如何从Pan手势触发Segue？

Question

我在StoryBoard的UIViewController上设置了以下平移手势代码。

在ViewDidLoad中：

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
[self.view addGestureRecognizer:panRecognizer];

然后我有以下称呼：

#pragma mark - GESTURE RECOGNIZERS

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
CGPoint velocity = [panRecognizer velocityInView:self.view];

NSLog(@"Pan Detected.");

if(velocity.x > 0)
{
    NSLog(@"Pan went right.");
}
else
{
    NSLog(@"Pan went left.");

    if (panRecognizer.state == UIGestureRecognizerStateChanged)
        NSLog(@"State Changed.");
}
}

当我从左向右拖动手指时，上面的代码将触发。 我希望它仅在我从屏幕右侧拖动时触发。 然后，我想选择到另一个StoryBoard上的UIViewController。 （我想将设置屏幕上的模态从右边缘拖动到应用程序的主屏幕上）。 设置UIViewController仅需要部分拖动到屏幕上。

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
NSLog(@"prepareForSegue: %@", segue.identifier);
if([segue.identifier isEqualToString:@"Settings"])
{
    NSLog(@"Show Settings View Controller");
    OLStoryboardLink *storyboardLink = segue.destinationViewController;
    //send the string
    storyboardLink.setStoryboardName = @"Settings";
    storyboardLink.transitioningDelegate  = self;
    [self presentViewController:storyboardLink animated:YES completion:nil];
}
}

如何从屏幕右侧的平移手势触发segue？

Answer 1

从情节提要A中的viewController到情节提要B中的viewController不能执行Segues。要使用segues，两个viewController必须位于同一Storyboard中。

但是要回答这个问题，您可以通过调用performSegueWithIdentifier ：方法来触发segue：

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
    CGPoint velocity = [panRecognizer velocityInView:self.view];

    NSLog(@"Pan Detected.");

    if (velocity.x > 0)
    {
        NSLog(@"Pan went right.");
    }
    else
    {
        NSLog(@"Pan went left.");     

        if (panRecognizer.state == UIGestureRecognizerStateChanged)
            NSLog(@"State Changed.");

        [self performSegueWithIdentifier:@"Settings" sender:panRecognizer];
    }
}

有关更多信息，请参阅Apple的参考。