如何通过编程方式删除一个plist文件？

Question

我可以帮您进行翻译。这段文本是关于编程的，询问如何在程序中删除整个plist文件。以下是我翻译的结果：

我想要在程序中自动删除整个plist文件系统。我该如何实现？

这是我写入plist的方式：

+ (void)writeObjectToPList:(id)myData {  
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];
    [myData writeToFile:path atomically:YES];
}  

- Sheehan Alam

Answer 1

NSFileManager可以使用removeItemAtPath:error:方法帮助你删除文件。

+ (void)deletePList {  
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];

    NSError *error;
    if(![[NSFileManager defaultManager] removeItemAtPath:path error:&error])
    {
        //TODO: Handle/Log error
    }
}

- Joe

Answer 2

这是如何做到的。

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:@"mobile-watchlist.plist"];
    [fileManager removeItemAtPath: fullPath error:NULL];

- Manish Burman

---

你不希望出现空错误，你应该像Joe一样处理可能存在的错误。 - Matt S.

Answer 3

这是我的一种方法，可以在保留当前plist的情况下删除所有旧的plists。它基于Swift 3：

func removeOldPlistFiles() {

    let fileManager = FileManager.default

    // get directory with your current plist for comparison later
    let directory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
    let destPath = (dir as NSString).appendingPathComponent("YourCurrentPlistName.plist")

    // Get the documents directory url
    let documentsUrl =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!

    do {

        // Get the documents directory contents urls (including subfolders urls)
        let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil, options: [])

        // filter the directory contents and get file names
        let plistFiles = directoryContents.filter{ $0.pathExtension == "plist" }
        let plistFileNames = plistFiles.map{ $0.deletingPathExtension().lastPathComponent }

        for nameFile in plistFileNames {

            let dir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
            let item = (dir as NSString).appendingPathComponent("\(nameFile).plist")

            if item != self.destPath! {

                do {

                    try fileManager.removeItem(atPath: item)
                }

                catch let error as NSError {

                    print("FimeManager Remove Item error: \(error.debugDescription)")
                }
            }
        }

    } catch let error as NSError {

        print("Directory Contents error: \(error.localizedDescription)")
    }
}

我觉得这段代码虽然能用，但还有改进的空间。如果有人有什么见解，请分享。

- Paula Hasstenteufel

Answer 4

这将删除文档文件夹中的所有文件。如果应用程序存储您不想删除的文件在此目录中，请添加代码以确保这些文件不被删除。

NSError *errorGettingAllBanners = nil;
for (NSString *file in [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] error:&errorGettingAllBanners]) {
    NSError *errorDeletingAllBanners = nil;
    [[NSFileManager defaultManager] removeItemAtPath:[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:file] error:&errorDeletingAllBanners];
}

- Bobby