ios 如何让 UITextView 检测到一键点击？

Question

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"touchesBegan");

    //test
    UITouch *touch = [event allTouches] anyObject];
    if ([touch tapCount] == 2) {
        NSLog (@"tapcount 2");
        [self.textview becomeFirstResponder];

    }   

     else if ([touch tapCount] == 1) {
         NSLog (@"tapcount 1");
         [self.textview becomeFirstResponder];
         [self.view performSelector:@selector(select:)];


     }

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesBegan:touches withEvent:event];
    NSLog(@"touchesMoved");
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"****touchesEnded");
    [self.nextResponder touchesEnded: touches withEvent:event]; 
    NSLog(@"****touchesEnded");
    [super touchesEnded:touches withEvent:event];
    NSLog(@"****touchesEnded");
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
    [super touchesCancelled:touches withEvent:event]; 
    NSLog(@"touchesCancelled");
}

我的问题：

我想在UITextView 上点击一次时模拟两次点击，这是这段代码中的文本视图。但是当我在 textview 上点击一次或两次时，我不会从一次和两次点击中获得 NSLog，只是在它之外。我应该怎么做才能让它发挥作用？

Answer 1

我可能会在这里使用两个gesture recognizers。

//...some stuff above here probably in you're controllers viewDidLoad

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapRecognized:)];
singleTap.numberOfTapsRequired = 1;
[someTextView addGestureRecognizer:singleTap];
[singleTap release];

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapRecognized:)];
doubleTap.numberOfTapsRequired = 2;
[someTextView addGestureRecognizer:doubleTap];
[doubleTap release];

选择器就像：

- (void)singleTapRecognized:(UIGestureRecognizer *)gestureRecognizer {
    NSLog(@"single tap");
    // ...etc
}

- (void)doubleTapRecognized:(UIGestureRecognizer *)gestureRecognizer {
    NSLog(@"double tap");
    // ...etc
}

Answer 2

我遇到了一个类似的问题，我想在不编辑底层文本的情况下捕获对 textView 的点击。

此答案适用于 Swift 3.0。

对于我的解决方案，我实现了 textView 委托方法 textViewShouldBeginEditing 并为该值返回 false。这让我可以在没有任何额外开销的情况下捕获 textView 上的点击。

extension ViewController: UITextViewDelegate {
    func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
        // Do something

        return false
    }
}

请务必在您的 ViewController 类中指定 textView 以使用委托。

Answer 3

我遇到了同样的问题，其他答案对我不起作用。所以这就是我所做的。

我像另一个答案建议的那样附加了手势。然后我确保调用了选择的委托方法。我确实尝试过简单地选择单元格，但这并没有触发委托方法。我相信只有用户交互会导致调用委托方法，所以这段代码模仿了这种行为。

https://gist.github.com/brennanMKE/e89bf7a28d96812d6a22

@implementation TappableTextView

- (instancetype)init {
    self = [super init];
    if (self) {
        [self setup];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (self) {
        [self setup];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}

- (void)setup {
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapRecognized:)];
    singleTap.numberOfTapsRequired = 1;
    [self addGestureRecognizer:singleTap];
}

- (void)singleTapRecognized:(id)sender {
    UIView *superview = self.superview;

    UICollectionViewCell *cell = nil;
    NSIndexPath *indexPath = nil;

    while (superview) {
        if ([superview isKindOfClass:[UICollectionViewCell class]]) {
            cell = (UICollectionViewCell *)superview;
        }

        if ([superview isKindOfClass:[UICollectionView class]] && cell) {
            UICollectionView *collectionView = (UICollectionView *)superview;
            indexPath = [collectionView indexPathForCell:cell];
            NSAssert(collectionView.delegate, @"Delegate must be defined");
            NSAssert([collectionView.delegate respondsToSelector:@selector(collectionView:didSelectItemAtIndexPath:)], @"Selection must be supported");
            if (indexPath && [collectionView.delegate respondsToSelector:@selector(collectionView:didSelectItemAtIndexPath:)]) {
                [collectionView.delegate collectionView:collectionView didSelectItemAtIndexPath:indexPath];
            }

            return;
        }

        superview = superview.superview;
    }
}

@end