iOS:fix Refreshable

doric-iOS/Pod/Classes/Refresh/DoricRefreshableNode.m

@@ -100,7 +100,6 @@ - (void)blendContent {
             self.view.contentView = it.view;
         }];
     }
-    [self.view.contentView.doricLayout apply:self.view.frame.size];
 }
 
 - (void)blendHeader {
@@ -137,7 +136,13 @@ - (void)blendHeader {
             self.view.headerView = it.view;
         }];
     }
+}
+
+- (void)requestLayout {
     [self.view.headerView.doricLayout apply:self.view.frame.size];
+    self.view.headerView.bottom = 0;
+    self.view.headerView.centerX = self.view.width / 2;
+    [self.view.contentView.doricLayout apply:self.view.frame.size];
 }
 
 - (void)blendSubNode:(NSDictionary *)subModel {

doric-iOS/Pod/Classes/Refresh/DoricSwipeRefreshLayout.m

@@ -77,6 +77,14 @@ - (void)setHeaderView:(UIView *)headerView {
     self.refreshable = YES;
 }
 
+- (void)layoutSubviews {
+    [super layoutSubviews];
+    if (self.contentOffset.y != 0) {
+        return;
+    }
+    self.contentSize = self.frame.size;
+}
+
 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
     if (-scrollView.contentOffset.y >= self.headerView.height) {
         dispatch_async(dispatch_get_main_queue(), ^{