I am trying to draw boxes around each digit entered by a user in
UITextField for which keyboard type is - Number Pad.
To simplify the problem statement I assumed that each of the digits (0 to
9) will have same bounding box for its glyph, which I obtained using below
code:
func getGlyphBoundingRect() -> CGRect? {
guard let font = font else {
return nil
}
// As of now taking 8 as base digit
var unichars = [UniChar]("8".utf16)
var glyphs = [CGGlyph](repeating: 0, count: unichars.count)
let gotGlyphs = CTFontGetGlyphsForCharacters(font, &unichars,
&glyphs, unichars.count)
if gotGlyphs {
let cgpath = CTFontCreatePathForGlyph(font, glyphs[0], nil)!
let path = UIBezierPath(cgPath: cgpath)
return path.cgPath.boundingBoxOfPath
}
return nil
}
I am drawing each bounding box thus obtained using below code:
func configure() {
guard let boundingRect = getGlyphBoundingRect() else {
return
}
for i in 0..<length { // length denotes number of allowed digits in
the box
var box = boundingRect
box.origin.x = (CGFloat(i) * boundingRect.width)
let shapeLayer = CAShapeLayer()
shapeLayer.frame = box
shapeLayer.borderWidth = 1.0
shapeLayer.borderColor = UIColor.orange.cgColor
layer.addSublayer(shapeLayer)
}
}
Now problem is - if I am entering digits - 8,8,8 in the text field then
for first occurrence of digit the bounding box drawn is aligned, however
for second occurrence of same digit the bounding box appears a bit offset
(by negative x), the offset value (in negative x) increases for subsequent
occurrences of same digit.
I tried to solve the problem by setting NSAttributedString.Key.kern to 0,
however it did not change the behavior.
Am I missing any important property in X axis from the calculation due to
which I am unable to get properly aligned bounding box over each digit?
Please suggest.
--
Thanks,
Devarshi
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