是否可以在 iOS 中将 NSMutableArray 或 NSDictionary 数据保存为文件？

发布于 2024-09-25 12:23:42 字数 116 浏览 8 评论 0原文

我想将 NSMutableArray 或 NSDictionary 保存为永久文件。然后，我想稍后重新打开该文件。

这可能吗？如果是这样，我该怎么办？

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不乱于心 2024-10-02 12:23:42

写入文件

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:FILE_NAME];

[myArray writeToFile:filePath atomically:YES];

如果文件不存在，则从文件读取

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:FILE_NAME];

myArray = [NSArray arrayWithContentsOfFile:filePath];

myArray 将为 nil。 NSDictionary也有类似的方法。请检查参考资料以了解这些方法的详细信息。

To write in file

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:FILE_NAME];

[myArray writeToFile:filePath atomically:YES];

To read from file

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:FILE_NAME];

myArray = [NSArray arrayWithContentsOfFile:filePath];

myArray will be nil if file is not present. And NSDictionary has similar methods. Please check the reference for the details of these methods.

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念三年u 2024-10-02 12:23:42

也许您可以将字典转换为 JSON 数据，并将其写入文件。

NSDictionary *dict = /* the NSDictionary/NSArray you need to write */

NSError *writeError = nil;
NSData* data;
data = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&writeError];

if (!writeError) {
    [data writeToFile:filePath atomically:YES];
}

May be you can convert a Dictionary to JSON data.and write it to a file.

NSDictionary *dict = /* the NSDictionary/NSArray you need to write */

NSError *writeError = nil;
NSData* data;
data = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&writeError];

if (!writeError) {
    [data writeToFile:filePath atomically:YES];
}

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~没有更多了~