请多多包涵。我是编程新手，也是 StackOverflow 的新手。我希望我的问题能给我一个进入编程社区的温暖回应。我信任的一位熟人告诉我在 StackOverflow 上将这封电子邮件发给他。
我该怎么做才能让 NSObject 的两个实例在同一个 ViewController 中工作？我已经初始化了一个名为 SideBar 和 RightSideBar 的 NSObject 子类。它们都来自 NSObject。菜单中的单元格由我以编程方式创建的 TableViewController 创建。我遵循了一个以编程方式完成所有事情的教程，因为我不知道 Storyboard 更适合构建事物。
下面是代码库。
编辑:抱歉啰嗦。我不知道如何让这个更短更完整
============
****注意 SideBar 子类是左侧菜单。 RightSideBar 类具有相同的初始化程序设置并且是右侧菜单。如果可能，我希望能够让它们都出现在同一个 ViewController 的同一个实例中的同一个 ViewController 上。 ****
这是左边的 TableViewController:
import UIKit
//this protocol of the sidebar delegate manages the selection of the item in the row.
protocol SidebarTableViewControllerDelegate {
func sidebarControlDidSelectRow(indexPath: NSIndexPath)
}
class SidebarTableViewController: UITableViewController {
//setting up the delegate and array of menu items.
var delegate:SidebarTableViewControllerDelegate?
var tableData:Array <String> = []
var imageData:[UIImage] = []
// MARK: - Table view data source
//Setting up the number of sections in the menu
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
//Setting up the number of items in the menu
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
//Setting up the menu look for the main screen after login.
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell? = tableView.dequeueReusableCellWithIdentifier("Cell") as? UITableViewCell
if cell == nil {
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
//configure the cell...
cell!.backgroundColor = UIColor.clearColor()
cell!.textLabel?.textColor = UIColor.darkTextColor()
let selectedView:UIView = UIView(frame: CGRect(x: 0, y: 0, width: cell!.frame.size.width, height: cell!.frame.size.height))
selectedView.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.3)
cell!.selectedBackgroundView = selectedView
}
cell!.textLabel!.text = tableData[indexPath.row]
cell!.imageView!.image = imageData[indexPath.row]
return cell!
}
//Setting up the height for each cell of the table
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 45.0
}
//Setting up the selection of the item in the cell.
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
delegate?.sidebarControlDidSelectRow(indexPath)
}
override func viewDidLoad() {
}
override func didReceiveMemoryWarning() {
}
}
这是右表 View Controller :
//setting up the RightSidebarControllerDelegate
protocol RightSidebarTableViewControllerDelegate {
func rightSidebarControlDidSelectRow(indexPath: NSIndexPath)
}
class RightSidebarTableViewController: UITableViewController {
//setting up the delegate and array of menu items.
var delegate:RightSidebarTableViewControllerDelegate?
var rightTableData:Array <String> = []
var rightImageData:[UIImage] = []
// MARK: - Table view data source
//Setting up the number of sections in the menu
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
//Setting up the number of items in the menu
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return rightTableData.count
}
//Setting up the menu look for the main screen after login.
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell? = tableView.dequeueReusableCellWithIdentifier("Cell") as? UITableViewCell
if cell == nil {
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
//configure the cell...
cell!.backgroundColor = UIColor.clearColor()
cell!.textLabel?.textColor = UIColor.darkTextColor()
let selectedView:UIView = UIView(frame: CGRect(x: 0, y: 0, width: cell!.frame.size.width, height: cell!.frame.size.height))
selectedView.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.3)
cell!.selectedBackgroundView = selectedView
}
cell!.textLabel!.text = rightTableData[indexPath.row]
cell!.imageView!.image = rightImageData[indexPath.row]
return cell!
}
//Setting up the height for each cell of the table
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 45.0
}
//Setting up the selection of the item in the cell.
