refine waver and sampleview

Yep/ViewControllers/Conversation/ConversationViewController.swift

@@ -445,6 +445,7 @@ class ConversationViewController: UIViewController {
             // 先调整一下初次的 contentInset
             setConversaitonCollectionViewOriginalContentInset()
             
+            //以前的方法不能保证边界情况滚到底部
             scrollToLastMessage()
         }
         
@@ -1173,6 +1174,7 @@ extension ConversationViewController: UICollectionViewDataSource, UICollectionVi
         super.viewDidDisappear(animated)
         FayeService.sharedManager.delegate = nil
         timer.invalidate()
+        self.waverView.removeFromSuperview()
     }
     
     // MARK: UIScrollViewDelegate

Yep/Views/AudioWaves/SampleView.swift

@@ -72,7 +72,7 @@ class SampleView: UIView {
                 for (index, percent) in enumerate(samples) {
 
                     let x = CGFloat(index) * sampleWidth + sampleGap * CGFloat(index)
-                    let sampleHeightMax = viewHeight * 0.8
+                    let sampleHeightMax = viewHeight * 0.7
                     var realSampleHeight = percent * viewHeight
 
                     realSampleHeight = realSampleHeight < 1 ? 1 : realSampleHeight

Yep/Views/AudioWaves/YepWaverView.swift

@@ -31,9 +31,19 @@ class YepWaverView: UIView {
     }
     
     private func setup() {
-        waver = Waver(frame: CGRectMake(0, CGRectGetHeight(self.bounds)/2.0 - 50.0, CGRectGetWidth(self.bounds), 100.0))
+        waver = Waver(frame: CGRectMake(0, CGRectGetHeight(self.bounds)/2.0 - 50.0 - 40.0, CGRectGetWidth(self.bounds), 100.0))
         self.backgroundColor = UIColor(white: 1.0, alpha: 0.9)
+    }
+    
+    override func willMoveToSuperview(newSuperview: UIView?) {
+        super.willMoveToSuperview(newSuperview)
         self.addSubview(waver)
     }
+    
+    override func removeFromSuperview() {
+        super.removeFromSuperview()
+        waver.removeFromSuperview()
+    }
+
 
 }