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| // https://swift.gg/2019/10/18/swift5-stringinterpolation-part2/
struct AttrString {
let attributedString: NSAttributedString
}
extension AttrString: ExpressibleByStringLiteral {
init(stringLiteral: String) {
self.attributedString = NSAttributedString(string: stringLiteral)
}
}
extension AttrString: CustomStringConvertible {
var description: String {
return String(describing: self.attributedString)
}
}
extension AttrString: ExpressibleByStringInterpolation {
init(stringInterpolation: StringInterpolation) {
self.attributedString = NSAttributedString(attributedString: stringInterpolation.attributedString)
}
struct StringInterpolation: StringInterpolationProtocol {
var attributedString: NSMutableAttributedString
init(literalCapacity: Int, interpolationCount: Int) {
self.attributedString = NSMutableAttributedString()
}
func appendLiteral(_ literal: String) {
let astr = NSAttributedString(string: literal)
self.attributedString.append(astr)
}
func appendInterpolation(_ string: String, attributes: [NSAttributedString.Key: Any]) {
let astr = NSAttributedString(string: string, attributes: attributes)
self.attributedString.append(astr)
}
}
}
extension AttrString {
struct Style {
let attributes: [NSAttributedString.Key: Any]
static func font(_ font: UIFont) -> Style {
return Style(attributes: [.font: font])
}
static func color(_ color: UIColor) -> Style {
return Style(attributes: [.foregroundColor: color])
}
static func bgColor(_ color: UIColor) -> Style {
return Style(attributes: [.backgroundColor: color])
}
static func link(_ link: String) -> Style {
return .link(URL(string: link)!)
}
static func link(_ link: URL) -> Style {
return Style(attributes: [.link: link])
}
static let oblique = Style(attributes: [.obliqueness: 0.1])
static func underline(_ color: UIColor, _ style: NSUnderlineStyle) -> Style {
return Style(attributes: [
.underlineColor: color,
.underlineStyle: style.rawValue
])
}
static func alignment(_ alignment: NSTextAlignment) -> Style {
let ps = NSMutableParagraphStyle()
ps.alignment = alignment
return Style(attributes: [.paragraphStyle: ps])
}
}
}
extension AttrString.StringInterpolation {
func appendInterpolation(_ string: String, _ style: AttrString.Style...) {
var attrs: [NSAttributedString.Key: Any] = [:]
style.forEach { attrs.merge($0.attributes, uniquingKeysWith: {$1}) }
let astr = NSAttributedString(string: string, attributes: attrs)
self.attributedString.append(astr)
}
}
extension AttrString.StringInterpolation {
func appendInterpolation(image: UIImage, scale: CGFloat = 1.0) {
let attachment = NSTextAttachment()
if let cgImage = image.cgImage {
attachment.image = UIImage(cgImage: cgImage, scale: scale, orientation: .left)
self.attributedString.append(NSAttributedString(attachment: attachment))
}
}
}
extension AttrString.StringInterpolation {
func appendInterpolation(wrap string: AttrString, _ style: AttrString.Style...) {
var attrs: [NSAttributedString.Key: Any] = [:]
style.forEach { attrs.merge($0.attributes, uniquingKeysWith: {$1}) }
let mas = NSMutableAttributedString(attributedString: string.attributedString)
let fullRange = NSRange(mas.string.startIndex..<mas.string.endIndex, in: mas.string)
mas.addAttributes(attrs, range: fullRange)
self.attributedString.append(mas)
}
}
|
