update readme and WRNavigationBar

Author: wangrui460

README.md

@@ -67,6 +67,9 @@ More infomation please view code.
 - **2017.05.21**
 解决问题：解决push导航栏没有渐变动画太突兀的问题
 
+- **2017.06.15**
+解决问题：解决scrollView正在滑动的时候，点击返回按钮，导航栏颜色变化突兀的问题
+
 
 ## 5️⃣. 待完成功能
 

WRNavigationBar/WRNavigationBar.swift

@@ -196,8 +196,10 @@ extension UINavigationController
     func wr_popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]?
     {
         var displayLink:CADisplayLink? = CADisplayLink(target: self, selector: #selector(popNeedDisplay))
-        displayLink?.add(to: RunLoop.main, forMode: .defaultRunLoopMode)
-        CATransaction.setCompletionBlock { 
+        // UITrackingRunLoopMode: 界面跟踪 Mode，用于 ScrollView 追踪触摸滑动，保证界面滑动时不受其他 Mode 影响
+        // NSRunLoopCommonModes contains kCFRunLoopDefaultMode and UITrackingRunLoopMode
+        displayLink?.add(to: RunLoop.main, forMode: .commonModes)
+        CATransaction.setCompletionBlock {
             displayLink?.invalidate()
             displayLink = nil
             popProperties.displayCount = 0
@@ -213,7 +215,7 @@ extension UINavigationController
     func wr_popToRootViewControllerAnimated(_ animated: Bool) -> [UIViewController]?
     {
         var displayLink:CADisplayLink? = CADisplayLink(target: self, selector: #selector(popNeedDisplay))
-        displayLink?.add(to: RunLoop.main, forMode: .defaultRunLoopMode)
+        displayLink?.add(to: RunLoop.main, forMode: .commonModes)
         CATransaction.setCompletionBlock {
             displayLink?.invalidate()
             displayLink = nil
@@ -229,6 +231,7 @@ extension UINavigationController
     // change navigationBar barTintColor smooth before pop to current VC finished
     func popNeedDisplay()
     {
+        print("popNeedDisplay")
         guard let topViewController = topViewController,
             let coordinator       = topViewController.transitionCoordinator else {
                 return