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我想在持有带有 a的 aUISlider时连续更改 a 的值。现在我只在触地和触地（开始/结束）时接到我的代表的电话。UIButtonUILongPressGestureRecognizerUILongPressGestureRecognizer

我可以在不绑定 UI的情况下执行从UIGestureRecognizerStateBegan到到的操作吗？UIGestureRecognizerStateEnded正如预期的那样，使用while()循环不起作用。

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这是一个工作示例，说明如何完成您正在寻找的内容。我对其进行了测试并且效果很好。

所有这些代码都在 *.m 文件中。这是一个非常简单的类，只是扩展UIViewController。

#import "TSViewController.h"

@interface TSViewController ()

@property (nonatomic, strong) NSTimer *longPressTimer;

@end

@implementation TSViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
    [self.view addGestureRecognizer:longPress];
}

-(void)longPressGesture:(UILongPressGestureRecognizer*)longPress {

    // The long press gesture recognizer has been, well, recognized
    if (longPress.state == UIGestureRecognizerStateBegan) {

        if (self.longPressTimer) {
            [self.longPressTimer invalidate];
            self.longPressTimer = nil;
        }

        // Here you can fine-tune how often the timer will be fired. Right
        // now it's been fired every 0.5 seconds
        self.longPressTimer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(longPressTimer:) userInfo:nil repeats:YES];
    }

    // Since a long press gesture is continuous you have to detect when it has ended
    // or when it has been cancelled
    if (longPress.state == UIGestureRecognizerStateEnded || longPress.state == UIGestureRecognizerStateCancelled) {
        [self.longPressTimer invalidate];
        self.longPressTimer = nil;
    }
}

-(void)longPressTimer:(NSTimer*)timer {

    NSLog(@"User is long-pressing");
}

@end

希望这可以帮助！

于 2013-10-17T21:14:09.900 回答