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AtributedLabel cleanup and refactoring
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@psharanda
psharanda committed Oct 20, 2017
1 parent d2fc321 commit 215af89
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Showing 3 changed files with 91 additions and 64 deletions.
4 changes: 2 additions & 2 deletions Atributika.xcodeproj/project.pbxproj
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Original file line number Diff line number Diff line change
Expand Up @@ -704,7 +704,7 @@
CLANG_ENABLE_CODE_COVERAGE = NO;
CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
INFOPLIST_FILE = Demo/Info.plist;
IPHONEOS_DEPLOYMENT_TARGET = 8.0;
IPHONEOS_DEPLOYMENT_TARGET = 9.0;
LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
PRODUCT_BUNDLE_IDENTIFIER = org.psharanda.Demo;
PRODUCT_NAME = "$(TARGET_NAME)";
Expand All @@ -722,7 +722,7 @@
CLANG_ENABLE_CODE_COVERAGE = NO;
CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
INFOPLIST_FILE = Demo/Info.plist;
IPHONEOS_DEPLOYMENT_TARGET = 8.0;
IPHONEOS_DEPLOYMENT_TARGET = 9.0;
LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
PRODUCT_BUNDLE_IDENTIFIER = org.psharanda.Demo;
PRODUCT_NAME = "$(TARGET_NAME)";
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2 changes: 0 additions & 2 deletions Demo/AttributedLabelDemoViewController.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -24,8 +24,6 @@ class AttributedLabelDemoViewController: UIViewController {
super.viewDidLoad()
view.backgroundColor = .white

let label = AttributedLabel()

let all = Style.font(.systemFont(ofSize: 16))
let link = Style("a")
.foregroundColor(.blue, .normal)
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149 changes: 89 additions & 60 deletions Sources/AttributedLabel.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -10,18 +10,34 @@ import UIKit

public class AttributedLabel: UIView {

//MARK: - private properties
private let label = UILabel()
private var clickButtons = [ClickButton]()
private var detectionAreaButtons = [DetectionAreaButton]()

//MARK: - public properties
public var onClick: ((AttributedLabel, Detection)->Void)?

public var isEnabled: Bool = true {
didSet {
clickButtons.forEach { $0.isUserInteractionEnabled = isEnabled }
update()
public var isEnabled: Bool {
set {
detectionAreaButtons.forEach { $0.isUserInteractionEnabled = newValue }
state.isEnabled = newValue
}
get {
return state.isEnabled
}
}

public var attributedText: AttributedText? {
set {
state.attributedTextAndString = newValue.map { ($0, $0.attributedString) }
setNeedsLayout()
}
get {
return state.attributedTextAndString?.0
}
}

//MARK: - public properties redirected to underlying UILabel
public var font: UIFont {
set { label.font = newValue }
get { return label.font }
Expand Down Expand Up @@ -57,6 +73,7 @@ public class AttributedLabel: UIView {
get { return label.shadowOffset }
}

//MARK: - init
public override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
Expand All @@ -71,58 +88,57 @@ public class AttributedLabel: UIView {
addSubview(label)
}

public var attributedText: AttributedText? {
didSet {
label.attributedText = attributedText?.attributedString
setNeedsLayout()
}
}

//MARK: - overrides
public override func layoutSubviews() {
super.layoutSubviews()

label.frame = bounds

clickButtons.forEach {
detectionAreaButtons.forEach {
$0.removeFromSuperview()
}

clickButtons.removeAll()
detectionAreaButtons.removeAll()

if let attributedText = attributedText {
if let (text, string) = state.attributedTextAndString {

let attributedTextString = fixedAttributedText(string: attributedText.attributedString)
let inheritedString = string.withInherited(font: font, textAlignment: textAlignment)

let textContainer = NSTextContainer(size: bounds.size)
textContainer.lineBreakMode = lineBreakMode
textContainer.maximumNumberOfLines = numberOfLines
textContainer.lineFragmentPadding = 0

let textStorage = NSTextStorage(attributedString: attributedTextString)
let textStorage = NSTextStorage(attributedString: inheritedString)

let layoutManager = NSLayoutManager()
layoutManager.addTextContainer(textContainer)

textStorage.addLayoutManager(layoutManager)

let highlightableDetections = attributedText.detections.filter { $0.style.typedAttributes[.highlighted] != nil }
let highlightableDetections = text.detections.filter { $0.style.typedAttributes[.highlighted] != nil }

let usedRect = layoutManager.usedRect(for: textContainer)
let dy = max(0, (bounds.height - usedRect.height)/2)
highlightableDetections.forEach { detection in
let nsrange = NSRange(detection.range, in: attributedTextString.string)
let nsrange = NSRange(detection.range, in: inheritedString.string)
layoutManager.enumerateEnclosingRects(forGlyphRange: nsrange, withinSelectedGlyphRange: NSRange(location: NSNotFound, length: 0), in: textContainer, using: { (rect, stop) in
var finalRect = rect
finalRect.origin.y += dy
self.addClickButton(frame: finalRect, detection: detection)
self.addDetectionAreaButton(frame: finalRect, detection: detection)
})
}
}
}

private class ClickButton: UIControl {
public override func sizeThatFits(_ size: CGSize) -> CGSize {
return label.sizeThatFits(size)
}

