objective-c - 在 scrollView 中延迟滚动

Question

是否可以在 UIScrollView 中延迟滚动?我知道，它已经延迟了，但我想增加延迟的时间间隔。有没有办法在不覆盖 handlePan: 的情况下做到这一点？ ScrollView 的 panGestureRecognizer ?

Answer 1

你可以试试这个:

创建一个 DelayGestureRecognizer类(class)

#import <UIKit/UIGestureRecognizerSubclass.h>

@interface DelayGestureRecognizer : UIGestureRecognizer

@end

@implementation DelayGestureRecognizer

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];

    double delayInSeconds = 1.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        self.state = UIGestureRecognizerStateFailed;
    });
}

@end

然后，当您设置 UIScrollView 时:

DelayGestureRecognizer *delayGestureRecognizer = [DelayGestureRecognizer new];
[scrollView addGestureRecognizer:delayGestureRecognizer];
[scrollView.panGestureRecognizer requireGestureRecognizerToFail:delayGestureRecognizer];

(您明白了……实际上，最好使用计时器并使 UIGestureRecognizer 的 - reset 方法中的计时器无效，以防手势识别器在不到第二...)