Xcode: why does Xcode shows an image bigger then AS-IS? - ios

Question

Why does Xcode shows a image bigger then AS-IS?
http://users.telenet.be/thomazz/ScreenShot4.png
http://users.telenet.be/thomazz/ScreenShot3.png
Scenario:
I got an image.
I resize this UIImage.
I export the resized UIImage.
I comment out my resize code.
I import the resized image in Xcode.
problem 1: Xcode shows the image twice as big as normal.
problem 2: when I run my app with the exported-resized image, it is twice as big.
view screenshots.

Answer 1

This totally depends on your frame of your UIImageView and not its dimensions.
So if you have an 1024x1024 image and you place it in a 10x10 frame, it will render to 10x10 size and vice versa.
If you want it bigger, then make your UIImageView bigger
Edit: so it is a google maps icon
Set the resized image as marker icon ,i.e,
marker.icon = self.imageWithImage(image: UIImage(named: "imageName")!, scaledToSize: CGSize(width: 3.0, height: 3.0))
Add this function
func imageWithImage(image:UIImage, scaledToSize newSize:CGSize) -> UIImage{
UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0);
image.drawInRect(CGRectMake(0, 0, newSize.width, newSize.height))
let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}

Answer 2

Dear Mohammad Bashir Sidani, I have this code.
And this code works. but it creates a new UIImage.
Then I use UIImagePNGRepresentation(resizedImage) to export the image.
I disable the code below to use the "programmatically-resized image".
this new resized image is blown up by Xcode... :(
extension UIImage {
func resizeImage(_ dimension: CGFloat, opaque: Bool, contentMode: UIViewContentMode = .scaleAspectFit) -> UIImage {
var width: CGFloat
var height: CGFloat
var newImage: UIImage
let size = self.size
let aspectRatio = size.width/size.height
switch contentMode {
case .scaleAspectFit:
if aspectRatio > 1 { // Landscape image
width = dimension
height = dimension / aspectRatio
} else { // Portrait image
height = dimension
width = dimension * aspectRatio
}
default:
fatalError("UIIMage.resizeToFit(): FATAL: Unimplemented ContentMode")
}
if #available(iOS 10.0, *) {
let renderFormat = UIGraphicsImageRendererFormat.default()
renderFormat.opaque = opaque
let renderer = UIGraphicsImageRenderer(size: CGSize(width: width, height: height), format: renderFormat)
newImage = renderer.image {
(context) in
self.draw(in: CGRect(x: 0, y: 0, width: width, height: height))
}
} else {
UIGraphicsBeginImageContextWithOptions(CGSize(width: width, height: height), opaque, 0)
self.draw(in: CGRect(x: 0, y: 0, width: width, height: height))
newImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
}
return newImage
}
}