ISplitViewController：DetailViewController 可以从 MasterVIewController 加载数据而不返回吗？
ISplitViewController: Can DetailViewController load data from MasterVIewController without segueing back?
业余爱好者。我使用 UISplitViewController 创建了一个 iOS Swift 应用程序。到目前为止效果很好。
我希望能够在查看 DetailViewController 视图的同时加载存储在 MasterViewController 中的数据，而无需返回到 MasterViewContoler 视图并选择那里显示的 UITableView 中的项目。呸，多啰嗦，我希望这是有道理的。这可能吗？我不确定如何进行。这些图片可能会更好地解释：
Detail View
Master View
我已经阅读了这些问题：getting the MasterViewController from the DetailViewController in a UISplitViewController app and SplitView - reload data in master tableView based on detail changed in swift 但它们并不是我想要的。
这是我的 DetailViewController 代码：
import UIKit
import SafariServices
class DetailViewController: UIViewController {
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var stackView: UIStackView!
@IBOutlet weak var detailDescriptionLabel: UILabel!
@IBOutlet weak var compareToButton: UIButton!
@IBAction func compareToButtonTapped(_ sender: Any) {
//do something here?
}
@IBOutlet weak var pathologyImageViewOne: UIImageView!
@IBOutlet weak var pathologyImageViewTwo: UIImageView!
@IBOutlet weak var detailUsedLabel: UILabel!
@IBOutlet weak var detailReferenceLabel: UILabel!
@IBOutlet weak var detailPhotoOneCaptionLabel: UILabel!
@IBOutlet weak var detailPhotoTwoCaptionLabel: UILabel!
var caseIDOne = 0
var caseIDTwo = 0
var compareToButtonString = "Hello"
func configureView() {
// Update the user interface for the detail item.
if let detail = detailItem {
if let detailDescriptionLabel = detailDescriptionLabel,
let compareToButton = compareToButton,
let detailUsedLabel = detailUsedLabel,
let pathologyImageViewOne = pathologyImageViewOne,
let pathologyImageViewTwo = pathologyImageViewTwo,
let detailReferenceLabel = detailReferenceLabel,
let detailPhotoOneCaptionLabel = detailPhotoOneCaptionLabel,
let detailPhotoTwoCaptionLabel = detailPhotoTwoCaptionLabel {
title = detail.name
caseIDOne = detail.caseIDOne
caseIDTwo = detail.caseIDTwo!
detailDescriptionLabel.text = detail.description
compareToButtonString = detail.compareTo!
UIView.performWithoutAnimation {
compareToButton.setTitle("\(compareToButtonString)", for: .normal)
}
detailUsedLabel.text = detail.used
detailReferenceLabel.text = detail.reference
pathologyImageViewOne.image = UIImage(named: detail.photoOne)
pathologyImageViewOne.layer.cornerRadius = 4
pathologyImageViewOne.contentMode = .scaleAspectFill
pathologyImageViewOne.clipsToBounds = true
pathologyImageViewTwo.image = UIImage(named: detail.photoTwo!)
pathologyImageViewTwo.layer.cornerRadius = 4
pathologyImageViewTwo.contentMode = .scaleAspectFill
pathologyImageViewTwo.clipsToBounds = true
// The image in the foreground
let frontImage = UIImage(named: "tap-icon")
// Create the view holding the image
let frontImageViewOne = UIImageView(image: frontImage)
// The size and position of the front image
frontImageViewOne.frame = CGRect(x: 0 , y: 0, width: 34, height: 42)
// turn off AutoresingMask
frontImageViewOne.translatesAutoresizingMaskIntoConstraints = false
// change alpha
frontImageViewOne.alpha = 0.8
// Create the view holding the image again
let frontImageViewTwo = UIImageView(image: frontImage)
// The size and position of the front image again
frontImageViewTwo.frame = CGRect(x: 0 , y: 0, width: 34, height: 42)
// turn off AutoresingMask again
frontImageViewTwo.translatesAutoresizingMaskIntoConstraints = false
// change alpha again
frontImageViewTwo.alpha = 0.8
//MARK: Image One
// Add the front image on top of the background
pathologyImageViewOne.addSubview(frontImageViewOne)
NSLayoutConstraint.activate([
//place the tap icon at the bottom right of parent
frontImageViewOne.bottomAnchor.constraint(equalTo: pathologyImageViewOne.bottomAnchor, constant: -10),
frontImageViewOne.centerXAnchor.constraint(equalTo: pathologyImageViewOne.rightAnchor, constant: -24)
])
let tapGestureRecognizerOne = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizerOne:)))
pathologyImageViewOne.isUserInteractionEnabled = true
pathologyImageViewOne.addGestureRecognizer(tapGestureRecognizerOne)
//MARK: Image two
// Add the front image on top of the background
pathologyImageViewTwo.addSubview(frontImageViewTwo)
