Fix alpha problem

Fix alpha problem

MJRefresh/Base/MJRefreshComponent.m

@@ -112,7 +112,7 @@ - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(N
     }
     
     // 看不见
-    if (self.hidden || self.alpha <= 0.01) return;
+    if (self.hidden) return;
     if ([keyPath isEqualToString:MJRefreshKeyPathContentOffset]) {
         [self scrollViewContentOffsetDidChange:change];
     } else if ([keyPath isEqualToString:MJRefreshKeyPathPanState]) {

MJRefreshExample/MJRefreshExample/Base.lproj/Main.storyboard

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8121.17" systemVersion="14E33b" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="06B-cM-i4B">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="7703" systemVersion="14F25a" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="06B-cM-i4B">
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8101.14"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6711"/>
     </dependencies>
     <scenes>
         <!--Tab Bar Controller-->

MJRefreshExample/MJRefreshExample/Classes/MJSingleViewController.m

@@ -40,7 +40,6 @@ - (void)viewDidLoad {
             [tableView.footer endRefreshing];
         });
     }];
-    tableView.footer.automaticallyChangeAlpha = YES;
 }
 
 - (NSInteger)tableView:(nonnull UITableView *)tableView numberOfRowsInSection:(NSInteger)section