objective-c - Objective-C - 创建文本文件以在 Cocoa 中逐行读写

Question

我构建一个 Mac 应用程序，我有 2 个问题:

1. I want to create a text file to read and write data on it. I don't know how to crate a text file to read and write data. Is it use struct?
2. I want to create a XML file to read and write data on it. Can I create a struct for XML?

你有什么建议吗？提前致谢

Answer 1

好吧，要创建一个文件，只需使用

[[NSFileManager defaultManager] createFileAtPath:@"Your/Path" contents:nil attributes:nil];

这将创建一个空文件，您可以写入或读取该文件。要写入文本(或 XML)，只需使用 NSString 的 writeToFile:atomically:encoding:error: 方法，如下所示

NSString *str = //Your text or XML
[str writeToFile:"Your/Path" atomically:YES encoding:NSUTF8StringEncoding error:nil];

要从一个文件中读取，只需要用那个文件的内容创建一个NSString

NSString *contents = [NSString stringWithContentsOfFile:@"Your/Path"];

或者，如果它不包含字符串，则从文件中获取一个 NSData 对象

NSData *contents = [NSData dataWithContentsOfFile:@"Your/Path"];