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
delegate?.rightSidebarControlDidSelectRow(indexPath)
}
override func viewDidLoad() {
}
override func didReceiveMemoryWarning() {
}
}
这是我的问题可能从 SideBar:NSObject 开始的地方。这是要初始化的左侧 SideBar:
import UIKit
@objc protocol SideBarDelegate {
func sideBarDidSelectButtonAtIndex (index: Int)
optional func sideBarWillClose()
optional func sideBarWillOpen()
optional func sideBarWillDeinitialize()
}
//this class sets up the actual sidebar.
class SideBar: NSObject, SidebarTableViewControllerDelegate {
//width of the bar, tableview setup, and views for the sidebar
let barWidth:CGFloat = 175.0
let sideBarTableViewTopInset:CGFloat = 25.0
let sideBarContainerView:UIView = UIView()
let sideBarTableViewController:SidebarTableViewController = SidebarTableViewController()
var originView:UIView!
//var for dynamic effect and controlling the sidebar
var animator:UIDynamicAnimator!
var delegate:SideBarDelegate?
var isSideBarOpen:Bool = false
//initializer for the "SideBar" class.
override init() {
super.init()
}
//initializer for the tableView of menu items.
init(sourceView: UIView, menuItems: Array<String>, menuImages: [UIImage]){
super.init()
//initializing the views and animation for the menu.
originView = sourceView
sideBarTableViewController.tableData = menuItems
sideBarTableViewController.imageData = menuImages
setupSideBar()
animator = UIDynamicAnimator(referenceView: originView)
}
//function for setting up the sidebar.
func setupSideBar () {
//setting up the frame/outline of the side bar.
sideBarContainerView.frame = CGRectMake(-barWidth, originView.frame.origin.y + 45, barWidth, originView.frame.size.height)
//setting up the color of the sidebar.
sideBarContainerView.backgroundColor = UIColor.clearColor()
//disables subviews from being confined to the sidebar.
sideBarContainerView.clipsToBounds = false
//placing the sidebar in the UIView
originView.addSubview(sideBarContainerView)
//adding blur to the menu.
let blurView:UIVisualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Light))
blurView.frame = sideBarContainerView.bounds
sideBarContainerView.addSubview(blurView)
//setting up controls for the sidebar
sideBarTableViewController.delegate = self
sideBarTableViewController.tableView.frame = sideBarContainerView.bounds
sideBarTableViewController.tableView.clipsToBounds = false
//disabling the scroll feature. Delete to keep the scroll feature.
sideBarTableViewController.tableView.scrollsToTop = false
//This will remove separators in the UITableCell. Delete to keep separators.
sideBarTableViewController.tableView.separatorStyle = UITableViewCellSeparatorStyle.None
//This sets the background color of the sidebar and creates the inset.
sideBarTableViewController.tableView.backgroundColor = UIColor.clearColor()
sideBarTableViewController.tableView.contentInset = UIEdgeInsets(top: sideBarTableViewTopInset, left: 0, bottom: 0, right: 0)
//reloads the sidebar and adds the container view to the sideBarTableViewController.
sideBarTableViewController.tableView.reloadData()
sideBarContainerView.addSubview(sideBarTableViewController.tableView)
}
func showSideBar(shouldOpen: Bool){
animator.removeAllBehaviors()
isSideBarOpen = shouldOpen
//simple if and else statements to define the direction of animation and intensity of animation
let gravityX:CGFloat = (shouldOpen) ? 0.5 : -0.5
let magnitude:CGFloat = (shouldOpen) ? 20 : -20
let boundaryX:CGFloat = (shouldOpen) ? barWidth : -barWidth
//controls the behavior of the animation.
