write plist file swift - ios

Question

i have a plist file, this file populate a form with settings; when I finish writing each textfield or switch, value is saved correctly, refresh my table correctly and my info its correct. But when i change the screen and return, my plist file is empty, i check several options:
...
let path = NSBundle.mainBundle().pathForResource("perfilBitrubian", ofType: "plist")
descripcionCelda.writeToFile(path!, atomically: false)
or
...
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
let documentsDirectory = paths.objectAtIndex(0) as! NSString
let path = documentsDirectory.stringByAppendingPathComponent("perfilBitrubian.plist")
descripcionCelda.writeToFile(path!, atomically: false)
My list has hidden options; when i hide and show my table refresh data correctly, but if i change the process and return the form; my plist file don't have info.
i see this examples and I do not know what to do.
http://rebeloper.com/read-write-plist-file-swift/
and this:
http://www.appcoda.com/expandable-table-view/
Thanks!

Answer 1

Several things:
First, your first code block won't work. The app bundle is read-only. Trying to write a file to the bundle will always fail.
Next, property lists can only contain a very small set of objects, all of which must be NSObjects. Do a search on "property list object" in Xcode for more info.
The function writeToFile that you are calling (on a dictionary or array?) returns a Bool. Check the result to see if it's failing.

Answer 2

These are my methods, you have to pass the plist name (without extension), to write also pass the key and a dictionary or an array.
The plist is automatically copied to documents directory if not already done before:
public static func plistRead(plistName: String) -> [String: AnyObject]? {
let path = documentsPath().stringByAppendingPathComponent(plistName + ".plist")
let fileManager = NSFileManager.defaultManager()
if !(fileManager.fileExistsAtPath(path)) {
if let bundlePath = NSBundle.mainBundle().pathForResource(plistName, ofType: "plist") {
do {
try fileManager.copyItemAtPath(bundlePath, toPath: path)
} catch let error as NSError {
print("Can't move plist from bundle to documents directory: " + error.localizedDescription)
}
} else {
print("No plist found!")
}
}
return NSDictionary(contentsOfFile: path) as? [String: AnyObject]
}
public static func plistWrite(plistName: String, key: String, data: AnyObject?) -> Bool {
let path = documentsPath().stringByAppendingPathComponent(plistName + ".plist")
let fileManager = NSFileManager.defaultManager()
if !(fileManager.fileExistsAtPath(path)) {
if let bundlePath = NSBundle.mainBundle().pathForResource(plistName, ofType: "plist") {
do {
try fileManager.copyItemAtPath(bundlePath, toPath: path)
} catch let error as NSError {
print("Can't move plist from bundle to documents directory: " + error.localizedDescription)
return false
}
} else {
print("No plist found!")
return false
}
}
if let savedStock = NSMutableDictionary(contentsOfFile: path) {
if let data = data { savedStock.setObject(data, forKey: key) }
else { savedStock.removeObjectForKey(key) }
if savedStock.writeToFile(path, atomically: true) { return true }
else {
print("Can't save file at path: \(path)")
return false
}
}
else {
print("Can't create dictionary!")
return false
}
}

Answer 3

Update swift 3
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
let documentDirectory = paths[0] as! String
let path = documentDirectory.appending("myData.plist")
let fileManager = FileManager.default
if(!fileManager.fileExists(atPath: path)){
if let bundlePath = Bundle.main.path(forResource: "myData", ofType: "plist"){
let result = NSMutableDictionary(contentsOfFile: bundlePath)
print("Bundle file myData.plist is -> \(result?.description)")
do{
try fileManager.copyItem(atPath: bundlePath, toPath: path)
}catch{
print("copy failure.")
}
}else{
print("file myData.plist not found.")
}
}else{
print("file myData.plist already exits at path.")
}
let resultDictionary = NSMutableDictionary(contentsOfFile: path)
print("load myData.plist is ->\(resultDictionary?.description)")
let myDict = NSDictionary(contentsOfFile: path)
if let dict = myDict{
myItemValue = dict.object(forKey: myItemKey) as! String?
txtValue.text = myItemValue
}else{
print("load failure.")
}
Read and write plist file switf

Answer 4

class MainTableViewController: UITableViewController {
//MARK:- Properties
//reading data
var tableData = [String]()
//writing data
var dicData: NSMutableDictionary = ["name" : "data"]
//MARK:- View Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
/* converting path to document directory since plist in bundle can't be modified */
let documentsDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let path : NSString = documentsDirectory.appendingPathComponent("TableDataPropertyList.plist") as NSString
/* getting the path and paste the path in finder to see the plist in document directory */
print(" \(path) ")
dicData.write(toFile: path as String, atomically: false)
//path of plist in bundle to read
let mainPath = Bundle.main.path(forResource: "TableDataPropertyList", ofType: "plist")
let dict = NSDictionary(contentsOfFile: (mainPath)! as String)
tableData = dict!.object(forKey: "AppleDevice") as! [String]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CellIdentifier", for: indexPath as IndexPath)
cell.textLabel!.text = tableData[indexPath.row]
return cell
}
}