是否可以将 NSMutableArray 或 NSDictionary 数据保存为 iOS 中的文件？
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is it possible to save NSMutableArray or NSDictionary data as file in iOS?
提问by RAGOpoR
I want to save an NSMutableArrayor NSDictionaryas a permanent file. Then, I would like to reopen the file later.
我想将NSMutableArray或保存NSDictionary为永久文件。然后，我想稍后重新打开该文件。
Is this possible? If so, how can I do it?
这可能吗？如果是这样，我该怎么做？
回答by taskinoor
To write in file
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];
To read from file
从文件中读取
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.
如果文件不存在，myArray 将为 nil。而 NSDictionary 也有类似的方法。请查看参考资料以了解这些方法的详细信息。
回答by Hancock_Xu
May be you can convert a Dictionary to JSON data.and write it to a file.
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];
}