let gravityBehavior: UIGravityBehavior = UIGravityBehavior(items: [sideBarContainerView])
gravityBehavior.gravityDirection = CGVectorMake(gravityX, 0)
animator.addBehavior(gravityBehavior)
let collisionBehavior: UICollisionBehavior = UICollisionBehavior(items: [sideBarContainerView])
collisionBehavior.addBoundaryWithIdentifier("sideBarBoundary", fromPoint: CGPointMake(boundaryX, 20), toPoint: CGPointMake(boundaryX, originView.frame.size.height))
animator.addBehavior(collisionBehavior)
let pushBehavior:UIPushBehavior = UIPushBehavior(items: [sideBarContainerView], mode: UIPushBehaviorMode.Instantaneous)
pushBehavior.magnitude = magnitude
animator.addBehavior(pushBehavior)
let sideBarBehavior:UIDynamicItemBehavior = UIDynamicItemBehavior(items: [sideBarContainerView])
sideBarBehavior.elasticity = 0.3
animator.addBehavior(sideBarBehavior)
}
func sidebarControlDidSelectRow(indexPath: NSIndexPath) {
delegate?.sideBarDidSelectButtonAtIndex(indexPath.row)
}
}
这是正确的 SideBar:NSObject，最终将初始化正确的菜单。
import UIKit
@objc protocol RightSideBarDelegate {
func rightSideBarDidSelectButtonAtIndex (index: Int)
optional func sideBarWillClose()
optional func sideBarWillOpen()
}
class RightSideBar: NSObject, RightSidebarTableViewControllerDelegate {
//width of the bar, tableview setup, and views for the sidebar
let barWidth:CGFloat = 175.0
let rightSideBarTableViewTopInset:CGFloat = 25.0
let rightSideBarContainerView:UIView = UIView()
let rightSideBarTableViewController:RightSidebarTableViewController = RightSidebarTableViewController()
var rightOriginView:UIView!
//var for dynamic effect and controlling the sidebar
var animator:UIDynamicAnimator!
var delegate:RightSideBarDelegate?
var isSideBarOpen:Bool = false
//initializer for the "SideBar" class.
override init() {
super.init()
}
//initializer for the tableView of menu items.
init(rightSourceView: UIView, rightMenuItems: Array<String>, rightMenuImages: [UIImage]){
super.init()
//initializing the views and animation for the menu.
rightOriginView = rightSourceView
rightSideBarTableViewController.rightTableData = rightMenuItems
rightSideBarTableViewController.rightImageData = rightMenuImages
setupSideBar()
animator = UIDynamicAnimator(referenceView: rightOriginView)
}
//function for setting up the sidebar.
func setupSideBar () {
//setting up the frame/outline of the side bar.
rightSideBarContainerView.frame = CGRectMake(rightOriginView.frame.size.width + barWidth , rightOriginView.frame.origin.y + 45, barWidth, rightOriginView.frame.size.height)
//setting up the color of the sidebar.
rightSideBarContainerView.backgroundColor = UIColor.clearColor()
//disables subviews from being confined to the sidebar.
rightSideBarContainerView.clipsToBounds = false
//placing the sidebar in the UIView
rightOriginView.addSubview(rightSideBarContainerView)
//adding blur to the menu.
let blurView:UIVisualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Light))
blurView.frame = rightSideBarContainerView.bounds
rightSideBarContainerView.addSubview(blurView)
//setting up controls for the sidebar
rightSideBarTableViewController.delegate = self
rightSideBarTableViewController.tableView.frame = rightSideBarContainerView.bounds
rightSideBarTableViewController.tableView.clipsToBounds = false
//disabling the scroll feature. Delete to keep the scroll feature.
rightSideBarTableViewController.tableView.scrollsToTop = false
//This will remove separators in the UITableCell. Delete to keep separators.
rightSideBarTableViewController.tableView.separatorStyle = UITableViewCellSeparatorStyle.None
//This sets the background color of the sidebar and creates the inset.
rightSideBarTableViewController.tableView.backgroundColor = UIColor.clearColor()
rightSideBarTableViewController.tableView.contentInset = UIEdgeInsets(top: rightSideBarTableViewTopInset, left: 0, bottom: 0, right: 0)
//reloads the sidebar and adds the container view to the rightSideBarTableViewController.
