writeToFile在模拟器上工作，而在使用iOS Swift的设备上不工作

Question

    if let filepath = NSBundle.mainBundle().pathForResource(“abc”, ofType: "txt")

    {
        var test_string=“abcd”
        let fileContent:NSData= test_string.dataUsingEncoding(NSUTF8StringEncoding)!
        fileContent.writeToFile(filepath, atomically: true)
        let contents = try NSString(contentsOfFile: filepath, usedEncoding: nil) as String
        print("file content  :  "+contents)
    }
    catch
    {
        self.view.makeToast("write to file error")
    }

Answer 1

Check Read and write data from text file .

I think your problem is the path, because a simulator folder can be any where but for device no, it is better to save the file inside the folder of your apps itself.

And if you are writing text, you can just write try test_string.writeToFile(path, atomically: false, encoding: NSUTF8StringEncoding)