Ios 另一个childViewController的childViewController的视图未显示
我对iOS/Swift中的ChildViewController的多级层次结构有问题。当前设置从最低到最高分为三层：Ios 另一个childViewController的childViewController的视图未显示,ios,swift,viewcontroller,childviewcontroller,parentviewcontroller,Ios,Swift,Viewcontroller,Childviewcontroller,Parentviewcontroller,我对iOS/Swift中的ChildViewController的多级层次结构有问题。当前设置从最低到最高分为三层： InfoViewController SelectionViewController MainViewController InfoViewController有一个从XIB加载的视图 SelectionViewController包含一个带有InfoViewController和ui按钮的UIStackView MainViewController是顶级VC，通常嵌入到UINa
InfoViewControllerSelectionViewControllerMainViewControllerInfoViewControllerSelectionViewControllerInfoViewControllerui按钮的UIStackView
MainViewController
是顶级VC，通常嵌入到UINavigationController
中
问题
当我添加InfoViewController
并将其视图直接添加到MainViewController
时，一切都很好
func setupInfoViewControllerDirectlyOnMainVC () {
addChildViewController(infoViewController)
infoViewController.view.embedInside(otherView: infoContainerView)
infoViewController.didMove(toParentViewController: self)
}
但是，如果我使用相同的方法将SelectionViewController
添加到MainViewController
，则嵌入的InfoViewController
不会更新其UI-它看起来总是像它控制的未触及的XIB文件。当它未嵌入此SelectionViewController
中时，其行为与预期一致
如下图所示，UI是可见的，但通过询问其ViewController对其所做的任何更改都不会显示-它看起来与创建它的XIB文件完全相同
下面是从BasicInfoView开始的类设置，后面是上面列出的三个ViewController
基本视图
class PLBasicInfoView: PLDesignableViewFromXib {
//
// MARK: Outlets
//
//
@IBOutlet weak var photoView: PFRoundImageView!
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var subtitleLabel: UILabel!
var imageFile:PFFile? {
didSet {
photoView.file = imageFile
photoView.loadInBackground()
}
}
//
// MARK: Initialization
//
//
override var nameOfXib: String {
return "PLBasicInfoView"
}
override var intrinsicContentSize: CGSize {
return CGSize(width: super.intrinsicContentSize.width, height: 56)
}
}
基本视图控制器
class PLBasicInfoViewController: UIViewController {
/**
The BasicInfoView which will be managed by this controller.
*/
var basicInfoView = PLBasicInfoView()
/**
This is the master stack view which contains all subviews.
*/
var stackView = UIStackView()
/**
PFFile representing the image to be displayed in the imageView. Setting a valid imageFile object automatically laods the image from the server. If set to nil, the defaultImage is displayed instead.
*/
var imageFile: PFFile? {
didSet {
if imageFile != nil {
basicInfoView.imageFile = imageFile
} else {
basicInfoView.photoView.image = defaultImage
}
}
}
/**
Default UIImage to be displayed in the imageView if there is no imageFile assigned.
*/
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-camera-outline")
}
/**
Main text of the infoView
*/
var titleText:String? {
didSet {
basicInfoView.titleLabel.isHidden = (titleText == nil)
basicInfoView.titleLabel.text = titleText
}
}
/**
Secondary text of the infoView. Displays under titleText.
*/
var subtitleText:String? {
didSet {
basicInfoView.subtitleLabel.isHidden = (subtitleText == nil)
basicInfoView.subtitleLabel.text = subtitleText
}
}
/**
Embed our stackView into main view. The custom embedInsider(otherView:UIView) method (UIView extension) will take care of the subview additional as well as all layout constraints.
*/
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
stackView.addArrangedSubview(basicInfoView)
}
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
}
}
class PLSelectableInfoViewController: UIViewController {
/**
If true, the info view will be shown and the selection button will be hidden.
*/
var isAssigned = false {
didSet {
selectionButton.isHidden = isAssigned
infoView.isHidden = !isAssigned
}
}
/**
The View controller dispaying the object in question.
