iOS沙盒（sandbox）

        // 获取目录
        // Mac 用户根目录 /Users/cloudwalk
        // iOS /Users/cloudwalk/Library/Developer/CoreSimulator/Devices/6B973E5D-1F17-488E-BCF5-BC6C3456B220/data/Containers/Data/Application/E1E7C33A-B603-46CE-B2DC-C8F578A698F0
       
        //  沙盒根目录
        NSString *sandboxPath = NSHomeDirectory();
        NSLog(@"sandboxPath = %@",sandboxPath);
        // Documents 路径
        //
        // NSSearchPathForDirectoriesInDomains 返回绝对路径
        // NSDocumentationDirectory 表示获取沙盒的Document目录
        
        /*
         Mac  获取的"/Users/cloudwalk/Library/Documentation"
         iOS  获取的"/Users/cloudwalk/Library/Developer/CoreSimulator/Devices/6B973E5D-1F17-488E-BCF5-BC6C3456B220/data/Containers/Data/Application/E8511606-E87E-4A69-9924-EC0C0549DC09/Library/Documentation"
         */
        NSArray *paths =  NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
        NSLog(@"%@",paths);
        
        NSString *documentPath = [paths lastObject];
        NSLog(@"paths = %@",documentPath )