NSLayoutConstraint.activate([
//place the tap icon at the bottom right of parent
frontImageViewTwo.bottomAnchor.constraint(equalTo: pathologyImageViewTwo.bottomAnchor, constant: -10),
frontImageViewTwo.centerXAnchor.constraint(equalTo: pathologyImageViewTwo.rightAnchor, constant: -24)
])
let tapGestureRecognizerTwo = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizerTwo:)))
pathologyImageViewTwo.isUserInteractionEnabled = true
pathologyImageViewTwo.addGestureRecognizer(tapGestureRecognizerTwo)
detailPhotoOneCaptionLabel.text = detail.photoOneCaption
detailPhotoTwoCaptionLabel.text = detail.photoTwoCaption
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
configureView()
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.layoutMargins = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
stackView.isLayoutMarginsRelativeArrangement = true
scrollView.addSubview(stackView)
stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
stackView.topAnchor.constraint(equalTo: self.scrollView.topAnchor).isActive = true
stackView.bottomAnchor.constraint(equalTo: self.scrollView.bottomAnchor).isActive = true
}
var detailItem: Descriptor? {
didSet {
// Update the view.
configureView()
}
}
func showWebsite(_ whichCase: Int) {
if let url = URL(string: "https://digitalpathology.uct.ac.za/case_detail.php?case_id=\(whichCase)") {
let config = SFSafariViewController.Configuration()
config.entersReaderIfAvailable = true
let vc = SFSafariViewController(url: url, configuration: config)
present(vc, animated: true)
}
}
@objc func imageTapped(tapGestureRecognizerOne: UITapGestureRecognizer)
{
showWebsite(caseIDOne)
print("Image tapped")
print("CaseOne ID = \(caseIDOne)")
}
@objc func imageTapped(tapGestureRecognizerTwo: UITapGestureRecognizer)
{
showWebsite(caseIDTwo)
print("Image tapped")
print("CaseTwo ID = \(caseIDTwo)")
}
}
我编辑的（为简洁起见）MasterViewController 代码：
import UIKit
class MasterViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchFooter: SearchFooter!
var detailViewController: DetailViewController? = nil
var descriptors = [Descriptor]()
var filteredDescriptors = [Descriptor]()
let searchController = UISearchController(searchResultsController: nil)
fileprivate var collapseDetailViewController = true
// MARK: - view setup
override func viewDidLoad() {
super.viewDidLoad()
// Setup the Search Controller
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search Descriptors"
navigationItem.searchController = searchController
definesPresentationContext = true
//delagate and data source commented out, connected in storyboard
//tableView.delegate = self
//tableView.dataSource = self
// The data
descriptors = [
Descriptor(name:"Friable", description:"Easily crumbled. Said of tissue that readily tears, fragments, or bleeds when gently palpated or manipulated.", photoOne: "Friable", photoOneCaption:"Subacute bacterial edocarditis", used:"Used in relation to – heart valve vegetations, brittle carcinomatous tissue esp. of cervix.", reference: "Ref: DMD", caseIDOne:769),
Descriptor(name:"Hypertrophic / Hypertrophied", description:"An enlarged, overgrown or bulky organ or part, on account of an increase in the size of its cells (compare ‘hyperplastic’).", compareTo: "Hyperplastic", photoOne: "Hypertrophic1", photoOneCaption:"The heart in hypertension", photoTwo: "Hypertrophic2", photoTwoCaption:"The heart in hypertension", used:"Used in relation to – over-exercised muscles or muscular organs such as heart, bladder, stomach.", reference: "Ref: FPMD", caseIDOne:833, caseIDTwo:833),
Descriptor(name:"Hyperplastic", description:"An enlarged or expanded organ or part, on account of an increase in the formation and number of normal cells (compare ‘hypertrophy’). Hyperplastic expansion may be uniform or nodular.", compareTo: "Hypertrophy", photoOne: "Hyperplastic", photoOneCaption:"Hyperplastic gastropathy in Zollinger-Ellison syndrome", used:"Used in relation to - a benign expansion of the prostate, an endo- or epithelium, lymph node, gums or endocrine glands, usually reflecting hyper-stimulation of some cause.", reference: "Ref: MKEDMNAH", caseIDOne:555),]
if let split = splitViewController {
let controllers = split.viewControllers
detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
}
//splitViewController?.delegate = self as? UISplitViewControllerDelegate
splitViewController?.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
if splitViewController!.isCollapsed {
if let selectionIndexPath = self.tableView.indexPathForSelectedRow {
self.tableView.deselectRow(at: selectionIndexPath, animated: animated)
}
}
//lets sort the array of objects so A comes before Z
descriptors.sort { [=11=].name.compare(.name) == .orderedAscending }
self.tableView.reloadData()
super.viewWillAppear(animated)
}
// MARK: - Segues
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let descriptor: Descriptor
if isFiltering() {
descriptor = filteredDescriptors[indexPath.row]
} else {
descriptor = descriptors[indexPath.row]
}
let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
controller.detailItem = descriptor
collapseDetailViewController = false
controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
let backItem = UIBarButtonItem()
backItem.title = "Pathology A-Z"
navigationItem.backBarButtonItem = backItem
}
}
}
// MARK: - Table View
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if isFiltering() {
searchFooter.setIsFilteringToShow(filteredItemCount: filteredDescriptors.count, of: descriptors.count)
return filteredDescriptors.count
}
searchFooter.setNotFiltering()
return descriptors.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let descriptor: Descriptor
if isFiltering() {
descriptor = filteredDescriptors[indexPath.row]
} else {
descriptor = descriptors[indexPath.row]
}
cell.textLabel!.text = descriptor.name
cell.detailTextLabel!.text = descriptor.description
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return false
}
extension MasterViewController: UISplitViewControllerDelegate {
func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool {
return collapseDetailViewController
}
}
您应该为默认情况准备一个方法。比如说，在 DetailViewController 中声明 detailDefaultItem 并在 configureView() 之前分配给 viewDidLoad 中的 detailItem （只需删除它，因为它已经调用 didSet detailItem):
override func viewDidLoad() {
super.viewDidLoad()
var detailDefaultItem = Descriptor()
// set/configure needed default values in `Descriptor` class or here below
// detailDefaultItem.property = someValue
// ...
detailItem = detailDefaultItem
// configureView()
...
}
业余爱好者。我使用 UISplitViewController 创建了一个 iOS Swift 应用程序。到目前为止效果很好。 我希望能够在查看 DetailViewController 视图的同时加载存储在 MasterViewController 中的数据，而无需返回到 MasterViewContoler 视图并选择那里显示的 UITableView 中的项目。呸，多啰嗦，我希望这是有道理的。这可能吗？我不确定如何进行。这些图片可能会更好地解释：
Detail View
Master View
我已经阅读了这些问题：getting the MasterViewController from the DetailViewController in a UISplitViewController app and SplitView - reload data in master tableView based on detail changed in swift 但它们并不是我想要的。
这是我的 DetailViewController 代码：
import UIKit
import SafariServices
class DetailViewController: UIViewController {
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var stackView: UIStackView!
@IBOutlet weak var detailDescriptionLabel: UILabel!
@IBOutlet weak var compareToButton: UIButton!
@IBAction func compareToButtonTapped(_ sender: Any) {
//do something here?
}
@IBOutlet weak var pathologyImageViewOne: UIImageView!
@IBOutlet weak var pathologyImageViewTwo: UIImageView!
@IBOutlet weak var detailUsedLabel: UILabel!
@IBOutlet weak var detailReferenceLabel: UILabel!
@IBOutlet weak var detailPhotoOneCaptionLabel: UILabel!
@IBOutlet weak var detailPhotoTwoCaptionLabel: UILabel!
var caseIDOne = 0
var caseIDTwo = 0
var compareToButtonString = "Hello"
func configureView() {
// Update the user interface for the detail item.
if let detail = detailItem {
if let detailDescriptionLabel = detailDescriptionLabel,
let compareToButton = compareToButton,
let detailUsedLabel = detailUsedLabel,
let pathologyImageViewOne = pathologyImageViewOne,
let pathologyImageViewTwo = pathologyImageViewTwo,
let detailReferenceLabel = detailReferenceLabel,
let detailPhotoOneCaptionLabel = detailPhotoOneCaptionLabel,
let detailPhotoTwoCaptionLabel = detailPhotoTwoCaptionLabel {
title = detail.name
caseIDOne = detail.caseIDOne
caseIDTwo = detail.caseIDTwo!
detailDescriptionLabel.text = detail.description
compareToButtonString = detail.compareTo!
