Github user kfeagle commented on a diff in the pull request:
https://github.com/apache/incubator-weex/pull/35#discussion_r104340578
--- Diff: ios/sdk/WeexSDK/Sources/Component/WXHeaderComponent.m ---
@@ -0,0 +1,76 @@
+/**
+ * Created by Weex.
+ * Copyright (c) 2016, Alibaba, Inc. All rights reserved.
+ *
+ * This source code is licensed under the Apache Licence 2.0.
+ * For the full copyright and license information,please view the LICENSE
file in the root directory of this source tree.
+ */
+
+#import "WXHeaderComponent.h"
+#import "WXComponent_internal.h"
+
+@implementation WXHeaderComponent
+{
+ BOOL _isUseContainerWidth;
+}
+
+- (instancetype)initWithRef:(NSString *)ref type:(NSString *)type
styles:(NSDictionary *)styles attributes:(NSDictionary *)attributes
events:(NSArray *)events weexInstance:(WXSDKInstance *)weexInstance
+{
+ self = [super initWithRef:ref type:type styles:styles
attributes:attributes events:events weexInstance:weexInstance];
+
+ if (self) {
+ _async = YES;
+ _isNeedJoinLayoutSystem = NO;
+ _keepScrollPosition = attributes[@"keepScrollPosition"] ?
[WXConvert BOOL:attributes[@"keepScrollPosition"]] : NO;
+ }
+
+ return self;
+}
+
+- (void)updateAttributes:(NSDictionary *)attributes
+{
+ if (attributes[@"keepScrollPosition"]) {
+ _keepScrollPosition = [WXConvert
BOOL:attributes[@"keepScrollPosition"]];
+ }
+}
+
+- (BOOL)isSticky
+{
+ return _positionType == WXPositionTypeSticky;
+}
+
+- (void)_frameDidCalculated:(BOOL)isChanged
+{
+ [super _frameDidCalculated:isChanged];
+
+ if (isChanged) {
+ [self.delegate headerDidLayout:self];
+ }
+}
+
+- (void)_removeFromSupercomponent
+{
+ [super _removeFromSupercomponent];
+
+ [self.delegate headerDidRemove:self];
--- End diff --
add respondsToSelector ?
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