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iOS Swift: How to count the width of the UILabel. And how to size UICollectionViewCell dynamically with label.
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { | |
let text = collections[indexPath.row].name | |
let width = UILabel.textWidth(font: titleFont, text: text) | |
return CGSize(width: width + left + right, height: height) | |
} |
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extension UILabel { | |
func textWidth() -> CGFloat { | |
return UILabel.textWidth(label: self) | |
} | |
class func textWidth(label: UILabel) -> CGFloat { | |
return textWidth(label: label, text: label.text!) | |
} | |
class func textWidth(label: UILabel, text: String) -> CGFloat { | |
return textWidth(font: label.font, text: text) | |
} | |
class func textWidth(font: UIFont, text: String) -> CGFloat { | |
let myText = text as NSString | |
let rect = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude) | |
let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSFontAttributeName: font], context: nil) | |
return ceil(labelSize.width) | |
} | |
} |
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