【发布时间】：2015-08-12 23:31:36
【问题描述】：
我问这个问题是因为我在这个问题中收到的答案是：How Do I Initialize Two Instances of NSObject in the same ViewController - Swift
把我带到了这个方向。无论我是 NSObject 还是 UIViewController 的子类，当我将代码更改为以下内容时，我仍然会收到无法识别的选择器。
我仍在尝试能够创建左右侧边栏。但是，我现在什至无法加载一个 SideBar。我收到一个错误 [UIViewController Center]: unrecognized selector sent to instance xxxxx。
这个问题与我见过的其他无法识别的选择器实例问题不同，因为我没有处理按钮并且没有出口，因为一切都是以编程方式完成的。因此，我无法在情节提要中指定链接到 UIViewController 的子类。
我觉得一旦我解决了选择器问题，代码就会起作用。由于现在的代码，应用程序编译得很好。问题是我收到的运行时错误。如有必要，我可以提供来自调试器的信息。
Fwiw，运行时似乎从错误消息中识别出我有一个中心、左和右视图控制器。
我没有包含 RightSideBar 代码，因为我认为如果 left SideBar 运行，RightSideBar 将在我添加解决方案时运行。我想让你必须阅读的代码尽可能简短。
最后要注意的是，我正在处理我的所有打印声明。我实际上打印到它说“我应该显示侧边栏”。
这是 SideBar 的代码：
//optional delegate methods that select when the sidebar opens and closes.
@objc protocol SideBarDelegate : class {
func sideBarDidSelectButtonAtIndex (itemIndex: Int)
optional func sideBarWillClose()
optional func sideBarWillOpen()
}
//this class sets up the actual sidebar.
class SideBar: UIViewController, SidebarTableViewControllerDelegate {
//width of the bar, tableview setup, and views for the sidebar
let barWidth:CGFloat = 175.0
let sideBarTableViewTopInset:CGFloat = 25.0
let sideBarContainerView:UIViewController = UIViewController()
let sideBarTableViewController:SidebarTableViewController = SidebarTableViewController()
var originView:UIViewController?
//var for dynamic effect and controlling the sidebar
var animator:UIDynamicAnimator!
weak var delegate:SideBarDelegate?
var isSideBarOpen:Bool = false
//initializer for the "SideBar" class.
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override init(nibName NibNameOrNil:String!, bundle nibBundleOrNil:NSBundle!) {
super.init(nibName: nil, bundle: nil)
}
convenience init(){
self.init(nibName: nil, bundle: nil)
}
//initializer for the tableView of menu items.
init(sourceView: UIViewController, menuItems: Array<String>, menuImages: [UIImage]){
self.originView = sourceView
self.sideBarTableViewController.tableData = menuItems
self.sideBarTableViewController.imageData = menuImages
println("set initialization values")
super.init(nibName: nil, bundle: nil)
//initializing the views and animation for the menu.
setupSideBar()
animator = UIDynamicAnimator(referenceView: originView!.view)
println("finished initialization")
//swipe gesture recognition for opening the menu.
let showGestureRecognizer:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: "handleSwipe:")
showGestureRecognizer.direction = UISwipeGestureRecognizerDirection.Right
originView!.view.addGestureRecognizer(showGestureRecognizer)
let hideGestureRecognizer:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: "handleSwipe:")
hideGestureRecognizer.direction = UISwipeGestureRecognizerDirection.Left
originView!.view.addGestureRecognizer(hideGestureRecognizer)
}
override func viewDidLoad() {
println("view loaded")
}
//this function handles the direction of swipes
func handleSwipe(recognizer: UISwipeGestureRecognizer){
if recognizer.direction == UISwipeGestureRecognizerDirection.Left {
showSideBar(false)
delegate?.sideBarWillClose?()
println("closed the sideBar")
} else {
println("opened the sideBar")
showSideBar(true)
delegate?.sideBarWillOpen?()
}
}
//function for setting up the sidebar.
func setupSideBar () {
println("setup sideBar")
//setting up the frame/outline of the side bar.
sideBarContainerView.view.frame = CGRectMake(-barWidth - 1, originView!.view.frame.origin.y, barWidth, originView!.view.frame.size.height)
//setting up the color of the sidebar.
sideBarContainerView.view.backgroundColor = UIColor.clearColor()
//disables subviews from being confined to the sidebar.
sideBarContainerView.view.clipsToBounds = false
//placing the sidebar in the UIView
originView!.view.addSubview(sideBarContainerView.view)
//adding blur to the menu.
let blurView:UIVisualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Light))
blurView.frame = sideBarContainerView.view.bounds
sideBarContainerView.view.addSubview(blurView)
//setting up controls for the sidebar
sideBarTableViewController.delegate = self
sideBarTableViewController.tableView.frame = sideBarContainerView.view.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.view.addSubview(sideBarTableViewController.tableView)
originView?.addChildViewController(sideBarContainerView)
sideBarContainerView.didMoveToParentViewController(originView)
}
func showSideBar(shouldOpen: Bool){
animator.removeAllBehaviors()
isSideBarOpen = shouldOpen
println("I should be showing the sideBar")
//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 - 1
//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!.view.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)
}
}
这里是 Home ViewController：
class Home: UIViewController, SideBarDelegate {
//*** Must put logout code into the logout button it should log the user out if they press it ***
var sideBar:SideBar = SideBar()
var homeImage = UIImage(named: "Shine Home")
var profileImage = UIImage(named: "Shine Profile")
var shareImage = UIImage(named: "Shine Share")
var aboutImage = UIImage(named: "Shine About")
var helpImage = UIImage(named: "Shine Help")
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//setting up the menu items for the sidebar.
sideBar = SideBar(sourceView: self, menuItems: ["Home", "Profile", "Share", "About", "Help"], menuImages: [homeImage!, profileImage!, shareImage!, aboutImage!, helpImage!])
sideBar.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func sideBarDidSelectButtonAtIndex(itemIndex: Int) {
switch itemIndex {
case 0:
let vc = storyboard?.instantiateViewControllerWithIdentifier("Home") as! Home
self.navigationController?.pushViewController(vc, animated: true)
case 1:
performSegueWithIdentifier("profile", sender: self)
case 2:
performSegueWithIdentifier("share", sender: self)
case 3:
performSegueWithIdentifier("about", sender: self)
case 4:
performSegueWithIdentifier("help", sender: self)
default:
break
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
【问题讨论】：
-
尝试
let sideBarContainerView:UIViewController = UIViewController() as! SideBar会产生运行时错误：无法将 UIViewController 类型的值转换为 SideBar。这是我能想到的向代码添加某种信号的唯一方法，即 SideBar 是唯一的。
标签： ios swift uiviewcontroller menu sidebar