在 Xcode 8/Swift 3 中按下 UIButton 时出现“无法识别的选择器发送到实例”错误
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"Unrecognized selector sent to instance" error when pressing UIButton in Xcode 8/Swift 3
提问by Will Titus
I am making an app that requires a user to press one of two UIButtonsand then prints a response depending on which button was pressed (determined based on the tag of the button pressed). However, when I run press button, I get an
我正在制作一个应用程序，要求用户按下两个按钮之一，UIButtons然后根据按下的按钮（根据按下的按钮的标签确定）打印响应。但是，当我运行按下按钮时，我得到一个
Unrecognized selector sent to instance
无法识别的选择器发送到实例
How do I resolve this?
我该如何解决？
Here's my code. The IBActionat the bottom refers to the UIButtonsthat are causing the error:
这是我的代码。该IBAction底部是指UIButtons那些会导致错误：
import UIKit
class ViewController: UIViewController {
let story1 = "This is the story."
let answer1 = "No change"
let answer2 = "Lose 1 health"
var healthStat : Int = 10
@IBOutlet weak var storyText: UILabel!
@IBOutlet weak var health: UILabel!
@IBOutlet weak var restartButton: UILabel!
@IBOutlet weak var choiceOne: UIButton!
@IBOutlet weak var choiceTwo: UIButton!
var storyIndex = 1
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
storyText.text = story1
choiceOne.setTitle("\(answer1)", for: .normal)
choiceTwo.setTitle("\(answer2)", for: .normal)
health.text = String("Health: \(healthStat)")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func buttonPressed(_ sender: UIButton) {
if sender.tag == 1 {
print("Option 1 selected")
}
else if sender.tag == 2 {
print("Option 2 selected. Lose 1 health.")
healthStat = healthStat - 1
}
}
}
Here is the entirety of the error:
这是错误的全部内容：
2017-07-29 21:45:24.626 Choose Your Own Adventure[16001:694686] -[Choose_Your_Own_Adventure.ViewController buttonOnePressed:]: unrecognized selector sent to instance 0x7fc199c0cfe0
2017-07-29 21:45:24.638 Choose Your Own Adventure[16001:694686] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Choose_Your_Own_Adventure.ViewController buttonOnePressed:]: unrecognized selector sent to instance 0x7fc199c0cfe0'
*** First throw call stack:
(
0 CoreFoundation 0x0000000113504b0b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000011037e141 objc_exception_throw + 48
2 CoreFoundation 0x0000000113574134 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x000000011348b840 ___forwarding___ + 1024
4 CoreFoundation 0x000000011348b3b8 _CF_forwarding_prep_0 + 120
5 UIKit 0x0000000110c66d82 -[UIApplication sendAction:to:from:forEvent:] + 83
6 UIKit 0x0000000110deb5ac -[UIControl sendAction:to:forEvent:] + 67
7 UIKit 0x0000000110deb8c7 -[UIControl _sendActionsForEvents:withEvent:] + 450
8 UIKit 0x0000000110dea802 -[UIControl touchesEnded:withEvent:] + 618
9 UIKit 0x0000000110cd47ea -[UIWindow _sendTouchesForEvent:] + 2707
10 UIKit 0x0000000110cd5f00 -[UIWindow sendEvent:] + 4114
11 UIKit 0x0000000110c82a84 -[UIApplication sendEvent:] + 352
12 UIKit 0x00000001114665d4 __dispatchPreprocessedEventFromEventQueue + 2926
13 UIKit 0x000000011145e532 __handleEventQueue + 1122
14 CoreFoundation 0x00000001134aac01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
15 CoreFoundation 0x00000001134900cf __CFRunLoopDoSources0 + 527
16 CoreFoundation 0x000000011348f5ff __CFRunLoopRun + 911
17 CoreFoundation 0x000000011348f016 CFRunLoopRunSpecific + 406
18 GraphicsServices 0x000000011542da24 GSEventRunModal + 62
19 UIKit 0x0000000110c65134 UIApplicationMain + 159
20 Choose Your Own Adventure 0x000000010fd9efa7 main + 55
21 libdyld.dylib 0x00000001144a465d start + 1
22 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
回答by Hussain Shabbir
It seems like you have rename your IBActionmethod name earlier it was different and it is connected to the previous name inside your storyboard. So just disconnect your action method and reconnect it appropriately.
看起来您之前已经重命名了您的IBAction方法名称，但它是不同的，并且它与故事板中的先前名称相关联。因此，只需断开您的操作方法并适当地重新连接即可。