rightSideBarTableViewController.tableView.reloadData()
rightSideBarContainerView.addSubview(rightSideBarTableViewController.tableView)
}
func showSideBar(shouldOpen: Bool){
animator.removeAllBehaviors()
isSideBarOpen = shouldOpen
//simple if and else statements to define the direction of animation and intensity of animation
let gravityX:CGFloat = (shouldOpen) ? -0.5 : 0.5
let magnitude:CGFloat = (shouldOpen) ? -20 : 20
let boundaryX:CGFloat = (shouldOpen) ? -barWidth : barWidth
//controls the behavior of the animation.
let gravityBehavior: UIGravityBehavior = UIGravityBehavior(items: [rightSideBarContainerView])
gravityBehavior.gravityDirection = CGVectorMake(gravityX, 0)
animator.addBehavior(gravityBehavior)
let collisionBehavior: UICollisionBehavior = UICollisionBehavior(items: [rightSideBarContainerView])
collisionBehavior.addBoundaryWithIdentifier("sideBarBoundary", fromPoint: CGPointMake(boundaryX, 20), toPoint: CGPointMake(boundaryX, rightOriginView.frame.size.height))
animator.addBehavior(collisionBehavior)
let pushBehavior:UIPushBehavior = UIPushBehavior(items: [rightSideBarContainerView], mode: UIPushBehaviorMode.Instantaneous)
pushBehavior.magnitude = magnitude
animator.addBehavior(pushBehavior)
let sideBarBehavior:UIDynamicItemBehavior = UIDynamicItemBehavior(items: [rightSideBarContainerView])
sideBarBehavior.elasticity = 0.3
animator.addBehavior(sideBarBehavior)
}
func rightSidebarControlDidSelectRow(indexPath: NSIndexPath) {
delegate?.rightSideBarDidSelectButtonAtIndex(indexPath.row)
}
}
最后，这是我当前的 DoubleMenuViewController 代码。当我继续使用 DoubleMenuViewController 来打破菜单时会发生一些事情。菜单甚至不会加载。但是，如果我在一个只调用 SideBar:NSObject 的 SingleMenuViewController 中，那么只要我只调用一个菜单，代码就可以工作。在这个 DoubleMenuViewController 中，我将 RightSideBar 类的初始化部分注释掉了，因为我正在研究解决方案。我知道这个 ViewController 的代码是乱码。我正在尝试我能想到的一切。在代码之后查看我的评论以了解我尝试过的内容:
import UIKit
class DoubleMenuViewController: UIViewController, SideBarDelegate, RightSideBarDelegate {
var sideBar:SideBar?
var ondemandSideBar:SideBar {
get {
if sideBar == nil {
//setting up the menu items for the sidebar.
sideBar = SideBar(sourceView: self.view, menuItems: ["Home", "Share", "About", "Help"], menuImages: [homeImage!, shareImage!, aboutImage!, helpImage!])
sideBar!.delegate = self
SideBar.new()
}
return sideBar!
}
}
//initializes the "RightSideBar"
var rightSideBar:RightSideBar?
var ondemandRightSideBar:RightSideBar {
get {
if rightSideBar == nil {
rightSideBar = RightSideBar(rightSourceView: self.view, rightMenuItems: [//Other items], rightMenuImages: [//Other Items])
rightSideBar!.delegate = self
RightSideBar.new()
}
return rightSideBar!
}
}
var homeImage = UIImage(named: "Home")
var shareImage = UIImage(named: "Share")
var aboutImage = UIImage(named: "About")
var helpImage = UIImage(named: "Help")
@IBOutlet weak var currentMenuControl: UIBarButtonItem!
@IBAction func currentMenuDisplay(sender: AnyObject) {
if currentMenuControl.tag == 1 {
ondemandSideBar.showSideBar(true)
currentMenuControl.tag = 0
} else {
ondemandSideBar.showSideBar(false)
currentMenuControl.tag = 1
}
}
@IBOutlet weak var progressionMenuControl: UIBarButtonItem!
