Swift iOS-使用SegmentedControl将ChildViewController添加到CollectionView部分
我有一个视图控制器,它包含一个带有2个部分的collectionView。第二节的标题是粘性标题,其中有一个segmentedControl:Swift iOS-使用SegmentedControl将ChildViewController添加到CollectionView部分,ios,swift,uicollectionview,uisegmentedcontrol,childviewcontroller,Ios,Swift,Uicollectionview,Uisegmentedcontrol,Childviewcontroller,我有一个视图控制器,它包含一个带有2个部分的collectionView。第二节的标题是粘性标题,其中有一个segmentedControl: ParentViewController --collectionView --sectionOne // because there is specific data in sectionOne I cannot use a PageViewController --sectionTwo
ParentViewController
--collectionView
--sectionOne // because there is specific data in sectionOne I cannot use a PageViewController
--sectionTwo
sectionTwoHeader // sticky header
[RedVC, BlueVC, GreenVC] // these should be the size of sectionTwo
选择一个段后,我将使用ContainerVC,它将显示对应于每个段的视图控制器:
// each of of these color vcs have collectionViews inside of them
RedCollectionViewController(), BlueCollectionViewController(), GreenCollectionViewController()
问题是,当选定段时,collectionView没有显示它应该显示的任何颜色视图控制器如何使用addChildViewController()将每种颜色的vc添加到collectionView?
带有分段控件的selectedIndex的collectionView:
class ParentViewController: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
var collectionView: UICollectionView!
var containerController: ContainerController!
var vc: UIViewController!
override func viewDidLoad() {
super.viewDidLoad()
containerController = ContainerController()
}
@objc func selectedIndex(_ sender: UISegmentedControl){
let index = sender.selectedSegmentIndex
switch index {
case 0:
containerController.vcIdentifierReceivedFromParent(segment: "BlueVC")
break
case 1:
containerController.vcIdentifierReceivedFromParent(segment: "RedVC")
break
case 2:
containerController.vcIdentifierReceivedFromParent(segment: "GreenVC")
break
default: break
}
/*
// because of the X and Y values this adds the containerVC over the collectionView instead of under the sectionTwo segmented Control header
vc = containerController
addChildViewController(vc)
vc.view.frame = CGRect(x: 0,y: 0, width: collectionView.frame.width,height: collectionView.frame.height)
view.addSubview(vc.view)
vc.didMove(toParentViewController: self)
lastViewController = vc
*/
}
}
ContainerVC:
class ContainerController: UIViewController {
var vc: UIViewController!
var lastViewController: UIViewController!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
vcIdentifierReceivedFromParent(segment: "RedVC")
}
func vcIdentifierReceivedFromParent(segment: String){
switch segment {
case "RedVC":
let redVC = RedCollectionViewController()
addVcToContainer(destination: redVC)
break
case "BlueVC":
let blueVC = BlueCollectionViewController()
addVcToContainer(destination: blueVC)
break
case "GreenVC":
let greenVC = GreenCollectionViewController()
addVcToContainer(destination: greenVC)
break
default: break
}
}
func addVcToContainer(destination: UIViewController) {
//Avoids creation of a stack of view controllers
if lastViewController != nil{
lastViewController.view.removeFromSuperview()
}
self.vc = destination
addChildViewController(vc)
vc.view.frame = CGRect(x: 0,y: 0, width: view.frame.width,height: view.frame.height)
view.addSubview(vc.view)
vc.didMove(toParentViewController: self)
lastViewController = vc
}
}
您正在将红色/蓝色/绿色VCs添加到从ParentViewController内部引用的容器视图控制器。但您正在ContainerVC最上面的视图中添加它们中的每一个,就我从您的代码中看到的情况来看,其
框架可能从未设置过
它可能是CGRectZero
将子VC视图添加到此视图将导致它们被错误定位,或者根本没有定位。因为容器视图控制器不在视图控制器层次结构中。实际上,您正在ParentViewController的viewDidLoad()中执行所有操作。最有可能的是,ContainerVC的viewDidLoad
甚至没有被调用。因此,它的观点从未被正确地初始化过
您可能根本不需要ContainerVC。尝试将子项添加到ParentViewController,并尝试在调用viewDidLoad()
后添加子项,即在ViewDidDisplay()
、viewDidLayoutSubviews()
和切换段选择时添加子项。为什么选择collectionVC?为什么不使用UIPageViewController?嘿,谢谢你的帮助。我想,因为我有分段控件,每个分段都显示了一个不同的集合视图,分段控件是最好使用的。使用它有什么问题吗?您有let containerController=containerController()
和var containerController:containerController代码>在随后的语句中!而且,var containerController
未在输入错误的ViewDidLoad
中初始化。我会修好的。我没有添加viewDidLoad,因为将代码放在那里并没有什么区别,因为不管它在那里初始化,这都是100%编程的。请阅读我上面的评论。由于第一节的原因,我实际上必须使用集合视图