从上到下 Swift 呈现 ViewController

Posted 2023-03-14

【中文标题】从上到下 Swift 呈现 ViewController

【英文标题】：Presenting ViewController from Top to Bottom Swift

【发布时间】：2016-07-04 11:26:22

【问题描述】：

我在谷歌上搜索了一段时间以寻求解决方案。但是没有得到我需要的东西。后来我找到了一个工作相同但以相反方式工作的库，这个库是LNPopupController

我的问题是如何让视图控制器在滑动手势上从上到下移动？我可以调整这个库来实现它吗？

【问题讨论】：

你当然可以调整它，因为它是开源的。随意分叉并实现它。应该没那么难。

【参考方案1】：

您希望根据您链接的项目实施UIPanGesture，而不是UISwipeGesture。

创建一个 UIPanGestureRecognizer

UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(viewDragged:)];

[yourCustomView addGestureRecognizer:panGestureRecognizer];

然后实现“viewDragged:”方法。

heightForTheDraggableRegionLeftInTheView 是当用户试图关闭 youCustomView 时您希望在屏幕上留下多少视图的值。

- (void) viewDragged: (UIPanGestureRecognizer *) gestureRecognizer 
    CGRect viewFrame = gestureRecognizer.view.frame;
    CGPoint locationOfTouch = [gestureRecognizer locationInView:self.view];

    // Let the user's finger match with the bottom of the NotificationView
    [gestureRecognizer.view setFrame:CGRectMake(viewFrame.origin.x, locationOfTouch.y + draggableHeightOfTheNotificationView - viewFrame.size.height, viewFrame.size.width, viewFrame.size.height)];

    // If the yourCustomView is being dragged too high, make sure you leave a draggable area so that the user can drag it later
    if (locationOfTouch.y  >= self.view.frame.size.height - heightForTheDraggableRegionLeftInTheView) 
    [gestureRecognizer.view setFrame:CGRectMake(viewFrame.origin.x, 0, viewFrame.size.width, viewFrame.size.height)];
    

    // If the NotificationView will go to far below the screen keep it resting at the bottom of the screen
    if (locationOfTouch.y <= draggableHeightOfTheNotificationView) 
    [gestureRecognizer.view setFrame:CGRectMake(viewFrame.origin.x, draggableHeightOfTheNotificationView * 2 - self.view.frame.size.height, viewFrame.size.width, viewFrame.size.height)];