CODEWITHSUNDEEP
iosswift
Stella
Stella

Reputation: 1866

Comparing 2 strings fails in Swift

I am seeing a strange issue. I am trying to compare 2 strings in Swift. One string is from the response I got from server. In the below code, it is printing as "Error" in outputString NSLog properly. But, when I do sting comparison in the next below line, it fails, it doesn't throw the error alert there. I don't know what i'm doing wrong here.

    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {(response, data, error) in
    var outputString:NSString = NSString(data:data, encoding:NSUTF8StringEncoding)!
    NSLog("outputString: %@", outputString)
    if (outputString=="Error") {
      NSLog("Error")
    }
}

Upvotes: 1

Views: 2752

Answers (2)

Daniel
Daniel

Reputation: 1057

I ran into a similar issue and the reason was a wrong encoding. I used UTF8 encoding, but the string I was comparing to was encoded with UTF16 

String(data: model, encoding: .utf16) == String(data: data, encoding: .utf18)

is false

Upvotes: 3

lchamp
lchamp

Reputation: 6612

NSString Class Reference : http://goo.gl/rPwMUx

Swift Library Reference - String : http://goo.gl/591Ebo

The two are different. So you won't be able to apply certain operation on one or the other.

In order to compare two String you can do outputString == "Error" because the comparison operators exists.

However, in order to compare two NSString you need to use the isEqualToString: method. In your case, it should work like so : outputString.isEqualToString("Error").

Edit 1 :

Code examples here : http://swiftstub.com/445434073/

Edit 2 :

You can also compare String with a NSString with the == operator.

Upvotes: 1

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