iphone - 如何将 UILongPressGestureRecognizer 添加到 UITextField？

Question

我正在尝试将 UILongPressGestureRecognizer 添加到 UITextfield；但是，我似乎无法让它正常运行。我想要的是覆盖默认的长按行为（放大镜和“粘贴”选项），但也保持在文本字段中点击以输入它的能力。使用下面的代码，它仍然会打开放大镜，即使它进入textFieldLongPressed方法，它也永远不会有正确的状态。有任何想法吗？

- (void) addLongPressRecognizer: (UIView *) view
{
    UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc] init];
    [gestureRecognizer addTarget:self action:@selector(textFieldLongPressed:)];
    gestureRecognizer.delegate = self;
    [view addGestureRecognizer: gestureRecognizer];
    self.myGestureReconginzer = gestureRecognizer;
}

- (void) textFieldLongPressed:(UILongPressGestureRecognizer*)sender 
{
    if (sender.state == UIGestureRecognizerStateBegan) 
    {
        [self.delegate textFieldLongPressed:self];
    }
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if(gestureRecognizer == self.myGestureReconginzer)
    {
        //I've tried it with and without the following line
     // [self textFieldLongPressed:(UILongPressGestureRecognizer*) gestureRecognizer];
        return YES;
    }
    else if([gestureRecognizer class] == [UILongPressGestureRecognizer class])
    {
        return NO;
    }
    return YES;
}

Answer 1

尝试将这样的内容添加到您的 UITextField 子类中：

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    if (action == @selector(paste:)) 
        return NO;
    return [super canPerformAction:action withSender:sender];
}

这应该禁用粘贴选项。