沙盒、文件以及文件夹的操作

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];