insert a String inside another String

Question

How can I make this:

var originalString = "http://name.domain.com/image.jpg"

becomes this:

originalString = "http://name.domain.com/image_new.jpg"

I could not find any document about the new Range<String.Index> in Swift.
This is not a problem in Obj-C, but without any reference about Range, it suddenly becomes so confusing.

Thanks.

Edit: Well, thanks for these solutions. However, let me give you more details about this question.
After uploading an image to server, it responds back with a String link, like above, and the image name is a random string.
The server also generates different versions of uploaded image (like Flickr). In order to get these images, I have to append a suffix into image name, it looks like this:

originalString = "http://image.domain.com/randomName_large.jpg" or "http://image.domain.com/randomName_medium.jpg"

So that's why I need to insert a String into another String. My solution is find the first . by scan the link backwardly and append a suffix before it, but the new Range<String.Index> makes it confusing.

Thomas Müller · Accepted Answer · 2014-12-09 01:50:53Z

2

There are some nice and useful methods on NSString that you should be able to use:

let originalString: NSString = "http://name.domain.com/image.jpg"

let extension = originalString.pathExtension // "jpg"
let withoutExt = originalString.stringByDeletingPathExtension() // "http://name.domain.com/image"
let imageName = withoutExt.lastPathComponent // "image"
let withoutFilename = withoutExt.stringByDeletingLastPathComponent() // "http://name.domain.com/"

let newString = withoutFilename
  .stringByAppendingPathComponent("\(imageName)_new")
  .stringByAppendingPathExtension(extension)

I only typed this into the browser (it's untested) but it should give you an idea...

answered Dec 9, 2014 at 1:50

Thomas Müller

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Martin R · Accepted Answer · 2014-12-08 12:13:03Z

0

This can be done with String manipulation functions. But what if the string is

var originalString = "http://images.domain.com/image.jpg"

? You probably do not want to replace the first or all occurrences of the string "image" here.

A better tool for this purpose might be NSURLComponents, which lets you modify all components of a URL separately:

var originalString = "http://name.domain.com/image.jpg"
let urlComps = NSURLComponents(string: originalString)!
urlComps.path = "/image_new.jpg"
originalString = urlComps.URL!.absoluteString!

println(originalString) // http://name.domain.com/image_new.jpg

answered Dec 8, 2014 at 12:13

Martin R

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NSMutableString · Accepted Answer · 2014-12-08 12:18:39Z

0

Why not using string interpolation?

var imageName = "image_new"
originalString = "http://images.domain.com/\(imageName).jpg"

answered Dec 8, 2014 at 12:18

NSMutableString

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1 Comment

Pham Hoan Over a year ago

Because I don't have the image name. It's responded back from server. Please check my updated question.

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