[英]Swift 4 Split View Controller Detail Replaces Master
I just started building an app and right now I am adding 2 Split View Controllers, in my Main.storyboard it looks like this image 我刚刚开始构建一个应用程序,现在我在我的Main.storyboard中添加了2个Split View控制器,它看起来像这个图像
I added the following code to my Master: 我将以下代码添加到我的主人:
import UIKit
class ContactsMaster: UITableViewController {
var ContactsDetailController: ContactsDetail? = nil
var objects = [Any]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
navigationItem.leftBarButtonItem = editButtonItem
let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(insertNewObject(_:)))
navigationItem.rightBarButtonItem = addButton
if let split = splitViewController {
let controllers = split.viewControllers
ContactsDetailController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? ContactsDetail
}
}
override func viewWillAppear(_ animated: Bool) {
clearsSelectionOnViewWillAppear = splitViewController!.isCollapsed
super.viewWillAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@objc
func insertNewObject(_ sender: Any) {
objects.insert(NSDate(), at: 0)
let indexPath = IndexPath(row: 0, section: 0)
tableView.insertRows(at: [indexPath], with: .automatic)
}
// MARK: - Segues
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showContactDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let object = objects[indexPath.row] as! NSDate
let controller = (segue.destination as! UINavigationController).topViewController as! ContactsDetail
controller.detailItem = object
controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
}
}
}
// MARK: - Table View
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return objects.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let object = objects[indexPath.row] as! NSDate
cell.textLabel!.text = object.description
return cell
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
objects.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
}
And here is my Detail: 这是我的细节:
import UIKit
class ContactsDetail: UIViewController {
@IBOutlet weak var detailDescriptionLabel: UILabel!
func configureView() {
// Update the user interface for the detail item.
if let detail = detailItem {
if let label = detailDescriptionLabel {
label.text = detail.description
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
configureView()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var detailItem: NSDate? {
didSet {
// Update the view.
configureView()
}
}
}
My problem is when I run my app and goto the Split View Controller and select an item in the Master, it does not goto the Detail, but instead replaces the master. 我的问题是,当我运行我的应用程序并转到拆分视图控制器并在主控中选择一个项目时,它不会转到详细信息,而是替换主控。
I have a sample app that is just the Split View Controller and I noticed in the App Delegate file of the sample app there is this code in the application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool method: 我有一个示例应用程序只是拆分视图控制器,我注意到在示例应用程序的App Delegate文件中,应用程序中有此代码(_ application:UIApplication,didFinishLaunchingWithOptions launchOptions:[UIApplicationLaunchOptionsKey:Any]?) - > Bool方法:
let splitViewController = window!.rootViewController as! UISplitViewController
let navigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController
navigationController.topViewController!.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
splitViewController.delegate = self
And there is also this method: 还有这种方法:
func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController:UIViewController, onto primaryViewController:UIViewController) -> Bool {
guard let secondaryAsNavController = secondaryViewController as? UINavigationController else { return false }
guard let topAsDetailController = secondaryAsNavController.topViewController as? DetailViewController else { return false }
if topAsDetailController.detailItem == nil {
// Return true to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded.
return true
}
return false
}
My problem with this code is that my Split View Controller is not the inital controller and my problem with the splitViewController method, I have 2 split view controllers, I can only specificity 1 of them. 我的这个代码的问题是我的分割视图控制器不是初始控制器和我的splitViewController方法的问题,我有2个分割视图控制器,我只能特异性1。 How do I get this split view controller without making it the inital controller?
如何在不将其作为初始控制器的情况下获得此分割视图控制器?
your master class must implement UISplitViewControllerDelegate. 您的主类必须实现UISplitViewControllerDelegate。 so first thing you need to do :
所以你需要做的第一件事:
class ContactsMaster: UITableViewController,UISplitViewControllerDelegate {
and override this function in your master: 并在您的主人中覆盖此功能:
func splitViewController(splitViewController: UISplitViewController, collapseSecondaryViewController secondaryViewController: UIViewController, ontoPrimaryViewController primaryViewController: UIViewController) -> Bool {
return true
}
then in viewDidLoad(master class) add following cods: 然后在viewDidLoad(master类)中添加以下代码:
self.splitViewController!.delegate = self;
self.splitViewController!.preferredDisplayMode = UISplitViewControllerDisplayMode.AllVisible
self.extendedLayoutIncludesOpaqueBars = true
I think you skip many steps for configuring splitviewcontroller, if you want to understand all the way you can read one of many tutorials written for it, like: 我想你跳过很多步骤来配置splitviewcontroller,如果你想要了解所有的方法,你可以阅读为它编写的许多教程之一,例如:
http://nshipster.com/uisplitviewcontroller/ http://nshipster.com/uisplitviewcontroller/
您是否偶然忘记在故事板中为Detail VC设置ContactsDetail类?
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