Storing data in Swift iOS app for later use

问题

I am writing an iOS app in Swift and the app collects user input from multiple app screens and in the last screen its supposed to POST the information collected to the server via API.

Now my question is, what is the best way to manage the collected data on the app? Should I use plist to save my form data ? It also has one image which I want to upload to my server from the final screen. How should I go about this?

PS: I also read about http://developer.apple.com/CoreData, but I'm not sure if this is the right way to go forward.

Any suggestion is greatly appreciated.

回答1:

UPDATE: to save your time - this is Swift 1.2 solution. I didn't test it on Swift 2 (likely secureValue flow have to be updated)

Looks like you are talking about user's details/profile (correct me if I wrong), for this amount of data - using NSUserDefault is totally ok.

For user preferences (if that the case!!) I would use something like Preference Manager:

import Foundation
import Security

class PreferencesManager {

    class  func saveValue(value: AnyObject?, key: String) {

        NSUserDefaults.standardUserDefaults().setObject(value, forKey: key)
        NSUserDefaults.standardUserDefaults().synchronize()

    }
    class  func loadValueForKey(key: String) -> AnyObject? {
        let r : AnyObject? = NSUserDefaults.standardUserDefaults().objectForKey(key)
        return r

    }

    class  func saveSecureValue(value: String?, key: String) {
        var dict = dictForKey(key)
        if let v = value {
            var data: NSData = v.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
            (SecItemDelete(dict as NSDictionary as CFDictionary))
            dict[kSecValueData as NSString] = v.dataUsingEncoding(NSUTF8StringEncoding,
                allowLossyConversion:false);
            var status = SecItemAdd(dict as NSDictionary as CFDictionary, nil)
        } else {
            var status = SecItemDelete(dict as NSDictionary as CFDictionary)
        }
    }

    class  func loadSecureValueForKey(key: String) -> String? {
        var dict = dictForKey(key)
        dict[kSecReturnData as NSString] = kCFBooleanTrue
        var dataRef: Unmanaged<AnyObject>?
        var value: NSString? = nil
        var status = SecItemCopyMatching(dict as NSDictionary as CFDictionary, &dataRef)
        if 0 == status {
            let opaque = dataRef?.toOpaque()
            if let op = opaque {
                value = NSString(data: Unmanaged<NSData>.fromOpaque(op).takeUnretainedValue(),
                    encoding: NSUTF8StringEncoding)
            }
        }

        let val :String? =  value as? String
        return val
    }

    class private func dictForKey(key: String) -> NSMutableDictionary {
        var dict = NSMutableDictionary()
        dict[kSecClass as NSString] = kSecClassGenericPassword as NSString
        dict[kSecAttrService as NSString] = key
        return dict
    }

}

You can use PreferencesManager.saveSecureValue for secure data (like password etc) and PreferencesManager.saveValue for the rest of values

来源：https://stackoverflow.com/questions/32307648/storing-data-in-swift-ios-app-for-later-use

标签

ios

swift

persistent-storage