*/
var infoViewController: PLBasicInfoViewController! {
return PLBasicInfoViewController()
}
private
var infoView: UIView!
/**
Button on bottom of stack. Intended to allow user to assign a new value to the contact property.
*/
var selectionButton = PLButton()
/**
Stack view containing all subviews.
*/
var stackView = UIStackView()
//
// MARK: UIViewController Overrides
//
//
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
addInfoView()
}
private
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
}
private
func addInfoView () {
addChildViewController(infoViewController)
infoView = infoViewController.view
stackView.addArrangedSubview(infoView)
infoViewController.didMove(toParentViewController: self)
}
}
选择ViewController
class PLBasicInfoViewController: UIViewController {
/**
The BasicInfoView which will be managed by this controller.
*/
var basicInfoView = PLBasicInfoView()
/**
This is the master stack view which contains all subviews.
*/
var stackView = UIStackView()
/**
PFFile representing the image to be displayed in the imageView. Setting a valid imageFile object automatically laods the image from the server. If set to nil, the defaultImage is displayed instead.
*/
var imageFile: PFFile? {
didSet {
if imageFile != nil {
basicInfoView.imageFile = imageFile
} else {
basicInfoView.photoView.image = defaultImage
}
}
}
/**
Default UIImage to be displayed in the imageView if there is no imageFile assigned.
*/
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-camera-outline")
}
/**
Main text of the infoView
*/
var titleText:String? {
didSet {
basicInfoView.titleLabel.isHidden = (titleText == nil)
basicInfoView.titleLabel.text = titleText
}
}
/**
Secondary text of the infoView. Displays under titleText.
*/
var subtitleText:String? {
didSet {
basicInfoView.subtitleLabel.isHidden = (subtitleText == nil)
basicInfoView.subtitleLabel.text = subtitleText
}
}
/**
Embed our stackView into main view. The custom embedInsider(otherView:UIView) method (UIView extension) will take care of the subview additional as well as all layout constraints.
*/
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
stackView.addArrangedSubview(basicInfoView)
}
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
}
}
class PLSelectableInfoViewController: UIViewController {
/**
If true, the info view will be shown and the selection button will be hidden.
*/
var isAssigned = false {
didSet {
selectionButton.isHidden = isAssigned
infoView.isHidden = !isAssigned
}
}
/**
The View controller dispaying the object in question.
*/
var infoViewController: PLBasicInfoViewController! {
return PLBasicInfoViewController()
}
private
var infoView: UIView!
/**
Button on bottom of stack. Intended to allow user to assign a new value to the contact property.
*/
var selectionButton = PLButton()
/**
Stack view containing all subviews.
*/
var stackView = UIStackView()
//
// MARK: UIViewController Overrides
//
//
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
addInfoView()
}
private
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
}
private
func addInfoView () {
addChildViewController(infoViewController)
infoView = infoViewController.view
stackView.addArrangedSubview(infoView)
infoViewController.didMove(toParentViewController: self)
}
}
一些不相关的代码已被删除
注释
请注意，实际上，BasicInfo ViewController和SelectionViewController都是子类。例如，我有一个ContactInfoViewController，它可以传递一个Contact对象并显示全名、公司名和照片（如上所述，这很好）。还有一个子类SelectionViewController来补充此功能：ContactSelectionViewController。ContactSelectionViewController还有一个Contact对象属性，可以分配该属性，然后将其传递给嵌入式ContactInfoViewController-这是数据不显示的点。我将这些子类包含在下面，以供其他参考
ContactInfoViewController
class PLBasicInfoViewController: UIViewController {
/**
The BasicInfoView which will be managed by this controller.
*/
var basicInfoView = PLBasicInfoView()
/**
This is the master stack view which contains all subviews.
*/
var stackView = UIStackView()
/**
PFFile representing the image to be displayed in the imageView. Setting a valid imageFile object automatically laods the image from the server. If set to nil, the defaultImage is displayed instead.
