是否可能保存NSMutableArray或NSDictionary数据作为文件在iOS中？ [英] is it possible to save NSMutableArray or NSDictionary data as file in iOS?

问题描述

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

I want to save an NSMutableArray or NSDictionary as a permanent file. Then, I would like to reopen the file later.

这是可能吗？

推荐答案

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

[myArray writeToFile:filePath atomically:YES];

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];

如果文件不存在，myArray将为nil。和NSDictionary有类似的方法。请检查这些方法的详细信息的参考。

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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