在 iPhone 中读取和写入文件

Question

如何在iPhone上进行文件读写操作？我需要指定哪个路径来保存文件？如何获取 iPhone 中当前的工作目录？

谢谢

Answer 1

写入文件：

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

// the path to write file
NSString *myFile = [documentsDirectory stringByAppendingPathComponent:@"myFile"];

[data writeToFile:myFile atomically:YES];

读取文件：

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"MyFile" ofType:@"txt"];  
NSData *myData = [NSData dataWithContentsOfFile:filePath];  
if (myData) {  
    // do something useful  
}