UIView.performWithoutAnimation {
compareToButton.setTitle("\(compareToButtonString)", for: .normal)
}
detailUsedLabel.text = detail.used
detailReferenceLabel.text = detail.reference
pathologyImageViewOne.image = UIImage(named: detail.photoOne)
pathologyImageViewOne.layer.cornerRadius = 4
pathologyImageViewOne.contentMode = .scaleAspectFill
pathologyImageViewOne.clipsToBounds = true
pathologyImageViewTwo.image = UIImage(named: detail.photoTwo!)
pathologyImageViewTwo.layer.cornerRadius = 4
pathologyImageViewTwo.contentMode = .scaleAspectFill
pathologyImageViewTwo.clipsToBounds = true
// The image in the foreground
let frontImage = UIImage(named: "tap-icon")
// Create the view holding the image
let frontImageViewOne = UIImageView(image: frontImage)
// The size and position of the front image
frontImageViewOne.frame = CGRect(x: 0 , y: 0, width: 34, height: 42)
// turn off AutoresingMask
frontImageViewOne.translatesAutoresizingMaskIntoConstraints = false
// change alpha
frontImageViewOne.alpha = 0.8
// Create the view holding the image again
let frontImageViewTwo = UIImageView(image: frontImage)
// The size and position of the front image again
frontImageViewTwo.frame = CGRect(x: 0 , y: 0, width: 34, height: 42)
// turn off AutoresingMask again
frontImageViewTwo.translatesAutoresizingMaskIntoConstraints = false
// change alpha again
frontImageViewTwo.alpha = 0.8
//MARK: Image One
// Add the front image on top of the background
pathologyImageViewOne.addSubview(frontImageViewOne)
NSLayoutConstraint.activate([
//place the tap icon at the bottom right of parent
frontImageViewOne.bottomAnchor.constraint(equalTo: pathologyImageViewOne.bottomAnchor, constant: -10),
frontImageViewOne.centerXAnchor.constraint(equalTo: pathologyImageViewOne.rightAnchor, constant: -24)
])
let tapGestureRecognizerOne = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizerOne:)))
pathologyImageViewOne.isUserInteractionEnabled = true
pathologyImageViewOne.addGestureRecognizer(tapGestureRecognizerOne)
//MARK: Image two
// Add the front image on top of the background
pathologyImageViewTwo.addSubview(frontImageViewTwo)
NSLayoutConstraint.activate([
//place the tap icon at the bottom right of parent
frontImageViewTwo.bottomAnchor.constraint(equalTo: pathologyImageViewTwo.bottomAnchor, constant: -10),
frontImageViewTwo.centerXAnchor.constraint(equalTo: pathologyImageViewTwo.rightAnchor, constant: -24)
])
let tapGestureRecognizerTwo = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizerTwo:)))
pathologyImageViewTwo.isUserInteractionEnabled = true
pathologyImageViewTwo.addGestureRecognizer(tapGestureRecognizerTwo)
detailPhotoOneCaptionLabel.text = detail.photoOneCaption
detailPhotoTwoCaptionLabel.text = detail.photoTwoCaption
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
configureView()
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.layoutMargins = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
stackView.isLayoutMarginsRelativeArrangement = true
scrollView.addSubview(stackView)
stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
stackView.topAnchor.constraint(equalTo: self.scrollView.topAnchor).isActive = true
stackView.bottomAnchor.constraint(equalTo: self.scrollView.bottomAnchor).isActive = true
}
var detailItem: Descriptor? {
didSet {
// Update the view.
configureView()
}
}
func showWebsite(_ whichCase: Int) {
if let url = URL(string: "https://digitalpathology.uct.ac.za/case_detail.php?case_id=\(whichCase)") {
let config = SFSafariViewController.Configuration()
config.entersReaderIfAvailable = true
let vc = SFSafariViewController(url: url, configuration: config)
present(vc, animated: true)
}
}
@objc func imageTapped(tapGestureRecognizerOne: UITapGestureRecognizer)
{
showWebsite(caseIDOne)
print("Image tapped")
print("CaseOne ID = \(caseIDOne)")
}
@objc func imageTapped(tapGestureRecognizerTwo: UITapGestureRecognizer)
{
showWebsite(caseIDTwo)
print("Image tapped")
print("CaseTwo ID = \(caseIDTwo)")
}
}
我编辑的（为简洁起见）MasterViewController 代码：
import UIKit
class MasterViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchFooter: SearchFooter!
