ios - 无法识别的选择器发送到实例 0x7f995be07650

Question

这个问题已经有答案了:

Swift 4: Timer Crashing - unrecognized selector sent to instance (1 个回答)

已关闭 4 年前。

我有最新更新的 Xcode。我刚刚开始学习 swift，但遇到错误。请帮忙。谢谢

2018-07-31 06:30:29.085754+1200 swift4[2874:61277] -[swift4.ViewController uda1]: unrecognized selector sent to instance 0x7fe13f6122a02018-07-31 06:30:29.089728+1200 swift4[2874:61277] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[swift4.ViewController uda1]: unrecognized selector sent to instance 0x7fe13f6122a0'*** First throw call stack:(    0   CoreFoundation                      0x0000000102dfd1e6 __exceptionPreprocess + 294    1   libobjc.A.dylib                     0x0000000102492031 objc_exception_throw + 48    2   CoreFoundation                      0x0000000102e7e784 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132    3   UIKit                               0x00000001034a86db -[UIResponder doesNotRecognizeSelector:] + 295    4   CoreFoundation                      0x0000000102d7f898 ___forwarding___ + 1432    5   CoreFoundation                      0x0000000102d7f278 _CF_forwarding_prep_0 + 120    6   Foundation                          0x0000000101efc4dd __NSFireTimer + 83    7   CoreFoundation                      0x0000000102d8ce64 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20    8   CoreFoundation                      0x0000000102d8ca52 __CFRunLoopDoTimer + 1026    9   CoreFoundation                      0x0000000102d8c60a __CFRunLoopDoTimers + 266    10  CoreFoundation                      0x0000000102d83e4c __CFRunLoopRun + 2252    11  CoreFoundation                      0x0000000102d8330b CFRunLoopRunSpecific + 635    12  GraphicsServices                    0x00000001089d1a73 GSEventRunModal + 62    13  UIKit                               0x000000010327a057 UIApplicationMain + 159    14  swift4                              0x0000000101b86927 main + 55    15  libdyld.dylib                       0x000000010720d955 start + 1)libc++abi.dylib: terminating with uncaught exception of type NSException(lldb) 

I'm getting error:

In my Viewcontroller:

import UIKit

class ViewController: UIViewController {
    var timer1 = Timer()
    var  counter  = 0

    @IBOutlet weak var Label: UILabel!

    @IBAction func Start(_ sender: Any) {
        counter = 0
        Label.text = String (counter)

        timer1 = Timer.scheduledTimer(timeInterval: 1, target: self, selector: ("uda1") , userInfo: nil, repeats: true);
    }

    func uda1 ()
    {
        counter += 1
        Label.text = String(counter)
    }

    @IBAction func Stop(_ sender: Any) {
        timer1.invalidate()
    }
}

Answer 1

你可以试试

 timer1 = Timer.scheduledTimer(timeInterval: 1, target: self, #selector(uda1) , userInfo: nil, repeats: true);

//

@objc func uda1()
{
    counter += 1
    Label.text = String(counter)

}

//

var timer1:Timer?

//

timer1?.invalidate()