*/
var imageFile: PFFile? {
didSet {
if imageFile != nil {
basicInfoView.imageFile = imageFile
} else {
basicInfoView.photoView.image = defaultImage
}
}
}
/**
Default UIImage to be displayed in the imageView if there is no imageFile assigned.
*/
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-camera-outline")
}
/**
Main text of the infoView
*/
var titleText:String? {
didSet {
basicInfoView.titleLabel.isHidden = (titleText == nil)
basicInfoView.titleLabel.text = titleText
}
}
/**
Secondary text of the infoView. Displays under titleText.
*/
var subtitleText:String? {
didSet {
basicInfoView.subtitleLabel.isHidden = (subtitleText == nil)
basicInfoView.subtitleLabel.text = subtitleText
}
}
/**
Embed our stackView into main view. The custom embedInsider(otherView:UIView) method (UIView extension) will take care of the subview additional as well as all layout constraints.
*/
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
stackView.addArrangedSubview(basicInfoView)
}
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
}
}
class PLSelectableInfoViewController: UIViewController {
/**
If true, the info view will be shown and the selection button will be hidden.
*/
var isAssigned = false {
didSet {
selectionButton.isHidden = isAssigned
infoView.isHidden = !isAssigned
}
}
/**
The View controller dispaying the object in question.
*/
var infoViewController: PLBasicInfoViewController! {
return PLBasicInfoViewController()
}
private
var infoView: UIView!
/**
Button on bottom of stack. Intended to allow user to assign a new value to the contact property.
*/
var selectionButton = PLButton()
/**
Stack view containing all subviews.
*/
var stackView = UIStackView()
//
// MARK: UIViewController Overrides
//
//
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
addInfoView()
}
private
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
}
private
func addInfoView () {
addChildViewController(infoViewController)
infoView = infoViewController.view
stackView.addArrangedSubview(infoView)
infoViewController.didMove(toParentViewController: self)
}
}
同样，当直接放置到MainViewController中时，它也可以完美地工作
class PLContactInfoViewController: PLBasicInfoViewController {
/**
Contact object managed by this controller.
*/
var contact: PLContact? {
didSet {
if contact == nil {
titleText = "Not Set"
subtitleText = nil
return
}
contact?.fetchIfNeededInBackground(block: { (object, error) in
if let _ = object as? PLContact {
self.updateWithContact()
}
})
}
}
override
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-contact-outline")
}
private
func updateWithContact () {
if let c = contact {
titleText = c.fullName
imageFile = c.photo
c.company?.fetchIfNeededInBackground(block: { (object, error) in
if let comp = object as? PLCompany {
self.subtitleText = comp.name
} else {
self.subtitleText = nil
}
})
}
}
}
class PLContactAssignmentViewController: PLSelectableInfoViewController {
/**
The contact currently selected by this contorller
*/
var selectedContact: PLContact? {
didSet {
isAssigned = !(selectedContact == nil)
contactInfoViewController.contact = selectedContact
}
}
override
var infoViewController: PLBasicInfoViewController! {
return PLContactInfoViewController()
}
private
var contactInfoViewController: PLContactInfoViewController {
return infoViewController as! PLContactInfoViewController
}
}
联系人选择查看控制器
class PLBasicInfoViewController: UIViewController {
/**
The BasicInfoView which will be managed by this controller.
*/
var basicInfoView = PLBasicInfoView()
/**
This is the master stack view which contains all subviews.
*/
var stackView = UIStackView()
/**
PFFile representing the image to be displayed in the imageView. Setting a valid imageFile object automatically laods the image from the server. If set to nil, the defaultImage is displayed instead.
*/
var imageFile: PFFile? {
didSet {
if imageFile != nil {
basicInfoView.imageFile = imageFile
} else {
basicInfoView.photoView.image = defaultImage
}
}
}
/**
Default UIImage to be displayed in the imageView if there is no imageFile assigned.
