NSData

// 把NSString转化成NSData        NSData *dataContents = [str dataUsingEncoding:NSUTF8StringEncoding];

沙盒

//沙盒路径        //方法一（主目录文件）        NSString *sandBoxPath = NSHomeDirectory();        NSLog(@"%@", sandBoxPath);        //方法二 （iOS开发mac开发均可用）        NSArray *sandBoxPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);        //拼接方法一（拼接前加／）        NSString *path1 = [sandBoxPath stringByAppendingString:@"/Documents"];        NSLog(@"%@", path1);        //拼接方法二（不用加／）        NSString *path2 = [sandBoxPath stringByAppendingPathComponent:@"file.txt"];        [[NSFileManager defaultManager] createFileAtPath:path2 contents:nil attributes:nil];        NSLog(@"path2:%@", path2);

文件以及文件夹操作

NSFileManager *fileManeger = [NSFileManager defaultManager];        NSString *str = @"hello world";        NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];        NSString *homePath = NSHomeDirectory();        //创建文件        NSString *filePath = [homePath stringByAppendingPathComponent:@"Desktop/file.txt"];        [fileManeger createFileAtPath:filePath contents:data attributes:nil];        //文件夹的创建        NSString *dirPath = [homePath stringByAppendingPathComponent:@"/Desktop/Apel0811"];        [fileManeger createDirectoryAtPath:dirPath withIntermediateDirectories:YES                             attributes:nil                             error:nil];        //读取文件        NSData *fileData = [fileManager contentsAtPath:filePath2];        NSString ＊string ＝ [[NSString alloc] initWithData:fileData encoding:NSUTF8StringEncoding]);        //复制文件        //目标地址必须要加上文件地址        [fileManeger copyItemAtPath:srcPath toPath:dstPath  error:nil];        //剪切文件        //目标地址必须要加上文件地址        [fileManeger moveItemAtPath:srcPath toPath:dstPath error:nil];        //删除文件        [fileManeger removeItemAtPath:homePath error:nil];

文件内容操作

//写入        //写入文件内容,如果没有就会添加        NSString *str = @"hello world";        NSString *path1 = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/string.txt"];        [str writeToFile:path1 atomically:NO encoding:NSUTF8StringEncoding error:nil];        //写入NSDictionary        NSDictionary *dic = @{                              @"key1" : @"value1",                              @"key2" : @"value2",                              @"key3" : @"value3"                              };        NSString *path2 = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/dictionary.plist"];        [dic writeToFile:path2 atomically:YES];        //写入NSArray        NSArray *array = @[@1, @2, @3];        NSString *path3 = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/array.plist"];        [array writeToFile:path3 atomically:YES];        //读取        //读取文本文件        NSString *readStr = [NSString stringWithContentsOfFile:path1 encoding:NSUTF8StringEncoding error:nil];        //读取数组文件        NSArray *readArray = [NSArray arrayWithContentsOfFile:path3];        //读取字典文件        NSDictionary *readDic = [NSDictionary dictionaryWithContentsOfFile:path2];