var detailViewController: DetailViewController? = nil
var descriptors = [Descriptor]()
var filteredDescriptors = [Descriptor]()
let searchController = UISearchController(searchResultsController: nil)
fileprivate var collapseDetailViewController = true
// MARK: - view setup
override func viewDidLoad() {
super.viewDidLoad()
// Setup the Search Controller
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search Descriptors"
navigationItem.searchController = searchController
definesPresentationContext = true
//delagate and data source commented out, connected in storyboard
//tableView.delegate = self
//tableView.dataSource = self
// The data
descriptors = [
Descriptor(name:"Friable", description:"Easily crumbled. Said of tissue that readily tears, fragments, or bleeds when gently palpated or manipulated.", photoOne: "Friable", photoOneCaption:"Subacute bacterial edocarditis", used:"Used in relation to – heart valve vegetations, brittle carcinomatous tissue esp. of cervix.", reference: "Ref: DMD", caseIDOne:769),
Descriptor(name:"Hypertrophic / Hypertrophied", description:"An enlarged, overgrown or bulky organ or part, on account of an increase in the size of its cells (compare ‘hyperplastic’).", compareTo: "Hyperplastic", photoOne: "Hypertrophic1", photoOneCaption:"The heart in hypertension", photoTwo: "Hypertrophic2", photoTwoCaption:"The heart in hypertension", used:"Used in relation to – over-exercised muscles or muscular organs such as heart, bladder, stomach.", reference: "Ref: FPMD", caseIDOne:833, caseIDTwo:833),
Descriptor(name:"Hyperplastic", description:"An enlarged or expanded organ or part, on account of an increase in the formation and number of normal cells (compare ‘hypertrophy’). Hyperplastic expansion may be uniform or nodular.", compareTo: "Hypertrophy", photoOne: "Hyperplastic", photoOneCaption:"Hyperplastic gastropathy in Zollinger-Ellison syndrome", used:"Used in relation to - a benign expansion of the prostate, an endo- or epithelium, lymph node, gums or endocrine glands, usually reflecting hyper-stimulation of some cause.", reference: "Ref: MKEDMNAH", caseIDOne:555),]
if let split = splitViewController {
let controllers = split.viewControllers
detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
}
//splitViewController?.delegate = self as? UISplitViewControllerDelegate
splitViewController?.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
if splitViewController!.isCollapsed {
if let selectionIndexPath = self.tableView.indexPathForSelectedRow {
self.tableView.deselectRow(at: selectionIndexPath, animated: animated)
}
}
//lets sort the array of objects so A comes before Z
descriptors.sort { [=11=].name.compare(.name) == .orderedAscending }
self.tableView.reloadData()
super.viewWillAppear(animated)
}
// MARK: - Segues
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let descriptor: Descriptor
if isFiltering() {
descriptor = filteredDescriptors[indexPath.row]
} else {
descriptor = descriptors[indexPath.row]
}
let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
controller.detailItem = descriptor
collapseDetailViewController = false
controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
let backItem = UIBarButtonItem()
backItem.title = "Pathology A-Z"
navigationItem.backBarButtonItem = backItem
}
}
}
// MARK: - Table View
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if isFiltering() {
searchFooter.setIsFilteringToShow(filteredItemCount: filteredDescriptors.count, of: descriptors.count)
return filteredDescriptors.count
}
searchFooter.setNotFiltering()
return descriptors.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let descriptor: Descriptor
if isFiltering() {
descriptor = filteredDescriptors[indexPath.row]
} else {
descriptor = descriptors[indexPath.row]
}
cell.textLabel!.text = descriptor.name
cell.detailTextLabel!.text = descriptor.description
return cell
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return false
}
extension MasterViewController: UISplitViewControllerDelegate {
func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool {
return collapseDetailViewController
}
}
您应该为默认情况准备一个方法。比如说，在 DetailViewController 中声明 detailDefaultItem 并在 configureView() 之前分配给 viewDidLoad 中的 detailItem （只需删除它，因为它已经调用 didSet detailItem):
override func viewDidLoad() {
super.viewDidLoad()
var detailDefaultItem = Descriptor()
// set/configure needed default values in `Descriptor` class or here below
// detailDefaultItem.property = someValue
// ...
detailItem = detailDefaultItem
// configureView()
...
}