ios - 崩溃 : com. apple.main-thread - 应用程序在警戒语句中随机崩溃

Question

我在实时应用程序中随机崩溃。它在 guard 声明中崩溃。以下是代码片段。我无法理解为什么它会在警戒时崩溃，这应该是为了防止这样的崩溃？

如何解决此问题或如何进行调查？

崩溃分析日志

Crashed: com.apple.main-thread
EXC_BREAKPOINT 0x0000000102419850

0  myApp                          0x102426f50 MessageVC.validate() + 101 (MessageVC.swift:101)
1  myApp                          0x1024272d8 @objc MessageVC.buttonTapped(_:) + 239 (MessageVC.swift:239)
2  UIKitCore                      0x1a6a8d9ac <redacted> + 96
3  UIKitCore                      0x1a64c3fbc <redacted> + 240
4  UIKitCore                      0x1a64c4320 <redacted> + 408
5  UIKitCore                      0x1a64c333c <redacted> + 520
6  UIKitCore                      0x1a6674a58 <redacted> + 7636
7  CoreFoundation                 0x1a2983e68 <redacted> + 32
8  CoreFoundation                 0x1a297ed54 <redacted> + 416
9  CoreFoundation                 0x1a297f320 <redacted> + 1308
10 CoreFoundation                 0x1a297eadc CFRunLoopRunSpecific + 464
11 GraphicsServices               0x1ac91f328 GSEventRunModal + 104
12 UIKitCore                      0x1a6a8c63c UIApplicationMain + 1936
13 myApp                          0x1023eb850 main + 21 (ProfileVC.swift:11)
14 libdyld.dylib                  0x1a2808360 <redacted> + 4

模型.swift

struct ProfileStatus: Decodable {
    var status: Bool?
    var error: String?
}

MessageVC.swift

var profileStatus: ProfileStatus!

func validate() -> Bool {

    guard let status = profileStatus.status else { // Line no. 101, Crash here
        return true
    }
    // Do something...
}

@IBAction func buttonTapped(_ sender: UIButton) {
    if validate() { // Line no. 239
        // Do something..
    }
}

ProfileVC.swift

class ProfileVC: UIViewController {
    @IBOutlet weak var textField: MyTextField! // Line no. 11
    // ....
}

Answer 1

强制解包崩溃的原因

var profileStatus: ProfileStatus! // << here is the reason

所以你需要在其他代码中找到所有权丢失的地方，而且，这无论如何都是好习惯

var profileStatus: ProfileStatus? // use optional and unwrap where needed conditonally

func validate() -> Bool {

    guard let status = profileStatus?.status else {