Swift Playground

Playground.swift

import UIKit
 
// Line Height ----------------------------------------
 
let label = UILabel(frame: CGRectMake(0, 0, 300, 100))
label.numberOfLines = 0
label.text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."
 
label // Raw
 
let lineHeightMultiple: CGFloat = 1.5
 
let attributedString = label.attributedText.mutableCopy() as NSMutableAttributedString
 
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = lineHeightMultiple;
 
attributedString.addAttribute(
    NSParagraphStyleAttributeName,
    value: paragraphStyle,
    range: NSMakeRange(0, attributedString.length))
 
label.attributedText = attributedString
 
label // Output
 
// Partial Corner Radius ----------------------------------------
 
let view = UIView(frame: CGRectMake(0, 0, 100, 30))
view.backgroundColor = UIColor.orangeColor()
 
view // Raw
 
let cornerRadius: CGFloat = 4.0
let corners = UIRectCorner.TopLeft | UIRectCorner.TopRight
 
view.layoutIfNeeded()
 
let maskPath = UIBezierPath(
    roundedRect: view.bounds,
    byRoundingCorners: corners,
    cornerRadii: CGSizeMake(cornerRadius, cornerRadius))
 
let maskLayer = CAShapeLayer()
maskLayer.frame = view.bounds
maskLayer.path = maskPath.CGPath
 
view.layer.mask = maskLayer
 
view // Output