在我的学校项目中出现此错误，我不知道在哪里看： （介绍：在这个单元中，我们将构建一个ToDo List App。我们将在Swift中探索Master-Detail视图以及更复杂的代码。
成功完成本单位将使您：
扩展本机Swift类以添加您自己的功能 存储与应用程序关联的数据 使用SplitViewController创建Master-Detail应用程序 响应用户请求 具有故事板序列的视图控制器之间的转换 显示对话框以响应用户交互 读数
完成第4章并完成本单元中的内容后，您应该已准备好完成作业。 ）
2017-07-06 11:28:59.938 ToDoList[1154:162653] -[ToDoList.ToDoItem encodeWithCoder:]: unrecognized selector sent to instance 0x60000027da40
2017-07-06 11:28:59.951 ToDoList[1154:162653] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ToDoList.ToDoItem encodeWithCoder:]: unrecognized selector sent to instance 0x60000027da40'
*** First throw call stack:
(
0 CoreFoundation 0x0000000109336b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000108d9b141 objc_exception_throw + 48
2 CoreFoundation 0x00000001093a6134 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00000001092bd840 ___forwarding___ + 1024
4 CoreFoundation 0x00000001092bd3b8 _CF_forwarding_prep_0 + 120
5 Foundation 0x00000001088d9b16 _encodeObject + 1224
6 Foundation 0x00000001088daeb0 -[NSKeyedArchiver _encodeArrayOfObjects:forKey:] + 439
7 Foundation 0x00000001088d9b16 _encodeObject + 1224
8 Foundation 0x000000010890d3fe +[NSKeyedArchiver archivedDataWithRootObject:] + 156
9 ToDoList 0x00000001087aebcc _TZFC8ToDoList15ToDoListManagerP33_CE0D50EB39E1FB8DDE4ED96B00EE34055storefT5itemsGSaCS_8ToDoItem__T_ + 140
10 ToDoList 0x00000001087ae9ef _TFC8ToDoList15ToDoListManager7addItemfT4itemCS_8ToDoItem_T_ + 207
11 ToDoList 0x00000001087b0ad7 _TFFC8ToDoList20MasterViewController16addButtonPressedFT6senderPs9AnyObject__T_U0_FCSo13UIAlertActionT_ + 695
12 ToDoList 0x00000001087b07dc _TTRXFo_oCSo13UIAlertAction__XFdCb_dS___ + 60
13 UIKit 0x0000000109ac2f45 -[UIAlertController _invokeHandlersForAction:] + 105
14 UIKit 0x0000000109ac38b0 __85-[UIAlertController _dismissAnimated:triggeringAction:triggeredByPopoverDimmingView:]_block_invoke.454 + 16
15 UIKit 0x00000001098d6177 -[UIPresentationController transitionDidFinish:] + 1351
16 UIKit 0x00000001098d9af6 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_2 + 183
17 UIKit 0x000000010a289d1c -[_UIViewControllerTransitionContext completeTransition:] + 102
18 UIKit 0x0000000109813024 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 527
19 UIKit 0x00000001097e6257 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 222
20 UIKit 0x00000001097e6796 -[UIViewAnimationState animationDidStop:finished:] + 136
21 QuartzCore 0x000000010e7d068e _ZN2CA5Layer23run_animation_callbacksEPv + 306
22 libdispatch.dylib 0x000000010c95f05c _dispatch_client_callout + 8
23 libdispatch.dylib 0x000000010c94040b _dispatch_main_queue_callback_4CF + 411
24 CoreFoundation 0x00000001092fb909 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
25 CoreFoundation 0x00000001092c1ae4 __CFRunLoopRun + 2164
26 CoreFoundation 0x00000001092c1016 CFRunLoopRunSpecific + 406
27 GraphicsServices 0x000000010d916a24 GSEventRunModal + 62
28 UIKit 0x000000010975a134 UIApplicationMain + 159
29 ToDoList 0x00000001087ac257 main + 55
30 libdyld.dylib 0x000000010c9ab65d start + 1
31 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
代码是：
import Foundation
class ToDoItem: NSCoder {
let itemDescription: String
let completed: Bool
let dataAdded: NSDate
init(description: String) {
self.itemDescription = description
self.completed = false
self.dataAdded = NSDate()
}
func getDateAdded() -> String {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
return formatter.string(from:self.dataAdded as Date)
}
//Mark: - NSCoding -
required init(coder aDecoder: NSCoder) {
self.itemDescription = aDecoder.decodeObject(forKey: "description") as! String
self.completed = aDecoder.decodeObject(forKey: "completed") as! Bool
self.dataAdded = aDecoder.decodeObject(forKey: "dateAdded") as! NSDate
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encode(self.itemDescription, forKey: "description")
aCoder.encode(self.completed, forKey: "completed")
aCoder.encode(self.dataAdded, forKey: "dateAdded")
}
}
并且由此调用：
import Foundation
class ToDoListManager {
private static let userDefaults = UserDefaults.standard
private static let listKey = "ToDoListKey"
var toDoItems: [ToDoItem]
init() {
toDoItems = [ToDoItem]()
//self.toDoItems.append(ToDoItem(description: "Get Milk"))
//self.toDoItems.append(ToDoItem(description: "Walk Dog"))
//self.toDoItems.append(ToDoItem(description: "Pay Bills"))
//self.userDefaults.set("test", forKey: listKey)
self.toDoItems = ToDoListManager.retrieve() ?? [ToDoItem]()
}
func getItems() -> [ToDoItem]{
return self.toDoItems
}
func numberItems() -> Int {
return self.toDoItems.count
}
func addItem(item: ToDoItem) {
self.toDoItems.append(item)
ToDoListManager.store(items: self.toDoItems)
}
func removeItem(index: Int) {
self.toDoItems.remove(at: index)
}
func getFirstItem() -> ToDoItem? {
return self.toDoItems.first
}
private class func store(items: [ToDoItem]) {
let encodedObject = NSKeyedArchiver.archivedData(withRootObject: items)
userDefaults.set(encodedObject, forKey: listKey)
userDefaults.synchronize()
}
private class func retrieve() -> [ToDoItem]? {
if let decodedObject = userDefaults.object(forKey: listKey) as? NSData {
return NSKeyedUnarchiver.unarchiveObject(with: decodedObject as Data) as? [ToDoItem]
}
return nil
}
}