Question

所以即使我的代码没有错，我也收到了NSException错误。在我获得NSException之前，我添加了一个文件私有函数here

fileprivate func uploadToFirebaseStorageUsingImage(image: UIImage) {
    let imageName = UUID().uuidString
    let ref = Storage.storage().reference().child("message_images").child("\(imageName).jpg")

    if let uploadData = UIImageJPEGRepresentation(image, 0.2) {

        ref.putData(uploadData, metadata: nil, completion: { (metadata, error) in

            if error != nil {
                print("Failed to upload image:", error!)
                return
            }

            ref.downloadURL(completion: { (url, error) in

                guard let downloadURL = url else{
                    print("an error occured")
                    return
                }

                let imageUrl = downloadURL.absoluteString
                self.sendMessageWithImageUrl(imageUrl, image: image)

            })
        })
    }
}

完整错误here

2018-08-23 14:48:04.985710+0700 nextstore[33702:369585] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<nextstore.User 0x60800011f920> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key name.'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000109d251e6 __exceptionPreprocess + 294
    1   libobjc.A.dylib                     0x00000001093ba031 objc_exception_throw + 48
    2   CoreFoundation                      0x0000000109d250b9 -[NSException raise] + 9
    3   Foundation                          0x00000001086c8b47 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292
    4   Foundation                          0x0000000108726c02 -[NSObject(NSKeyValueCoding) setValuesForKeysWithDictionary:] + 283
    5   nextstore                           0x000000010724da39 _T09nextstore18MessagesControllerC28fetchUserAndSetupNavBarTitleyyFySo12DataSnapshotCcfU_ + 713
    6   nextstore                           0x000000010724db1d _T09nextstore18MessagesControllerC28fetchUserAndSetupNavBarTitleyyFySo12DataSnapshotCcfU_TA + 13
    7   nextstore                           0x00000001072338d2 _T0So12DataSnapshotCIegx_ABIeyBy_TR + 66
    8   nextstore                           0x000000010730d0e6 __71-[FIRDatabaseQuery observeSingleEventOfType:withBlock:withCancelBlock:]_block_invoke + 118
    9   nextstore                           0x000000010730d5c8 __92-[FIRDatabaseQuery observeSingleEventOfType:andPreviousSiblingKeyWithBlock:withCancelBlock:]_block_invoke + 184
    10  nextstore                           0x00000001072ebc1a __43-[FChildEventRegistration fireEvent:queue:]_block_invoke.68 + 122
    11  libdispatch.dylib                   0x000000010da737ab _dispatch_call_block_and_release + 12
    12  libdispatch.dylib                   0x000000010da747ec _dispatch_client_callout + 8
    13  libdispatch.dylib                   0x000000010da7f8cf _dispatch_main_queue_callback_4CF + 628
    14  CoreFoundation                      0x0000000109ce7c99 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    15  CoreFoundation                      0x0000000109cabea6 __CFRunLoopRun + 2342
    16  CoreFoundation                      0x0000000109cab30b CFRunLoopRunSpecific + 635
    17  GraphicsServices                    0x000000010ef06a73 GSEventRunModal + 62
    18  UIKit                               0x000000010ad94057 UIApplicationMain + 159
    19  nextstore                           0x000000010726e5c7 main + 55
    20  libdyld.dylib                       0x000000010daf1955 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

我的代码没有任何错误。但是当我使用模拟器运行时，一旦打开应用程序，它将立即崩溃我的问题有什么解决办法吗，谢谢你

编辑

我的用户类是这样的：

 class User: NSObject {
    var id: String?
    var name: String?
    var email: String?
    var profileImageUrl: String?

    init(dictionary: [String: AnyObject]) {
        self.id = dictionary["id"] as? String
        self.name = dictionary["name"] as? String
        self.email = dictionary["email"] as? String
        self.profileImageUrl = dictionary["profileImageUrl"] as? String
    }
}

Answer 1

该错误与该功能无关。堆栈跟踪表明您正在某个地方调用KVC方法setValuesForKeys。在错误发生的地方。

要使类键值兼容，必须将@objc dynamic属性添加到每个受影响的属性

class User: NSObject {
    @objc dynamic var id: String?
    @objc dynamic var name: String?
    @objc dynamic var email: String?
    @objc dynamic var profileImageUrl: String?

    init(dictionary: [String: AnyObject]) {
        self.id = dictionary["id"] as? String
        self.name = dictionary["name"] as? String
        self.email = dictionary["email"] as? String
        self.profileImageUrl = dictionary["profileImageUrl"] as? String
    }
}

或者忽略所有@objc属性，并在类前面添加@objcMembers。

@objcMembers
class User: NSObject {
    dynamic var id: String?
    dynamic ...

基本上，我们还是不鼓励在Swift中使用这些KVC方法。

获取NSException错误崩溃应用

1 个答案: