ios - 在 segue 中使用类时遇到问题
问题描述
试图让“编辑”VC 将用户通过 Storyboard segue 更新的新信息传递回“显示”VC,但难以将用户输入存储到我的初始化类“事件”中
我不断收到此错误
Cannot invoke initializer for type 'Event' with an argument list of type '(eventName: String, eventLocation: String, eventStart: String, eventDescription: String, eventHost: String)'
我的编辑(来源)VC(准备中的错误......)
class EditEventDetailTableViewController: UITableViewController {
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var eventName: UITextField!
@IBOutlet weak var eventStartDate: UITextField!
@IBOutlet weak var eventLocation: UITextField!
@IBOutlet weak var eventDescription: UITextView!
@IBOutlet weak var eventHost: UITextField!
var event:Event?
var eventUpdate:Event?
override func viewDidLoad() {
super.viewDidLoad()
//imageView.image = detail?.photo
eventName.text = event?.eventName
eventStartDate.text = event?.eventStart
eventLocation.text = event?.eventLocation
eventDescription.text = event?.eventDescription
eventHost.text = event?.eventHost
guard let urlString = (event?.eventCoverUrl) else { return }
let url = URL(string: urlString)
guard url != nil else {
//Couldn't create url object
return
}
self.imageView.sd_setImage(with: url) { (image, error, cacheType, url) in
self.imageView.image = image
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let eventName = eventName.text?.trimmingCharacters(in: .whitespacesAndNewlines),
let eventStart = eventStartDate.text?.trimmingCharacters(in: .whitespacesAndNewlines),
let eventLocation = eventLocation.text?.trimmingCharacters(in: .whitespacesAndNewlines),
let eventDescription = eventDescription.text?.trimmingCharacters(in: .whitespacesAndNewlines),
let eventHost = eventHost.text?.trimmingCharacters(in: .whitespacesAndNewlines) {
self.event = Event(eventName: eventName, eventLocation: eventLocation, eventStart: eventStart, eventDescription: eventDescription, eventHost: eventHost)
}}}
这是我的课
class Event {
var adminUser:String?
var eventCreated:Date?
var eventId:String?
var eventName:String?
var eventCoverUrl:String?
var eventLocation:String?
var eventStart:String?
var eventEnd:Date?
var eventStatus:String?
//var eventParticipants: [String?]
var eventDescription:String?
var eventDeleteDate:Date?
var eventHost:String?
init?(snapshot:DocumentSnapshot){
self.eventId = snapshot.get("eventId") as? String ?? "No event Id"
self.adminUser = snapshot.get("adminUser") as? String ?? "No admin user"
//self.eventCreated = snapshot.get("eventCreated") as? Date ?? "No Event Created Date"
self.eventName = snapshot.get("eventName") as? String ?? "No Event Name"
self.eventCoverUrl = snapshot.get("eventCoverUrl") as? String ?? "No Cover URL"
self.eventLocation = snapshot.get("eventLocation") as? String ?? "No Location"
self.eventStart = snapshot.get("eventStart") as? String ?? "No Start Date"
self.eventDescription = snapshot.get("eventDescription") as? String ?? "No Event Description"
self.eventHost = snapshot.get("eventHost") as? String ?? "No Event Host"
self.eventStatus = snapshot.get("eventStatus") as? String ?? "No Event Status"
}
init(adminUser:String?, eventId:String?, eventName:String?, eventCoverUrl:String?, eventLocation:String?, eventStart:String?, eventStatus:String?, eventDescription:String?, eventHost:String?) {
self.adminUser = adminUser ?? "No \(LocalizedError.self)"
self.eventId = eventId ?? "No \(LocalizedError.self)"
self.eventName = eventName ?? "No \(LocalizedError.self)"
self.eventCoverUrl = eventCoverUrl ?? "No \(LocalizedError.self)"
self.eventLocation = eventLocation ?? "No \(LocalizedError.self)"
self.eventStart = eventStart ?? "No \(LocalizedError.self)"
self.eventStatus = eventStatus ?? "No \(LocalizedError.self)"
self.eventDescription = eventDescription ?? "No \(LocalizedError.self)"
self.eventHost = eventHost ?? "No \(LocalizedError.self)"
}
}
我尝试了很多方法,但没有任何方法可以让我将用户输入用于编辑字段以创建“事件”,然后通过已经工作的展开 segue 将其传递到我的显示(目标)VC。
这是 Event 类的更新代码,更新的参数初始化为空白字符串。其他一切都保持原样。
var adminUser = ""
var eventCreated = ""
var eventId = ""
var eventName = ""
var eventCoverUrl = ""
var eventLocation = ""
var eventStart = ""
var eventEnd:Date?
var eventStatus:String?
//var eventParticipants: [String?]
var eventDescription = ""
var eventDeleteDate = ""
var eventHost = ""
解决方案
您不能将参数排除在函数调用之外。未定义,Event(eventName, eventLocation, eventStart, eventDescription, eventHost)
因为实际方法是Event(adminUser, eventId, eventName, eventCoverUrl, eventLocation, eventStart, eventStatus, eventDescription, eventHost)
您需要将 prepareForSegue 中的最后一行更改为:
self.event = Event(adminUser: adminUser, eventId: eventId, eventName: eventName, eventCoverUrl: eventCoverUrl, eventLocation: eventLocation, eventStart: eventStart, eventStatus:eventStatus, eventDescription: eventDescription, eventHost: eventHost)
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