no message

zhangxiaowen
1 parent eff265f3
Showing 1 changed file with 14 additions and 11 deletions
CNLiveMineModule/Classes/Controller/CNLiveMineController.m
@@ -195,16 +195,18 @@ static const NSInteger kHEIGHT = 250;
         }
     }
  
-    if (point.y > -200) {
-        [UIView animateWithDuration:0.25 animations:^{
-            self.navigationBar.frame = CGRectMake(0, 0, SCREEN_WIDTH, NavigationContentTop);
-        }];
-  
-    } else {
-        [UIView animateWithDuration:0.25 animations:^{
-            self.navigationBar.frame = CGRectMake(0, -NavigationContentTop, SCREEN_WIDTH, NavigationContentTop);
-        }];
-   
+    CGFloat offsetToShow = 50.0;//滑动多少就完全显示
+    
+    CGFloat offsetY = scrollView.contentOffset.y+kHEIGHT;
+    if (offsetY <= 0) {
+        _navigationBar.alpha = 0.0;
+    }
+    else if (offsetY > offsetToShow) {
+        _navigationBar.alpha = 1.0;
+    }
+    else {
+        CGFloat alpha = MIN((offsetY / offsetToShow), 1);
+        _navigationBar.alpha = alpha;
     }
  
 }
@@ -300,8 +302,9 @@ static const NSInteger kHEIGHT = 250;
 }
 - (CNLiveMineNavigationBar *)navigationBar {
     if (!_navigationBar) {
-        _navigationBar = [[CNLiveMineNavigationBar alloc]initWithFrame:CGRectMake(0, -NavigationContentTop, SCREEN_WIDTH, NavigationContentTop)];
+        _navigationBar = [[CNLiveMineNavigationBar alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, NavigationContentTop)];
         _navigationBar.backgroundColor = [UIColor colorWithRed:32/255.0 green:31/255.0 blue:36/255.0 alpha:1.0];
+        _navigationBar.alpha = 0.0;
     }
     return _navigationBar;
 }