按住按钮时数字仍然会发生变化(现在，当你想从 100 更改为 200 时，你需要点击 100 次，这不好，我希望当你按住按钮时数字将会改变)，这可能意味着每个 UIButon 的操作应该被一次又一次地调用，直到用户释放按钮。

我该怎么做？谢谢!

Answer 1

这是我编写的符合您要求的代码。确保在 Storyboard中链接加号和减号按钮导出及其目标事件(内部修饰)。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