IOS基础知识记录六(读写文件)

ios对文件的读写

NSString *filePath = @"/User/test.txt"//判断文件是否存在, 否则创建该文件if (![[NSFileManager alloc] fileExistsAtPath: filePath]) {        //contents 可以初始化文件时, 加入默认内容        [[NSFileManager alloc] createFileAtPath: filePath                                       contents: nil attributes: nil];    }//更新文件NSFileHandle *handler = [NSFileHandle fileHandleForUpdatingAtPath: filePath];    [handler seekToEndOfFile];//跳到文件末尾        NSString *content = @"this is a file."     [handler writeData: [content dataUsingEncoding: NSUTF8StringEncoding]];    [handler closeFile];

//读取文件  if ([[NSFileManager alloc] fileExistsAtPath: filePath]) {        NSFileHandle *handler = [NSFileHandle fileHandleForReadingAtPath: filePath];               //content读取的新内容        NSString *content = [[NSString alloc] initWithData: [handler availableData] encoding: NSUTF8StringEncoding];                [handler closeFile];    }

[handler closeFile];//文件读写后，关闭文件