[iOS] fix backgroundColor bug when modify div color

jianhan-he · jianhan-he · commit 481d811acefe · 2018-12-20T12:32:35.000+08:00
diff --git a/ios/sdk/WeexSDK/Sources/View/WXComponent+ViewManagement.mm b/ios/sdk/WeexSDK/Sources/View/WXComponent+ViewManagement.mm
@@ -314,7 +314,7 @@ - (void)_resetStyles:(NSArray *)styles
         [self setNeedsDisplay];
     }
     if (styles && [styles containsObject:@"backgroundImage"]) {
-        _backgroundImage = @"linear-gradient(to left,rgba(255,255,255,0),rgba(255,255,255,0))"; // if backgroundImage is nil, give defalut color value.
+        _backgroundImage = nil;
         [self setGradientLayer];
     }
     

Original file line number	Diff line number	Diff line change
`@@ -314,7 +314,7 @@ - (void)_resetStyles:(NSArray *)styles`
`314`	`314`	`[self setNeedsDisplay];`
`315`	`315`	`}`
`316`	`316`	`if (styles && [styles containsObject:@"backgroundImage"]) {`
`317`		`- _backgroundImage = @"linear-gradient(to left,rgba(255,255,255,0),rgba(255,255,255,0))"; // if backgroundImage is nil, give defalut color value.`
	`317`	`+ _backgroundImage = nil;`
`318`	`318`	`[self setGradientLayer];`
`319`	`319`	`}`
`320`	`320`