Swift round up for respondsToSelector() and sizeWithFont() - ios

Question

I am translating the following Objective-C code into Swift:
- (void)layoutSubviews
{
CGSize valueLabelSize = CGSizeZero;
if ([self.valueLabel.text respondsToSelector:#selector(sizeWithAttributes:)])
{
valueLabelSize = [self.valueLabel.text sizeWithAttributes:#{NSFontAttributeName:self.valueLabel.font}];
}
else
{
valueLabelSize = [self.valueLabel.text sizeWithFont:self.valueLabel.font];
}
CGFloat xOffset = ceil((self.bounds.size.width - valueLabelSize.width) * 0.5);
self.valueLabel.frame = CGRectMake(xOffset, ceil(self.bounds.size.height * 0.5) - ceil(valueLabelSize.height * 0.5), valueLabelSize.width, valueLabelSize.height);
}
This code basically loads dynamically an UILabel in the middle of the UIView respecting the relative font size and the padding of the view. This is the code I currently have:
override func layoutSubviews()
{
var valueSize = CGSizeZero
if valueLabel.text != nil {
if ((self.valueLabel.text! as NSString).respondsToSelector(Selector("sizeWithAttributes:"))){
valueSize = (self.valueLabel.text! as NSString).sizeWithAttributes([NSFontAttributeName:self.valueLabel.font])
}
}
let xOffSet = ceil((self.bounds.size.width - valueSize.width) * 0.5)
valueLabel.frame = CGRectMake(xOffSet, ceil(self.bounds.size.height * 0.5) - ceil(valueSize.height * 0.5), valueSize.width, valueSize.height)
}
This is not working correctly cause the label appears in the left-top corner of the view. I believe there is some round up in swift for not using the respondsToSelector() method but do not know how. I also want to avoid using sizeWithFont() cause it's deprecated.
Any help will be very welcomed!

Answer 1

I finally made it work using the superview property:
override func layoutSubviews() {
super.layoutSubviews()
var valueSize = CGSizeZero
if let textValue = valueLabel.text {
valueSize = textValue.sizeWithAttributes([NSFontAttributeName:self.valueLabel.font])
}
var unitSize = CGSizeZero
if let textUnit = unitLabel.text {
unitSize = textUnit.sizeWithAttributes([NSFontAttributeName:self.unitLabel.font])
}
let xOffset = ceil((superview!.bounds.size.width - (valueSize.width + unitSize.width)) * 0.5)
valueLabel.frame = CGRectMake(xOffset, ceil(superview!.bounds.size.height * 0.5) - ceil(valueSize.height * 0.5), valueSize.width, valueSize.height)
unitLabel.frame = CGRectMake(CGRectGetMaxX(valueLabel.frame), ceil(superview!.bounds.size.height * 0.5) - ceil(unitSize.height * 0.5) + iMinistryValueInformationViewPadding, unitSize.width, unitSize.height)
}
Thanks anyway for the help!

Answer 2

Have you tried using label.sizeToFit() to set the correct label size to fit your content?
For example:
class CustomView : UIView {
lazy var textLabel: UILabel = {
let label = UILabel()
// Setup your label's text attributes here.
// e.g. font size
self.addSubview(label)
return label
}()
override func layoutSubviews() {
super.layoutSubviews()
// By this point the `text` for the label and all attributes
// that could affect the text size need to be set.
textLabel.sizeToFit()
textLabel.center = CGPoint(x: frame.width / 2, y: frame.height / 2)
}
}
The result:
Hope that helps!