//MARK: - DetectionAreaButton
private class DetectionAreaButton: UIControl {

var onChangeIsHighlighted: ((ClickButton)->Void)?
var onHighlightChanged: ((DetectionAreaButton)->Void)?

let detection: Detection
init(detection: Detection) {
Expand All @@ -132,7 +148,7 @@ public class AttributedLabel: UIView {

override var isHighlighted: Bool {
didSet {
onChangeIsHighlighted?(self)
onHighlightChanged?(self)
}
}

Expand All @@ -141,62 +157,75 @@ public class AttributedLabel: UIView {
}
}

private func addClickButton(frame: CGRect, detection: Detection) {
let button = ClickButton(detection: detection)
button.addTarget(self, action: #selector(handleClick), for: .touchUpInside)
clickButtons.append(button)
private func addDetectionAreaButton(frame: CGRect, detection: Detection) {
let button = DetectionAreaButton(detection: detection)
button.isUserInteractionEnabled = state.isEnabled
button.addTarget(self, action: #selector(handleDetectionAreaButtonClick), for: .touchUpInside)
detectionAreaButtons.append(button)

button.onChangeIsHighlighted = { [weak self] in
self?.update(isHighlighted: $0.isHighlighted, detection: $0.detection)
button.onHighlightChanged = { [weak self] in
self?.state.detection = $0.isHighlighted ? $0.detection : nil
}

addSubview(button)
button.frame = frame
}

private func update(isHighlighted: Bool, detection: Detection) {
if isHighlighted {
if let attributedString = attributedText?.attributedString {
let mutAttributedString = NSMutableAttributedString(attributedString: attributedString)
mutAttributedString.addAttributes(detection.style.highlightedAttributes, range: NSRange(detection.range, in: attributedString.string))
label.attributedText = mutAttributedString
}
} else {
update()
}
@objc private func handleDetectionAreaButtonClick(_ sender: DetectionAreaButton) {
onClick?(self, sender.detection)
}

private func update() {
if isEnabled {
label.attributedText = attributedText?.attributedString
} else {
label.attributedText = attributedText?.disabledAttributedString
//MARK: - state

private struct State {
var attributedTextAndString: (AttributedText, NSAttributedString)?
var isEnabled: Bool
var detection: Detection?
}

private var state: State = State(attributedTextAndString: nil, isEnabled: true, detection: nil) {
didSet {
updateLabel()
}
}

@objc private func handleClick(_ sender: ClickButton) {
onClick?(self, sender.detection)
private func updateLabel() {
if let (text, string) = state.attributedTextAndString {

if let detection = state.detection {
let higlightedAttributedString = NSMutableAttributedString(attributedString: string)
higlightedAttributedString.addAttributes(detection.style.highlightedAttributes, range: NSRange(detection.range, in: string.string))
label.attributedText = higlightedAttributedString
} else {
if state.isEnabled {
label.attributedText = string
} else {
label.attributedText = text.disabledAttributedString
}
}
} else {
label.attributedText = nil
}
}
}

extension NSAttributedString {

private func fixedAttributedText(string: NSAttributedString) -> NSAttributedString {
func withInherited(font: UIFont, textAlignment: NSTextAlignment) -> NSAttributedString {

let ps = NSMutableParagraphStyle()
ps.alignment = textAlignment
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = textAlignment

let inheritedAttributes = [NSAttributedStringKey.font: font as Any, NSAttributedStringKey.paragraphStyle: ps as Any]
let attributedTextWithFont = NSMutableAttributedString(string: string.string, attributes: inheritedAttributes)
let inheritedAttributes = [NSAttributedStringKey.font: font as Any, NSAttributedStringKey.paragraphStyle: paragraphStyle as Any]
let result = NSMutableAttributedString(string: string, attributes: inheritedAttributes)

attributedTextWithFont.beginEditing()
string.enumerateAttributes(in: NSMakeRange(0, string.length), options: .longestEffectiveRangeNotRequired, using: { (attributes, range, _) in
attributedTextWithFont.addAttributes(attributes, range: range)
result.beginEditing()
enumerateAttributes(in: NSMakeRange(0, length), options: .longestEffectiveRangeNotRequired, using: { (attributes, range, _) in
result.addAttributes(attributes, range: range)
})
attributedTextWithFont.endEditing()
result.endEditing()

return attributedTextWithFont
}

public override func sizeThatFits(_ size: CGSize) -> CGSize {
return label.sizeThatFits(size)
return result
}
}

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