Update extend-ios.md (#222)
update Extend iOS
diff --git a/source/guide/extend-ios.md b/source/guide/extend-ios.md
index e60e8b5..4aa8303 100644
--- a/source/guide/extend-ios.md
+++ b/source/guide/extend-ios.md
@@ -267,7 +267,7 @@
- From v0.19, Weex replaced layout engine which is C++ codes. You can get css styles from styles dictionary of a WXComponent. You can also access flexCssNode property which is of type WeexCore::WXCoreLayoutNode, but must in .mm files.
-- From v0.20, WeexCore is imported to iOS, and css styles is never uploaded to WXComponent. The styles dictionary only contains non-css styles. We think that upper UI components should only care about final layout results generated by layout engine. If you still want to access css styles, you may use flexCssNode in .mm files or by extension methods provided in WXComponent+Layout.h.
+- From v0.20, WeexCore is imported to iOS, and css styles are never uploaded to WXComponent. The styles dictionary only contains non-css styles. We think that upper UI components should only care about final layout results generated by layout engine. If you still want to access css styles, you may use flexCssNode in .mm files or by extension methods provided in WXComponent+Layout.h.
```
/**
@@ -298,7 +298,6 @@
- (WXCoreAlignSelf)getCssStyleAlignSelf;
- (WXCorePositionType)getCssStylePositionType;
- (NSString*)convertLayoutValueToStyleValue:(NSString*)valueName;
-- (CGFloat)safeContainerStyleWidth;
```
### custom your handlers
