Merge pull request #1819 from RomanPodymov/master

Fix #816

CHANGELOG.md

@@ -335,6 +335,11 @@ Version 4.0.0 comes with couple of breaking changes, please refer to [MIGRATION_
 
 ## [2.0.0-beta.1](https://github.com/MessageKit/MessageKit/releases/tag/2.0.0-beta.1)
 
+### Fixed
+
+- Fixed `boundingRect(with:options:)` miscalculation of `MessageLabel` by using `NSLayoutManager`, like text `Ꮚ˘̴͈́ꈊ˘̴͈̀Ꮚ⋆✩`、`Tomorrow is the day`.
+[#824](https://github.com/MessageKit/MessageKit/pull/824) by [@zhongwuzw](https://github.com/zhongwuzw).
+
 ### Changed
 
 - **Breaking Change** Updated codebase to Swift 4.2 [#883](https://github.com/MessageKit/MessageKit/pull/883) by [@nathantannar4](https://github.com/nathantannar4)

Sources/Layout/MessageSizeCalculator.swift

@@ -316,15 +316,33 @@ open class MessageSizeCalculator: CellSizeCalculator {
   }
 
   // MARK: Internal
+  internal lazy var textContainer: NSTextContainer = {
+    let textContainer = NSTextContainer()
+    textContainer.maximumNumberOfLines = 0
+    textContainer.lineFragmentPadding = 0
+    return textContainer
+  }()
+  internal lazy var layoutManager: NSLayoutManager = {
+    let layoutManager = NSLayoutManager()
+    layoutManager.addTextContainer(textContainer)
+    return layoutManager
+  }()
+  internal lazy var textStorage: NSTextStorage = {
+    let textStorage = NSTextStorage()
+    textStorage.addLayoutManager(layoutManager)
+    return textStorage
+  }()
 
   internal func labelSize(for attributedText: NSAttributedString, considering maxWidth: CGFloat) -> CGSize {
     let constraintBox = CGSize(width: maxWidth, height: .greatestFiniteMagnitude)
-    let rect = attributedText.boundingRect(
-      with: constraintBox,
-      options: [.usesLineFragmentOrigin, .usesFontLeading],
-      context: nil).integral
 
-    return rect.size
+    textContainer.size = constraintBox
+    textStorage.replaceCharacters(in: NSRange(location: 0, length: textStorage.length), with: attributedText)
+    layoutManager.ensureLayout(for: textContainer)
+
+    let size = layoutManager.usedRect(for: textContainer).size
+
+    return CGSize(width: size.width.rounded(.up), height: size.height.rounded(.up))
   }
 }
 

Sources/Views/MessageLabel.swift

@@ -130,7 +130,7 @@ open class MessageLabel: UILabel {
 
   open override func drawText(in rect: CGRect) {
     let insetRect = rect.inset(by: textInsets)
-    textContainer.size = CGSize(width: insetRect.width, height: rect.height)
+    textContainer.size = CGSize(width: insetRect.width, height: insetRect.height)
 
     let origin = insetRect.origin
     let range = layoutManager.glyphRange(for: textContainer)