Measure friend request view height dynamically

Signal/src/Loki/FriendRequestView.swift

@@ -4,6 +4,9 @@
     @objc weak var delegate: FriendRequestViewDelegate?
     
     // MARK: Components
+    private lazy var buttonFont = UIFont.ows_dynamicTypeBodyClamped.ows_mediumWeight()
+    private lazy var buttonHeight = buttonFont.pointSize * 48 / 17
+    
     private lazy var label: UILabel = {
         let result = UILabel()
         result.textColor = Theme.secondaryColor
@@ -34,8 +37,6 @@
         buttonStackView.axis = .horizontal
         buttonStackView.distribution = .fillEqually
         mainStackView.addArrangedSubview(buttonStackView)
-        let buttonFont = UIFont.ows_dynamicTypeBodyClamped.ows_mediumWeight()
-        let buttonHeight = buttonFont.pointSize * 48 / 17
         let acceptButton = OWSFlatButton.button(title: NSLocalizedString("Accept", comment: ""), font: buttonFont, titleColor: .ows_materialBlue, backgroundColor: .white, target: self, selector: #selector(accept))
         acceptButton.autoSetDimension(.height, toSize: buttonHeight)
         buttonStackView.addArrangedSubview(acceptButton)
@@ -60,4 +61,16 @@
     @objc private func decline() {
         delegate?.declineFriendRequest(message)
     }
+    
+    // MARK: Measuring
+    @objc static func calculateHeight(message: TSIncomingMessage, conversationStyle: ConversationStyle) -> CGFloat {
+        let width = conversationStyle.contentWidth
+        let topSpacing: CGFloat = 12
+        let dummyFriendRequestView = FriendRequestView()
+        dummyFriendRequestView.message = message
+        let messageHeight = dummyFriendRequestView.label.sizeThatFits(CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)).height
+        let buttonHeight = dummyFriendRequestView.buttonHeight
+        let totalHeight = topSpacing + messageHeight + buttonHeight
+        return totalHeight.rounded(.up)
+    }
 }

Signal/src/ViewControllers/ConversationView/Cells/OWSMessageCell.m

@@ -371,7 +371,7 @@ NS_ASSUME_NONNULL_BEGIN
     }
 
     if (self.isIncomingFriendRequest) {
-        cellSize.height += 98; // TODO: Measure dynamically
+        cellSize.height += [FriendRequestView calculateHeightWithMessage:(TSIncomingMessage *)self.viewItem.interaction conversationStyle:self.conversationStyle];
     }
     
     cellSize = CGSizeCeil(cellSize);