I am creating a custom graphical keyboard and I am having problems resizing the image correctly. I tried a bunch of different methods without success. The problem is that the image is larger than I would like, or if I resize it to half my estimated size, then it will be more blurry than the original. In the following example, I am trying to resize an image to the same size (see the bottom of the message for a screenshot) because it is displayed on the screen. Here is my code to call resize:
println("Starting Size is \(image!.size)")
println("New Size is: \(sender.frame.size))")
println("Initial Scale: \(image!.scale)")
image = imageResize(image!, size: CGSize(width: sender.frame.width, height: sender.frame.height))
println("Final Size is \(image!.size)")
println("Final Scale: \(image!.scale)")
Here is the console output for the above print statements:
Starting Size is (750.0, 750.0)
New Size is: (78.0, 78.0))
Initial Scale: 1.0
Final Size is (78.0, 78.0)
Final Scale: 2.0
Here is the function imageResize
func imageResize(image:UIImage, size:CGSize)-> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0)
var context = UIGraphicsGetCurrentContext()
CGContextSetInterpolationQuality(context, kCGInterpolationHigh)
image.drawInRect(CGRect(origin: CGPointZero, size: size))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return scaledImage
}
Finally, here is a screenshot:
Update:
, - . UIButton (750x750), . , , UIButton . .
# 2
, :
func imageResize(image:UIImage, size:CGSize)-> UIImage {
let scale = UIScreen.mainScreen().scale
let newSize = CGSize(width: size.width / scale, height: size.height / scale)
UIGraphicsBeginImageContextWithOptions(newSize, false, scale)
var context = UIGraphicsGetCurrentContext()
CGContextSetInterpolationQuality(context, kCGInterpolationHigh)
image.drawInRect(CGRect(origin: CGPointZero, size: newSize))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return scaledImage
}
:
Starting Size is (750.0, 750.0)
New Size is: (78.0, 78.0))
Initial Scale: 1.0
Final Size is (39.0, 39.0)
Final Scale: 2.0
, (iPhone 6):
, , UIButton . , UIButton, . , ?
# 3
, , .
let newSize = CGSize(width: size.width * scale, height: size.height * scale)
:
Starting Size is (750.0, 750.0)
New Size is: (78.0, 78.0))
Initial Scale: 1.0
Final Size is (156.0, 156.0)
Final Scale: 2.0
, , , . , , , , UIButton . , , , . :
pb.setData(UIImagePNGRepresentation(image), forPasteboardType: type)