iphone - iPhone 应用程序中网页 View 上的手势识别器

Question

我已经创建了一个 webview 来显示 pdf，现在使用单击手势识别器我必须调用一些方法，但单击无法识别

我用过这个代码

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 450,450)];
UITapGestureRecognizer *DoubleFingerDTap = [[UITapGestureRecognizer alloc]
                                           initWithTarget:self action:@selector(screenTappedtwice:)];

DoubleFingerDTap.numberOfTapsRequired = 1;
[webView addGestureRecognizer:DoubleFingerDTap];

[DoubleFingerDTap release];

调用的方法

- (void)screenTappedtwice:(UIGestureRecognizer *)sender {

    CGPoint tapPoint = [sender locationInView:sender.view.superview];


      [UIView beginAnimations:nil context:NULL];

    sender.view.center = tapPoint;

//Check the current state of the navigation bar...
    //BOOL navBarState = [self.navigationController isNavigationBarHidden];
//  Set the navigationBarHidden to the opposite of the current state.
//  [self.navigationController setNavigationBarHidden:TRUE animated:YES];


    [self.navigationController setNavigationBarHidden:YES animated:YES];

    [UIView commitAnimations];


}

Answer 1

您是否尝试过设置:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

返回YES？另外，请确保将点击手势的委托(delegate)设置为 self，以便正确接收消息。我刚刚在一个新项目中对此进行了测试，它确实有效。

编辑

不太确定您的动画开始和提交的用途 - 方法 setNavigationBarHidden:animated: 会自行动画。此外，从 iOS 4 开始，不鼓励使用这些动画定义 - 请考虑在 UIView 上使用基于 block 的动画。

对于您的导航 Controller ，您已经差不多完成了 - 实现如下所示的内容:

- (void)screenTappedTwice:(UITapGestureRecognizer *)sender
{
    BOOL shouldHideNavBar = [self.navigationController isNavigationBarHidden] ? NO : YES;
    [self.navigationController setNavigationBarHidden:shouldHideNavBar animated:YES];
}