StringByAppendingPathComponent() and WriteToFile()

Question

I'm trying to learn Swift 3 with translating a code from Swift 2. In swift 2, I see the code like this:

return fullPath.stringByAppendingPathComponent(name)

But, when I try in Swift 3, I've got similiar code, but like this:

return fullPath.strings(byAppendingPaths: [name])

The issue is, return type in the 1st code is String (and that's the output I need from the lesson I learn), but return type in 2nd code should be [String].

The other issue is, in Swift 2 the code should be:

imgData?.WriteToFile(fullPath, atomicaly:Bool)

But in Swift 3, I only can input code like this:

imgData.Write(to: URL , option: WritingOption) throws

But in some examples, there's .Write(toFile: , atomically:) but I can't find it in Xcode.

Am I translating incorrectly or using both Swift 2 and Swift 3 incorrectly?

Answer 1

Regarding the first part of your question , as dan stated in the comments you should be using fullPath.appendingPathComponent(name) instead.

Regarding your second question:

The main difference between writeToFile and write(to: is the fact that the first is for String s and the seconds is for NSData .

Somewhat related:

According to the NSData Class Reference

In iOS 2.0+ you have:

write(to:atomically:)

and

write(toFile:atomically:)

Given:

Since at present only file:// URLs are supported, there is no difference between this method and writeToFile:atomically:, except for the type of the first argument.

None of this has changed in Swift 3 according to the Swift Changelog .