Question

我到处寻找，但找不到此代码无效的原因。我正在尝试初始化我的User类，它将与Firebase一起使用，因此我需要初始化字典以便能够检索JSON数据。我已经做了很多次这样的事情并且没有任何问题但是由于某种原因，这次xcode给了我＆＃34;从初始化器返回而没有初始化所有存储的属性＆＃34;。从我所看到的所有属性都被初始化。我错过了什么吗？提前谢谢您的支持！

    enum UserAccessLevel: String {
    case unknown = "Unknown"
    case executiveProducer = "Executive Producer"
    case topTierProducer = "Top Tier Producer"
    case lowTierProducer = "Low Tier Producer"
    case crew = "Crew Member"
    case vendor = "Vendor"
    case talent = "Talent"
}

enum Access: String {
    case granted = "true"
    case denied = "false"
}

enum FIRUserData: String {
    case firstName = "firstName"
    case lastName = "lastName"
    case city = "city"
    case state = "state"
    case profileImage = "profileImage"
    case userName = "userName"
    case accessLevel = "accessLevel"
}

protocol User {
    var firstName: String { get set }
    var lastName: String { get set }
    var city: String { get set }
    var state: USAState { get set }
    var profileImage: String { get set }
    var userName: String { get set }
    var accessLevel: UserAccessLevel { get set }

    func createUser() throws
    func signInUser() throws
    func signOutUser()
    func archiveProject()
    func activateProject()
    func deleteProject()
}

class UserType: User {
    var firstName: String
    var lastName: String
    var city: String
    var state: USAState
    var profileImage: String
    var userName: String
    var accessLevel: UserAccessLevel

    init(firstName: String, lastName: String, city: String, state: USAState, profileImage: String, u accessLevel: UserAccessLevel) {
        self.firstName = firstName
        self.lastName = lastName
        self.city = city
        self.state = state
        self.profileImage = profileImage
        self.userName = "\(firstName).\(lastName)"
        self.accessLevel = accessLevel
    }

    init(userName: String, userData: Dictionary <String, Any>) {
        self.userName = userName

        if let firstName = userData[FIRUserData.firstName.rawValue] {
            self.firstName = firstName as! String
        }
        if let lastName = userData[FIRUserData.lastName.rawValue] {
           self.lastName = lastName as! String
        }
        if let city = userData[FIRUserData.city.rawValue] {
            self.city = city as! String
        }
        if let state = userData[FIRUserData.state.rawValue] {
            self.state = state as! USAState
        }
        if let profileImage = userData[FIRUserData.profileImage.rawValue] {
            self.profileImage = profileImage as! String
        }
        if let accessLevel = userData[FIRUserData.accessLevel.rawValue] {
            self.accessLevel = accessLevel as! UserAccessLevel
        }


    }

Answer 1

在你的init类的第二个UserType中，Xcode并不认为保证设置所有类属性，因为if语句可能会失败。

解决方案是为您的所有else语句添加if块：

init(userName: String, userData: Dictionary <String, Any>) {
    self.userName = userName

    if let firstName = userData[FIRUserData.firstName.rawValue] as? String {
        self.firstName = firstName
    } else {
        firstName = //something else
    }

    //do the same thing with other if statements
}

Answer 2

如果pickup_date_time_from = DateTimeField(input_formats=["%m/%d/%Y %I:%M %p"])字典中缺少值，则第二个初始值设定项不会初始化字段。在这种情况下，您需要决定UserType的字段会发生什么。

Swift从初始化程序返回而不初始化所有存储的属性

2 个答案: