在iOS中创建公共的.json或.txt文件？

Question

我想创建一个.json文件和.text文件public，以便NSItemProvider可以读取它。我想以编程方式创建文件。

Answer 1

您能否参考此链接，这将有助于玩文件创建，删除等...

http://www.ios-developer.net/iphone-ipad-programmer/development/file-saving-and-loading/using-the-document-directory-to-store-files

Answer 2

使用以下代码在应用的Documents目录中编写/创建 .txt 文件：

let lastName:String? = self.userDict.objectForKey("last_name")
self.lblLastName.text = "Last Name: " + lastName?   //--ERROR: Value of optional type 'String?' not unwrapped; did you mean to use '!' or '?'?

读取/获取文本文件：

NSError *error;
NSString *stringToWrite = @"hello>!!new file created..";
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent:@"myfile.txt"];
[stringToWrite writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];