Как я могу сохранять, извлекать, удалять и обновлять свои данные в файле Plist в ios?

SWIFT 3.0

Ниже приведен код для чтения и записи данных .файл plist.

1. создайте данные.файл plist.

2. Убедитесь,что корневой объект имеет тип Dictionary.

   class PersistanceViewControllerA: UIViewController {
   
   @IBOutlet weak var nationTextField: UITextField!
   @IBOutlet weak var capitalTextField: UITextField!
   
   @IBOutlet weak var textView: UITextView!
   
   override func viewDidLoad() {
        super.viewDidLoad()
        displayNationAndCapitalCityNames()
   
   
   //Get Path
   func getPath() -> String {
     let plistFileName = "data.plist"
     let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
     let documentPath = paths[0] as NSString
     let plistPath = documentPath.appendingPathComponent(plistFileName)
     return plistPath
   }
   
   
   //Display Nation and Capital
   func displayNationAndCapitalCityNames() {
     let plistPath = self.getPath()
     self.textView.text = ""
     if FileManager.default.fileExists(atPath: plistPath) {
       if let nationAndCapitalCitys = NSMutableDictionary(contentsOfFile: plistPath) {
           for (_, element) in nationAndCapitalCitys.enumerated() {
               self.textView.text = self.textView.text + "\(element.key) --> \(element.value) \n"
           }
       }
    }
   }
   
   //On Click OF Submit
   @IBAction func onSubmit(_ sender: UIButton) {
       let plistPath = self.getPath()
       if FileManager.default.fileExists(atPath: plistPath) {
           let nationAndCapitalCitys = NSMutableDictionary(contentsOfFile: plistPath)!
           nationAndCapitalCitys.setValue(capitalTextField.text!, forKey: nationTextField.text!)
           nationAndCapitalCitys.write(toFile: plistPath, atomically: true)
       }
       nationTextField.text = ""
       capitalTextField.text = ""
       displayNationAndCapitalCityNames()
   }
   
   }
   

выход:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Canada</key>
    <string>Ottawa</string>
    <key>China</key>
    <string>Beijin</string>
    <key>Germany</key>
    <string>Berlin</string>
    <key>United Kingdom</key>
    <string>London</string>
    <key>United States of America</key>
    <string>Washington, D.C.</string>
</dict>
</plist>

Простой Пример

NSString *filePath=[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"country.plist"];

// ADD Plist File
NSMutableArray *arr=[[NSMutableArray alloc]initWithObjects:@"India",@"USA" ,nil];
[arr writeToFile:filePath atomically:YES];


//Update
NSFileManager *fm=[NSFileManager defaultManager];
[arr removeObjectIdenticalTo:@"India"];
[fm removeItemAtPath:filePath error:nil];
[arr writeToFile:filePath atomically:YES];

 // Read

    NSMutableArray *arr=[[NSMutableArray alloc]initWithContentsOfFile:filePath];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"plist.plist"]; 
NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath: path]) {
    path = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat: @"yourfilename.plist"]];
}

NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSMutableDictionary *data;

if ([fileManager fileExistsAtPath: path]) {
    data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
} else {
    // If the file doesn’t exist, create an empty dictionary
    data = [[NSMutableDictionary alloc] init];
}

//To insert the data into the plist
int value = 5;
[data setObject:[NSNumber numberWithInt:value] forKey:@"value"];
[data writeToFile: path atomically:YES];

//To retrieve the data from the plist
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
int savedvalue;
savedvalue = [[savedStock objectForKey:@"value"] intValue];
NSLog(@“%d”, savedvalue);