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iOS

Posted by Andrés Leal
Andrés Leal
9,563 Points

For what is this <> used in swift?

Can someone explain me how to use this: "<>", I have seen this around <UInt8> but I can't understand.

Alireza Rafiei
Alireza Rafiei
4,221 Points

Provide an example.

Andrés Leal
Andrés Leal
9,563 Points

func getPixelColor(pos: CGPoint) -> UIColor {

      var pixelData = CGDataProviderCopyData(CGImageGetDataProvider(self.CGImage))
      var data: UnsafePointer<UInt8> = CFDataGetBytePtr(pixelData)

      var pixelInfo: Int = ((Int(self.size.width) * Int(pos.y)) + Int(pos.x)) * 4

      var r = CGFloat(data[pixelInfo]) / CGFloat(255.0)
      var g = CGFloat(data[pixelInfo+1]) / CGFloat(255.0)
      var b = CGFloat(data[pixelInfo+2]) / CGFloat(255.0)
      var a = CGFloat(data[pixelInfo+3]) / CGFloat(255.0)

      return UIColor(red: r, green: g, blue: b, alpha: a)
  }
Alireza Rafiei
Alireza Rafiei
4,221 Points

The only time this symbol is used in Swift is in protocol composition type:

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Types.html#//apple_ref/doc/uid/TP40014097-CH31-ID446

Watch Swift protocol lectures, I'm not there yet myself!

Andrés Leal
Andrés Leal
9,563 Points

Thank you, that really help! :D