将文件保存在可可 [英] Saving files in cocoa

问题描述

我相信这是一个很容易回答的问题，但我还是新可可。我需要保存我的应用程序数据。该应用程序有4个文本字段，每个字段需要保存到一个文件。然后当你打开文件，它需要知道什么在什么字段。我真的坚持这一点。此外，我知道如何使用保存面板。

I'm sure this is a really easy to answer question but I'm still new to cocoa. I need to save my applications data. The app has 4 text fields and each field needs to be saved into one file. Then when you open the file it needs to know what goes in what field. I'm really stuck with this. Also, I do know how to use the save panel.

推荐答案

一种方便的方法是使用 PLists ：

A convenient way would be to use PLists:

NSDictionary *arr = [NSDictionary dictionaryWithObjectsAndKeys:
                      string1, @"Field1", string2, @"Field2", nil];
NSData *data = [NSPropertyListSerialization dataFromPropertyList:arr
                format:NSPropertyListXMLFormat_v1_0 errorDescription:nil];

NSSavePanel *panel = [NSSavePanel savePanel];

NSInteger ret = [panel runModal];
if (ret == NSFileHandlingPanelOKButton) {
    [data writeToURL:[panel URL] atomically:YES];
}

反序列化：

NSData       *data = [NSData dataWithContentsOfURL:urlOfFile];
NSDictionary *dict = [NSPropertyListSerialization propertyListFromData:data
                       mutabilityOption:NSPropertyListImmutable
                       format:nil errorDescription:nil];
NSString *string1 = [dict objectForKey:@"Field1"];
// ... etc.

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