NSCoder：无法识别的select器发送到实例
所以，我是iOS新手，一直在使用在线教程来学习这个平台。 我正在使用的教程是在使用iOS 10时使用iOS 9构build应用程序。因此，我遇到了标题问题。 这里是一些代码：
CalendarEvent.swift
class CalendarEvent : NSObject { var title : String var dateString : String init(withTitle t : String, andDateString ds : String) { title = t dateString = ds } init(withCoder coder : NSCoder) { dateString = coder.decodeObject(forKey: "dateString") as! String title = coder.decodeObject(forKey: "title") as! String } func encodeWithCoder(coder : NSCoder) { coder.encode(dateString, forKey: "dateString") coder.encode(title, forKey: "title") } } 以下片段来自错误体现的另一个类：
SingleDayTableViewController.swift
@IBAction func addButtonPressed(sender : UIBarButtonItem) { let newEvent = "Test Event \(events.count + 1)" let defaultsKey = "\(monthNumber) - \(dayNumber)" let ce = CalendarEvent(withTitle: newEvent, andDateString: defaultsKey) let encodedCE = NSKeyedArchiver.archivedData(withRootObject: ce) // This line breaks the program. events.append(encodedCE as AnyObject) UserDefaults.standard.set(events, forKey: defaultsKey) UserDefaults.standard.synchronize() tableView.reloadData() }
我不知道为什么会发生这种情况，但希望这里有人能为我解决问题。 我将在下面包含堆栈跟踪。
2017-02-08 13:57:49.026 myCalendar[80042:1651988] -[myCalendar.CalendarEvent encodeWithCoder:]: unrecognized selector sent to instance 0x600000073440 2017-02-08 13:57:49.059 myCalendar[80042:1651988] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[myCalendar.CalendarEvent encodeWithCoder:]: unrecognized selector sent to instance 0x600000073440' *** First throw call stack: ( 0 CoreFoundation 0x00000001104b6d4b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010ff1821e objc_exception_throw + 48 2 CoreFoundation 0x0000000110526f04 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132 3 CoreFoundation 0x000000011043c005 ___forwarding___ + 1013 4 CoreFoundation 0x000000011043bb88 _CF_forwarding_prep_0 + 120 5 Foundation 0x000000010fa4fcac _encodeObject + 1263 6 Foundation 0x000000010fa84a22 +[NSKeyedArchiver archivedDataWithRootObject:] + 156 7 myCalendar 0x000000010f923504 _TFC10myCalendar28SingleDayTableViewController16addButtonPressedfT6senderCSo15UIBarButtonItem_T_ + 980 8 myCalendar 0x000000010f9239aa _TToFC10myCalendar28SingleDayTableViewController16addButtonPressedfT6senderCSo15UIBarButtonItem_T_ + 58 9 UIKit 0x00000001108dc8bc -[UIApplication sendAction:to:from:forEvent:] + 83 10 UIKit 0x0000000110d1e4a1 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 149 11 UIKit 0x00000001108dc8bc -[UIApplication sendAction:to:from:forEvent:] + 83 12 UIKit 0x0000000110a62c38 -[UIControl sendAction:to:forEvent:] + 67 13 UIKit 0x0000000110a62f51 -[UIControl _sendActionsForEvents:withEvent:] + 444 14 UIKit 0x0000000110a630db -[UIControl _sendActionsForEvents:withEvent:] + 838 15 UIKit 0x0000000110a61e4d -[UIControl touchesEnded:withEvent:] + 668 16 UIKit 0x000000011094a545 -[UIWindow _sendTouchesForEvent:] + 2747 17 UIKit 0x000000011094bc33 -[UIWindow sendEvent:] + 4011 18 UIKit 0x00000001108f89ab -[UIApplication sendEvent:] + 371 19 UIKit 0x00000001219f2481 -[UIApplicationAccessibility sendEvent:] + 93 20 UIKit 0x00000001110e572d __dispatchPreprocessedEventFromEventQueue + 3248 21 UIKit 0x00000001110de463 __handleEventQueue + 4879 22 CoreFoundation 0x000000011045b761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 23 CoreFoundation 0x000000011044098c __CFRunLoopDoSources0 + 556 24 CoreFoundation 0x000000011043fe76 __CFRunLoopRun + 918 25 CoreFoundation 0x000000011043f884 CFRunLoopRunSpecific + 420 26 GraphicsServices 0x0000000114b45a6f GSEventRunModal + 161 27 UIKit 0x00000001108dac68 UIApplicationMain + 159 28 myCalendar 0x000000010f924caf main + 111 29 libdyld.dylib 0x0000000113bb568d start + 1 30 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException
在几个用户的帮助下和一些增加的search，我能够找出我的问题的原因。
根据前面提到的用户的build议，我将NSCoding协议添加到了我的CalendarEvent类中。
class CalendarEvent : NSObject, NSCoding { .... }
不幸的是，这并没有完全解决这个问题，但这是一个开始。 一些错误和一个快速search显示我必须改变这一点：
init(withCoder coder : NSCoder){ .... } func encodeWithCoder(coder : NSCoder){ .... }
对此：
required init(coder : NSCoder) { .... } func encode(with aCoder : NSCoder) { .... }
进行这些更改后，我的代码运行得非常好。