如何在 ios 中的 Plist 文件中保存、检索、删除和更新我的数据？

Question

我正在创建一个 iPhone 应用程序，我可以在其中获取所有国家/地区的名称、徽标和播放器名称。 我想将该数据保存在.plist而不是sqlite服务器中。 我不知道如何在DocumentDirectory创建 plist 文件并保存数据。

请有人建议我如何将数据保存在 plist 文件中。

Answer 1

我正在通过屏幕截图并逐步完成。 请按照此操作，您将得到答案。

首先，您必须通过 Xcode 创建属性列表。

第1步

第2步

步骤：3

在保存按钮操作上保存数据：

   // Take 3 array for save the data .....

    -(IBAction)save_Action:(id)sender
    {
        NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsPath = [paths objectAtIndex:0];
        NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"manuallyData.plist"];

        [self.nameArr addObject:self.nameField.text];
        [self.countryArr addObject:self.countryField.text];
        [self.imageArr addObject:@"image.png"];

        NSDictionary *plistDict = [[NSDictionary alloc] initWithObjects: [NSArray arrayWithObjects: self.nameArr, self.countryArr, self.imageArr, nil] forKeys:[NSArray arrayWithObjects: @"Name", @"Country",@"Image", nil]];

        NSError *error = nil;
        NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];

        if(plistData)
        {
            [plistData writeToFile:plistPath atomically:YES];
            alertLbl.text = @"Data saved sucessfully";
        }
        else
        {
            alertLbl.text = @"Data not saved";
        }
    }
 // Data is saved in your plist and plist is saved in DocumentDirectory

第四步

从 plist 文件中检索数据：

    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0];
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"manuallyData.plist"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath])
    {
        plistPath = [[NSBundle mainBundle] pathForResource:@"manuallyData" ofType:@"plist"];
    }

    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
    self.nameArr = [dict objectForKey:@"Name"];
    self.countryArr = [dict objectForKey:@"Country"];

步骤：5

从 plist 文件中删除数据：

    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0];
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"manuallyData.plist"];
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithContentsOfFile:(NSString *)plistPath];

    self.nameArr = [dictionary objectForKey:@"Name"];
    self.countryArr = [dictionary objectForKey:@"Country"];

    [self.nameArr removeObjectAtIndex:indexPath.row];
    [self.countryArr removeObjectAtIndex:indexPath.row];

    [dictionary writeToFile:plistPath atomically:YES];

步骤：6

在更新单击操作上更新您的数据：

    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0];
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"manuallyData.plist"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath])
    {
        plistPath = [[NSBundle mainBundle] pathForResource:@"manuallyData" ofType:@"plist"];
    }

    self.plistDic = [[NSDictionary alloc] initWithContentsOfFile:plistPath];

    [[self.plistDic objectForKey:@"Name"] removeObjectAtIndex:self.indexPath];
    [[self.plistDic objectForKey:@"Country"] removeObjectAtIndex:self.indexPath];
    [[self.plistDic objectForKey:@"Image"] removeObjectAtIndex:self.indexPath];

    [[self.plistDic objectForKey:@"Name"] insertObject:nameField.text atIndex:self.indexPath];
    [[self.plistDic objectForKey:@"Country"] insertObject:countryField.text atIndex:self.indexPath];
    [[self.plistDic objectForKey:@"Image"] insertObject:@"dhoni.jpg" atIndex:self.indexPath];

    [self.plistDic writeToFile:plistPath atomically:YES];

Answer 2

斯威夫特 3.0

下面是在 .plist 文件中读取和写入数据的代码。

1. 创建一个 data.plist 文件。

2. 确保根对象的类型为 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() } }

输出：

<?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>

Answer 3

使用 Swift 5.0 读取、写入、更新和删除 plist 文件 Xcode 11.3 的操作

将新的 plist 文件添加到您的项目中

然后将其存储到文件夹中

当你将你的 plist 文件添加到你的项目中时，你需要从你的主包复制到这个文件到文档目录并执行操作，这里是写入、更新和删除 plist 文件的代码

//Operation Write, update and delete plist file
static func chipsOperationPropertyList(operation: chipsOperation) {
    //chipOperation is enum for add, edit and update 
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let path = paths.appending("/StoreData.plist")
    let fileManager = FileManager.default
    if (!(fileManager.fileExists(atPath: path)))
    {
        do {
            let bundlePath : NSString = Bundle.main.path(forResource: "StoreData", ofType: "plist")! as NSString
            try fileManager.copyItem(atPath: bundlePath as String, toPath: path)
        }catch {
           print(error)
        }
    }
    var plistDict:NSMutableDictionary = NSMutableDictionary(contentsOfFile: path)!
    switch operation {
       case chipsOperation.add:
            plistDict.setValue("Value", forKey: "Key")
            break
       case chipsOperation.edit:
            plistDict["Key"] = "Value1"
            break
       case chipsOperation.delete:
            plistDict.removeObject(forKey: "Key")
            break
    }
    plistDict.write(toFile: path, atomically: true)
}

最后这里是读取 plist 文件

static func readPropertyList() {

    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let path = paths.appending("/StoreData.plist")
    let plistDict = NSDictionary(contentsOfFile: path)
    print(plistDict)
}

Answer 4

简单示例

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];

Answer 5

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);

Answer 6

您已经创建了一个 plist。 此 plist 在应用程序中将保持不变。 如果要编辑此 plist 中的数据、在 plist 中添加新数据或从 plist 中删除数据，则无法在此文件中进行更改。

为此，您必须将 plist 存储在文档目录中。 您可以编辑保存在文档目录中的 plist。

在文档目录中将 plist 保存为：

NSString *filePath = [[NSBundle mainBundle] pathForResource:@”Data” ofType:@”plist”]; NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:filePath]; NSDictionary *plistDict = dict;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *error = nil;
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict
format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
if (![fileManager fileExistsAtPath: plistPath]) {
if(plistData)
    {
[plistData writeToFile:plistPath atomically:YES];
    }
}
else
{ }

从 Plist 检索数据为：

NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask,
YES);
NSString *documentsPath = [paths objectAtIndex:0];
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
NSArray *usersArray = [dict objectForKey:@"Object1"];

您可以根据需要编辑删除、添加新数据并将 plist 再次保存到文档目录。

参考： https : //medium.com/@javedmultani16/save-and-edit-delete-data-from-plist-in-ios-debfc276a2c8