@IBAction func progressionMenuDisplay(sender: AnyObject) {
if progressionMenuControl.tag == 1 {
ondemandRightSideBar.showSideBar(true)
progressionMenuControl.tag = 0
} else {
ondemandRightSideBar.showSideBar(false)
progressionMenuControl.tag = 1
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func sideBarDidSelectButtonAtIndex(index: Int) {
switch index {
//segues
}
}
func rightSideBarDidSelectButtonAtIndex(index: Int) {
switch index {
//segues
}
}
}
这是我尝试过的:
从左边来。
一切克服实例变量中的运行时混淆和
类名。这包括重命名您在
NSObject 子类和目标 View Controller 。
按钮标签。我取消了滑动功能以显示菜单和
添加按钮是因为我认为系统难以处理
刷卡。
让我陷入困境的只是一个导致应用程序崩溃的无限循环
登录后。
targetViewController.....DoubleMenuViewController 和
单菜单 View Controller 。我回到了带有按钮的工作菜单
在 SingleMenuViewController 中，但它仍然不会显示左侧和
DoubleMenuViewController 中的右侧菜单。
似乎我的菜单是从 SideBar: NSObject 文件和 RightSideBar:NSObject 文件初始化的。我的意思是我的菜单是在我点击目标 View Controller 之前创建的。只要我能让编译器在同一个 View Controller 中初始化 SideBar 和 RightSideBar，这对我来说就不是问题，但它不会这样做。
我只需要能够通过滑动或点击按钮来控制两个菜单。
我想我的初始化程序相互覆盖有问题。
但是，我不知道如何解决这个问题。我已经通读了 Swift 手册并阅读了互联网上的文章。我也搜索过 StackOverflow。
最佳答案
你问:
How do I Initialize two instances of
NSObjectin the same view controller?
撇开你为什么要处理
NSObject根本上(在 Objective-C 中，所有类都必须从 NSObject 子类化，最终在 Swift 中不再如此)，如果你想实例化两个对象，你只需要为每个对象拥有一个属性。如果这些被延迟实例化，正如您的代码片段所暗示的那样，那么您必须确定引用该延迟实例化的属性的位置(例如，您可能会从“从边缘滑动”手势中触发它)或您有什么。在引用延迟实例化属性的代码中设置一个断点，并确保您完全到达那里。
——
我对您的代码片段之一进行了一些观察。你说你正在像这样实例化你的侧边栏:
var sideBar : SideBar?
var ondemandSideBar : SideBar {
get {
if sideBar == nil {
sideBar = SideBar(sourceView, menuItems, menuImage etc.)
sideBar!.delegate
SideBar.new()
}
}
}
我认为这不是你真正在做的，因为你没有设置委托(delegate)，你们都在实例化
SideBar以及调用 new (您不应该在 Swift 中这样做)，您没有返回值等。此外，具有由某些计算属性实例化的存储属性的模式具有特定的 Objective-C je ne sais quoi。我推断您想要一个延迟实例化的属性。如果是这样，我倾向于使用单个
lazy存储的属性(property)。然后我会使用闭包懒惰地设置该属性:我期待这样的模式
protocol SideBarDelegate : class { // specify class so we can use `weak` reference
func didChooseMenuItem(sender: SideBar, item: Int)
}
class SideBar {
weak var delegate: SideBarDelegate? // make sure this is weak to avoid strong reference cycle
}
class ViewController: UIViewController, SideBarDelegate {
lazy var sideBar: SideBar = {
let _sideBar = SideBar(sourceView, menuItems, menuImage, etc.)
_sideBar.delegate = self
return _sideBar
}()
func didChooseMenuItem(sender: SideBar, item: Int) {
// handle it here
}
// etc.
}
这样，
sideBar在您引用 sideBar 之前不会被实例化在您的代码中的某个地方，但是当您这样做时，它将使用该闭包内的代码进行实例化。
关于ios - 如何在同一个 ViewController 中初始化 NSObject 的两个实例 - Swift，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31728420/