My scrollView cut my last picture Swift 3 - ios

Question

I have an horizontal scrollView, where I add my array of image, but it alway cut the picture, my content mode is scaleToFill. I printed the size of my imageView and my scrollView and gave me the same size, so why can't I see my picture filling all my scrollView
My first Image and
My last image of my array
Here is my code
func getFavoriteSalon()
{
arrayOfDataScrollView = [#imageLiteral(resourceName: "large"), #imageLiteral(resourceName: "Kristoff-image-kristoff-36081750-500-266"), #imageLiteral(resourceName: "image-battle-for-dream-island-39780938-500-266")]
mainScrollView.contentSize.width = (mainScrollView.frame.width) * CGFloat(arrayOfDataScrollView.count)
for i in 0..<arrayOfDataScrollView.count
{
let imageView = UIImageView()
let xPosition = self.mainScrollView.frame.width * CGFloat(i)
imageView.frame = CGRect(x: xPosition, y: 0, width: self.mainScrollView.frame.width , height: self.mainScrollView.frame.height)
imageView.image = arrayOfDataScrollView[i]
imageView.contentMode = .scaleToFill
print(self.mainScrollView.frame.width) =>Give me 375
print(self.mainScrollView.frame.height) =>Give me 200
print("Width => \(imageView.frame.width)") =>Give me 375
print("height => \(imageView.frame.height)") =>Give me 200
mainScrollView.addSubview(imageView)
}
}

Answer 1

I found a solution, for me it's a bug xcode, i work with an emulateur of Iphone7+, but I got the value of an Iphone 7 when i print my variables, Be sure to have the preview, and the emulateur looking the same device

Answer 2

Use this and set content size according image
var xPosition:CGFloat = 0
for i in 0..<arrayOfDataScrollView.count{
var frame: CGRect = CGRect(x: 0, y: 0, width: self.mainScrollView.frame.width, height: self.mainScrollView.frame.height)
frame.origin.x = CGFloat(xPosition)
frame.size = mainScrollView.frame.size
let imageView = UIImageView(frame: frame)
imageView.contentMode = .scaleToFill
imageView.frame.size.width = imageWidth
imageView.frame.size.height = imageHeight
imageView.frame.origin.x = xPosition
imageView.frame.origin.y = 0
mainScrollView.addSubview(imageView)
xPosition += imageView.frame.size.width + 5; (5 you can change this value)
mainScrollView.contentSize = CGSize(width: CGFloat(i) * imageView.frame.size.width, height:
mainScrollView.frame.size.height)
}