*/
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-camera-outline")
}
/**
Main text of the infoView
*/
var titleText:String? {
didSet {
basicInfoView.titleLabel.isHidden = (titleText == nil)
basicInfoView.titleLabel.text = titleText
}
}
/**
Secondary text of the infoView. Displays under titleText.
*/
var subtitleText:String? {
didSet {
basicInfoView.subtitleLabel.isHidden = (subtitleText == nil)
basicInfoView.subtitleLabel.text = subtitleText
}
}
/**
Embed our stackView into main view. The custom embedInsider(otherView:UIView) method (UIView extension) will take care of the subview additional as well as all layout constraints.
*/
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
stackView.addArrangedSubview(basicInfoView)
}
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
}
}
class PLSelectableInfoViewController: UIViewController {
/**
If true, the info view will be shown and the selection button will be hidden.
*/
var isAssigned = false {
didSet {
selectionButton.isHidden = isAssigned
infoView.isHidden = !isAssigned
}
}
/**
The View controller dispaying the object in question.
*/
var infoViewController: PLBasicInfoViewController! {
return PLBasicInfoViewController()
}
private
var infoView: UIView!
/**
Button on bottom of stack. Intended to allow user to assign a new value to the contact property.
*/
var selectionButton = PLButton()
/**
Stack view containing all subviews.
*/
var stackView = UIStackView()
//
// MARK: UIViewController Overrides
//
//
override
func viewDidLoad() {
super.viewDidLoad()
setupStackView()
addInfoView()
}
private
func setupStackView () {
stackView.embedInside(otherView: view)
stackView.axis = .vertical
}
private
func addInfoView () {
addChildViewController(infoViewController)
infoView = infoViewController.view
stackView.addArrangedSubview(infoView)
infoViewController.didMove(toParentViewController: self)
}
}
此VC功能正常，但嵌入式ContactInfoViewController不显示数据。由于某些原因，当ContactInfoViewController中的视图嵌入此控制器时，该视图不会用数据更新
class PLContactInfoViewController: PLBasicInfoViewController {
/**
Contact object managed by this controller.
*/
var contact: PLContact? {
didSet {
if contact == nil {
titleText = "Not Set"
subtitleText = nil
return
}
contact?.fetchIfNeededInBackground(block: { (object, error) in
if let _ = object as? PLContact {
self.updateWithContact()
}
})
}
}
override
var defaultImage: UIImage! {
return #imageLiteral(resourceName: "ios7-contact-outline")
}
private
func updateWithContact () {
if let c = contact {
titleText = c.fullName
imageFile = c.photo
c.company?.fetchIfNeededInBackground(block: { (object, error) in
if let comp = object as? PLCompany {
self.subtitleText = comp.name
} else {
self.subtitleText = nil
}
})
}
}
}
class PLContactAssignmentViewController: PLSelectableInfoViewController {
/**
The contact currently selected by this contorller
*/
var selectedContact: PLContact? {
didSet {
isAssigned = !(selectedContact == nil)
contactInfoViewController.contact = selectedContact
}
}
override
var infoViewController: PLBasicInfoViewController! {
return PLContactInfoViewController()
}
private
var contactInfoViewController: PLContactInfoViewController {
return infoViewController as! PLContactInfoViewController
}
}
试一试
或
这可能是因为您每次尝试访问时都会启动PLBasicInfoViewController。我不能从这个问题中看出什么，但我发现Xcode的视图调试功能对于此类问题非常有用，尤其是约束调查。（如果你还没试过。）@PhillipMills这似乎更像是一个参考问题，而不是布局问题。一切显示正确；但是，它的行为就像InfoView与附加到InfoViewController的InfoView不同。抱歉。我误解了“它看起来总是像未触及的XIB”。你真的能在viewcontroller中有一个viewcontroller吗？尝试让父级中的视图重画方法调用子级的视图重画方法？如果将var
声明替换为let infoViewController=PLBasicInfoViewController（）
？