Question

我正在创建一个使用Backendless来保存数据的应用。当他们对here说话时，我已经把所有东西都搞定了。

但是，当调用persistenceService方法时，应用程序崩溃：

backendless.persistenceService.of(UserSchema.ofClass()).save(user)

以下是文件的代码：

import UIKit

class SignUpViewController: UIViewController {

    @IBOutlet weak var userName: UITextField!
    @IBOutlet weak var email: UITextField!
    @IBOutlet weak var password: UITextField!
    @IBOutlet weak var firstName: UITextField!
    @IBOutlet weak var lastName: UITextField!
    @IBOutlet weak var dateOfBirth: UITextField!
    @IBOutlet weak var zip: UITextField!

    let backendless = Backendless.sharedInstance()
    // Create a new instance of UserSchema for the use of createing a new user.
    let user = UserSchema()

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func signUp() {

        // Check to make sure all fields have proper values and are not nill.
        if userName.text != nil && email.text != nil && password.text != nil && firstName.text != nil
            && lastName.text != nil && dateOfBirth != nil && zip.text != nil && Int(zip.text!) != nil {

                // Asign text from fields to the variables for the new user.
                user.userName = userName.text
                user.email = email.text
                user.password = password.text
                user.firstName = firstName.text
                user.lastName = lastName.text
                user.dateOfBirth = dateOfBirth.text
                user.zip = zip.text

                backendless.persistenceService.of(UserSchema.ofClass()).save(user)

                shouldPerformSegueWithIdentifier("succesfulSignUp", sender: nil)

        } else {
            // Alert the user if any of the values are nil so they can fix the issue.
            let emptyTextFieldAlert = UIAlertController(title: "Empty Field", message: "Please make sure all fields have proper values", preferredStyle: .Alert)
            emptyTextFieldAlert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action -> Void in
                // Do nothing
            }))
            self.presentViewController(emptyTextFieldAlert, animated: true, completion: nil)

        }
    }
}

以下是UserSchema类：

import Foundation

// Class for data that gets sent to the Backendless database

class UserSchema: NSObject {

    var zip: String?
    var userName: String?
    var password: String?
    var firstName: String?
    var lastName: String?
    var email: String?
    var dateOfBirth: String?
}

导致坠机的原因是什么？

以下是架构的屏幕截图：

这是一个repo，因此您可以克隆并测试代码。我做了一些与问题中的代码不同的更改：

https://github.com/calebkleveter/chatter

重现崩溃;运行应用程序，选择登录页面上的注册按钮，用适当的信息填写所有字段，然后点击＆＃34;注册！＆＃34;按钮。该应用程序将崩溃。

更新

我设法通过在此行放置制动点来获得日志输出

backendless.persistenceService.of(UserSchema.ofClass()).save(user)

然后踩到它，然后我穿过应用程序直到它崩溃了，我得到了这个：

2016-04-11 12:04:09.025 Chatter[21686:11538370] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000106c64e65 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x00000001090f5deb objc_exception_throw + 48
    2   CoreFoundation                      0x0000000106b23652 -[__NSPlaceholderArray initWithObjects:count:] + 290
    3   CoreFoundation                      0x0000000106b807e4 +[NSArray arrayWithObjects:count:] + 52
    4   Chatter                             0x00000001053ffc53 -[PersistenceService save:] + 409
    5   Chatter                             0x00000001052e2eb5 _TFC7Chatter20SignUpViewController6signUpfS0_FT_T_ + 8709
    6   Chatter                             0x00000001052e3452 _TToFC7Chatter20SignUpViewController6signUpfS0_FT_T_ + 34
    7   UIKit                               0x0000000107bd3194 -[UIApplication sendAction:to:from:forEvent:] + 92
    8   UIKit                               0x0000000107d426fc -[UIControl sendAction:to:forEvent:] + 67
    9   UIKit                               0x0000000107d429c8 -[UIControl _sendActionsForEvents:withEvent:] + 311
    10  UIKit                               0x0000000107d41af8 -[UIControl touchesEnded:withEvent:] + 601
    11  UIKit                               0x0000000107c4249b -[UIWindow _sendTouchesForEvent:] + 835
    12  UIKit                               0x0000000107c431d0 -[UIWindow sendEvent:] + 865
    13  UIKit                               0x0000000107bf1b66 -[UIApplication sendEvent:] + 263
    14  UIKit                               0x0000000107bcbd97 _UIApplicationHandleEventQueue + 6844
    15  CoreFoundation                      0x0000000106b90a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    16  CoreFoundation                      0x0000000106b8695c __CFRunLoopDoSources0 + 556
    17  CoreFoundation                      0x0000000106b85e13 __CFRunLoopRun + 867
    18  CoreFoundation                      0x0000000106b85828 CFRunLoopRunSpecific + 488
    19  GraphicsServices                    0x000000010b743ad2 GSEventRunModal + 161
    20  UIKit                               0x0000000107bd1610 UIApplicationMain + 171
    21  Chatter                             0x00000001052ea13d main + 109
    22  libdyld.dylib                       0x0000000109c4692d start + 1
    23  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Answer 1

原来我不小心给了APP_ID和SECRET_KEY变量相同的值。修好后一切正常！

调用Backendless方法persistenceService时，应用程序崩溃

1 个答案: