Swift：添加子视图时视图的框架发生变化

Posted 2023-03-13

【中文标题】Swift：添加子视图时视图的框架发生变化

【英文标题】：Swift : View's frame getting altered when a subview is added

【发布时间】：2016-03-23 01:39:45

【问题描述】：

我在一个向上滑动的视图中有一个集合视图和两个容器视图（我们称之为 menugrid）。当 menugrid 向上滑动时，框架被设置为覆盖整个屏幕。我正在尝试构建一个功能，用户可以将 UICollectionView 单元格拖放到容器视图上。当我开始拖放时，menugrid 视图会返回到屏幕底部的初始位置。

这里是一些代码：

func handlePanForCell(gestureRecognizer: UILongPressGestureRecognizer) 

        let pressPoint: CGPoint =  gestureRecognizer.locationInView(gestureRecognizer.view)
        let localPoint : CGPoint = self.menuGridView.convertPoint(pressPoint, fromView: gestureRecognizer.view!)
        var cell : MenugridCollectionViewCell  = MenugridCollectionViewCell()
        if(gestureRecognizer.view is UICollectionViewCell)
            if (gestureRecognizer.state == UIGestureRecognizerState.Began) 
                cell  =  gestureRecognizer.view as! MenugridCollectionViewCell
                UIGraphicsBeginImageContext(cell.bounds.size);
                cell.layer.renderInContext(UIGraphicsGetCurrentContext()!)
                let cellImage : UIImage = UIGraphicsGetImageFromCurrentImageContext();
                UIGraphicsEndImageContext();
                self.movingCell =  UIImageView.init(image: cellImage)
                self.movingCell?.alpha = 0.75
                //let cellFrameInSuperview : CGRect =  self.menuGridCollectionView.convertRect(cell.frame, toView: self.menuGridView)
                self.movingCell?.center =  localPoint
                //self.movingCell?.frame = cellFrameInSuperview
                self.view.addSubview(self.movingCell!)
            
            if (gestureRecognizer.state == UIGestureRecognizerState.Changed) 
                self.movingCell?.center = localPoint
                setMenuGridViewOnTop()
            
            if (gestureRecognizer.state == UIGestureRecognizerState.Ended) 

                // Check to see if the drop area is in the personalized info-area
                let isContaining =  self.menuGridView.convertRect(self.firstContainerView.frame, toView: self.menuGridView).contains(self.movingCell!.frame) || self.middleView.convertRect(self.secondInfoView.frame, toView: self.menuGridView).contains(self.movingCell!.frame)
                if isContaining
                
                    if(self.middleView.convertRect(self.firstInfoView.frame, toView: self.view).contains(self.movingCell!.frame)) 
                        //let index = self.findIndexOfViewController(self.infoViewArray[0])
                        //let oldViewController : UIViewController = self.childViewControllers[Int(index)] as UIViewController
                        self.switchInfoViews(nil, toView: (gestureRecognizer.view as! MenugridCollectionViewCell).name!, atPosition: 0, parentView: "menuGridView")
                    
                    else 
                        self.switchInfoViews(nil, toView: (gestureRecognizer.view as! MenugridCollectionViewCell).name!, atPosition: 1, parentView: "menuGridView")
                    
                    //self.movingCell?.removeFromSuperview()
                
                self.movingCell?.removeFromSuperview()
                self.movingCell = nil
                //setMenuGridViewOnTop()

                //self.view.viewWithTag(1000)?.removeFromSuperview()
                //self.view.viewWithTag(1001)?.removeFromSuperview()
                //self.middleView.alpha = 1
                //self.childViewControllers[0].view.alpha = 1
                //self.childViewControllers[1].view.alpha = 1
                //self.topView.alpha = 1
            
        
        //setMenuGridViewOnTop()
    



//MARK: -  Switch Views
    func switchInfoViews(fromViewController : UIViewController?, toView : String, atPosition : CGFloat, parentView : String) 

        var newViewController : InfoViewController = InfoViewController()
        var storyBoardIdOfNewView =  String()
        if(toView == "Doctor")
            newViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ProviderSearchInfoViewControllerID") as! ProviderSearchInfoViewController
            storyBoardIdOfNewView = "ProviderSearchInfoViewControllerID"
        
        else if(toView == "PayBill")
            newViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("PayBillInfoViewControllerID") as! PayBillInfoViewController
            storyBoardIdOfNewView = "PayBillInfoViewControllerID"
        
        else if(toView == "Symptoms")
            newViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("SymptomsInfoViewControllerID") as! SymptomsInfoViewController
            storyBoardIdOfNewView = "SymptomsInfoViewControllerID"
        
        else if(toView == "Handouts")
            newViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("PatientHandoutInfoViewControllerID") as! PatientHandoutInfoViewController
            storyBoardIdOfNewView = "PatientHandoutInfoViewControllerID"
        
        else if(toView == "FirstAid")
            newViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("FirstAidInfoViewControllerID") as! FirstAidInfoViewController
            storyBoardIdOfNewView = "FirstAidInfoViewControllerID"
        

        if(parentView == "menuGridView") 

                let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier(storyBoardIdOfNewView)
                if(atPosition == 0)
                    self.firstContainerView.subviews.forEach( $0.removeFromSuperview() )
                    viewController.view.frame = CGRectMake(0, 0, (self.menuGridView.frame.width / 2) - 3, self.menuGridView.frame.height * 0.3)//self.firstContainerView.frame
                    self.firstContainerView.addSubview(viewController.view)
                
                else 
                    self.secondContainerView.subviews.forEach( $0.removeFromSuperview() )
                    viewController.view.frame = CGRectMake(0, 0, (self.menuGridView.frame.width / 2) - 3, self.menuGridView.frame.height * 0.3)//self.secondContainerView.frame
                    self.secondContainerView.addSubview(viewController.view)
                
            if(self.menuAtTop)
                self.setMenuGridViewOnTop()
            
            
            else if(parentView == "middleView")

                if(!self.checkIfViewControllerIsAlreadyDisplayed(newViewController))
                
                    fromViewController?.willMoveToParentViewController(nil)
                    fromViewController?.view.removeFromSuperview()
                    fromViewController?.removeFromParentViewController()
                    self.movingCell?.removeFromSuperview()
                    newViewController.view.frame = CGRectMake(0 + atPosition * self.middleView.frame.size.width / 2, 0 , self.middleView.frame.size.width / 2, self.middleView.frame.size.height)
                    self.middleView.addSubview(newViewController.view)
                    self.addChildViewController(newViewController)
                    newViewController.didMoveToParentViewController(self)
                    if(self.infoViewArray.count > 0) 
                        self.infoViewArray.removeAtIndex(Int(atPosition))
                        self.infoViewArray.insert(toView, atIndex: Int(atPosition))
                    
                
            
    

可能是什么原因造成的？我很困惑为什么会发生这种情况，并希望能提供任何帮助。谢谢。

【问题讨论】：

视图上没有设置自动布局。布局正在代码中设置。

【参考方案1】：

我通过从项目中删除 AutoLayout 并求助于在代码中设置布局解决了这个问题。

我仍然想知道为什么会这样，因为这有助于我更好地理解 AutoLayout。