UIBarButtonItem函数

Question

我正在使用Core数据，并使用以下代码创建了一个保存按钮：

    self.navigationItem.setRightBarButtonItem(UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: Selector("saveTapped")), animated: true)

保存功能：

  func saveTapped(){
            if (cell!.textField.text.isEmpty) {
                let alert = UIAlertView()
                alert.title = "Nevyplnené údaje"
                alert.message = "Musíš vyplniť všetky údaje o knihe."
                alert.addButtonWithTitle("Ok")
                alert.show()


            }
            let appDel: AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
            let obsah: NSManagedObjectContext = appDel.managedObjectContext!
            let entity = NSEntityDescription.entityForName("List", inManagedObjectContext: obsah)
            var pridat = Model(entity: entity! , insertIntoManagedObjectContext: obsah)

            pridat.kniha = cell!.textField.text
            pridat.autor = cell!.textField.text
            pridat.rok = cell!.textField.text
            pridat.vydavatelstvo = cell!.textField.text
            pridat.strany = cell!.textField.text

            obsah.save(nil)
        }

这是我正在犯的错误：

2015-04-29 19:12:42.762 iKnižnica25716:11689183 -iKniz_nica.PridatViewController saveTapped:未被识别的选择器发送到实例0x7ff5ab63ff50 2015-04-29 19:42.851 iKnižnica25716:11689183 *终止应用程序由于未登录异常'NSInvalidArgumentException'，原因：'-iKniz_nica.PridatViewController saveTapped:发送给实例0x7ff5ab63ff50‘*第一次抛出调用堆栈：(0 CoreFoundation 0x0000100bccc65 exceptionPreprocess + 165 1 libobjc.A.dylib ) 0x0000000102737bb7 objc_exception_throw + 45 2 CoreFoundation 0x0000000100bd40ad -NSObject(NSObject) doesNotRecognizeSelector：+ 205 3 CoreFoundation 0x0000000100b2a13c ___forwarding_ + 988 4 CoreFoundation 0x0000000100b29c8 _CF_forwarding_prep_0 + 120 5 UIKit 0x000000010146cda2 -UIApplication sendAction:to:from:forEvent：+756 UIKit 0x00000010146cda2 -UIApplication sendAction:to:forEvent：+ 75 7 UIKit 0x000000010157e54a -UIControl _sendActionsForEvents:withEvent：+ 467 8 UIKit 0x000000010157d919 -UIControl接触点:withEvent：+ 522 9 UIKit-UIWindow _sendTouchesForEvent：+ 735 10 UIKit 0x00000001014ba2c2 -UIWindow sendEvent：+ 682 11 UIKit -UIApplication sendEvent：+ 246 12 UIKit 0x000000010148dd1c _UIApplicationHandleEventFromQueueEvent + 18265 13 UIKit 0x00000001014685dc _UIApplicationHandleEventQueue + 2066 14 CoreFoundation 0x0000000100b00431 _UIApplicationHandleEventQueue+ 17 15 CoreFoundation 0x0000000100af62fd __CFRunLoopDoSources0 + 269 16 CoreFoundation 0x0000000100af5934 __CFRunLoopRun + 868 17 CoreFoundation 0x0000000100af5366 CFRunLoopRunSpecific + 470 18 GraphicsServices 0x0000000104bb3a3e GSEventRunModal + 161 19 UIKit 0x000000010146b900 UIApplicationMain + 1282 20 iKniz 0x00000001005c6377 main + 135 21 libdyld.dylib 0x0000000102e8f145Start+1) libc++abi.dylib:以NSException (lldb)类型的完全例外终止

我在这里发布了源代码：http://pastebin.com/M9AMakGr

Answer 1

问题不在于按钮设置，而在于功能。

而不是：

func saveTapped(){

应：

func saveTapped(sender:UIButton){

Answer 2

将setRightBarButtonItem代码更改为以下代码：

self.navigationItem.setRightBarButtonItem(UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "saveTapped:"), animated: true)

对于选择器，您只需键入函数的名称，就可以了！希望它能帮上忙