From 1dea74b99b9b88d4a2292863d857768606a309c4 Mon Sep 17 00:00:00 2001
From: iWw <i.1214@yahoo.com>
Date: Thu, 1 Dec 2022 16:39:58 +0800
Subject: [PATCH] Add fade effect when intro change

---
 Sources/Marker/Marker+Draw.swift | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/Sources/Marker/Marker+Draw.swift b/Sources/Marker/Marker+Draw.swift
index 42f40da..926033c 100644
--- a/Sources/Marker/Marker+Draw.swift
+++ b/Sources/Marker/Marker+Draw.swift
@@ -27,14 +27,23 @@ extension Marker {
     }
     
     internal func setupIntro(calculate: Calculate) {
-        if let introString = current.intro as? String {
-            contentLabel.text = introString
-        } else if let attributedString = current.intro as? NSAttributedString {
-            contentLabel.attributedText = attributedString
+        // make content change has a fade effect
+        contentLabel.layer.removeAnimation(forKey: "marker-fade-animation")
+        let transition = CATransition()
+        transition.timingFunction = CAMediaTimingFunction(name: .easeOut)
+        transition.type = .fade
+        transition.duration = animateDuration
+        contentLabel.layer.add(transition, forKey: "marker-fade-animation")
+        
+        // change content
+        if let introString = calculate.info.intro as? String {
+            self.contentLabel.text = introString
+        } else if let attributedString = calculate.info.intro as? NSAttributedString {
+            self.contentLabel.attributedText = attributedString
         } else {
-            contentLabel.text = "Can not support this type: \(type(of: current.intro))"
+            self.contentLabel.text = "Can not support this type: \(type(of: calculate.info.intro))"
         }
-        contentLabel.frame.size = calculate.calculateContentSize(label: contentLabel)
+        self.contentLabel.frame.size = calculate.calculateContentSize(label: self.contentLabel)
     }
     
     internal func setupDimmingView(calculate: Calculate) {