[iOS] Screen rotation adjust. Initialize WeexCore before setting page…

… required width and viewportwidth. (#2568)

ios/playground/WeexDemo/WXDemoViewController.m

@@ -82,7 +82,10 @@ - (void)viewDidAppear:(BOOL)animated
     [self updateInstanceState:WeexInstanceAppear];
 
     AppDelegate* appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
-    appDelegate.allowRotation = _instance && [_instance isKeepingRawCssStyles];
+    appDelegate.allowRotation = NO;
+    [_instance isKeepingRawCssStyles:^(BOOL value) {
+        appDelegate.allowRotation = value;
+    }];
 }
 
 - (void)viewDidDisappear:(BOOL)animated
@@ -191,7 +194,10 @@ - (void)render
         [weakSelf updateInstanceState:WeexInstanceAppear];
 
         AppDelegate* appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
-        appDelegate.allowRotation = theInstance && [theInstance isKeepingRawCssStyles];
+        appDelegate.allowRotation = NO;
+        [theInstance isKeepingRawCssStyles:^(BOOL value) {
+            appDelegate.allowRotation = value;
+        }];
     };
 
     _instance.updateFinish = ^(UIView *view) {

ios/sdk/WeexSDK/Sources/Bridge/WXCoreBridge.mm

@@ -1061,13 +1061,15 @@ + (CGSize)getDeviceSize
 
 + (void)setViewportWidth:(NSString*)pageId width:(CGFloat)width
 {
+    [WXCoreBridge install];
     if (platformBridge) {
         platformBridge->core_side()->SetViewPortWidth([pageId UTF8String] ?: "", (float)width);
     }
 }
 
 + (void)setPageRequired:(NSString *)pageId width:(CGFloat)width height:(CGFloat)height
 {
+    [WXCoreBridge install];
     if (platformBridge) {
         platformBridge->core_side()->SetDeviceDisplayOfPage([pageId UTF8String] ?: "", (float)width, (float)height);
     }

ios/sdk/WeexSDK/Sources/Model/WXSDKInstance.h

@@ -367,25 +367,26 @@ typedef NS_ENUM(NSInteger, WXErrorCode) {//error.code
  * internally for later use. Or you can use MetaModule's setPageArguments method and provide "reserveCssStyles" as "true" before rendering the page.
  */
 - (void)setPageKeepRawCssStyles;
-- (BOOL)isKeepingRawCssStyles;
+- (void)isKeepingRawCssStyles:(void(^)(BOOL))callback;
 
 /**
  * Set additional argument value for WeexCore
  */
 - (void)setPageArgument:(NSString*)key value:(NSString*)value;
 
 /**
- * Application required Page Width and Height to prevent Weex use DeviceWidth directly.
+ * Set specific required page width and height to prevent this page using global values.
  */
 - (void)setPageRequiredWidth:(CGFloat)width height:(CGFloat)height;
 
+/**
+ * Set specific required view port width prevent this page using global value (750px).
+ */
 - (void)setViewportWidth:(CGFloat)width;
 
 /** 
  * Deprecated 
  */
-
-
 @property (nonatomic, strong) NSDictionary *properties DEPRECATED_MSG_ATTRIBUTE();
 @property (nonatomic, assign) NSTimeInterval networkTime DEPRECATED_MSG_ATTRIBUTE();
 @property (nonatomic, copy) void (^updateFinish)(UIView *);

ios/sdk/WeexSDK/Sources/Model/WXSDKInstance.m

@@ -223,22 +223,13 @@ - (void)setPageKeepRawCssStyles
     [self setPageArgument:@"reserveCssStyles" value:@"true"];
 }
 
-- (BOOL)isKeepingRawCssStyles
-{
-    if ([NSThread currentThread] == [WXComponentManager componentThread]) {
-        return [WXCoreBridge isKeepingRawCssStyles:_instanceId];
-    }
-    else {
-        __block BOOL result = NO;
-        NSString* pageId = _instanceId;
-        dispatch_semaphore_t sem = dispatch_semaphore_create(0);
-        WXPerformBlockOnComponentThread(^{
-            result = [WXCoreBridge isKeepingRawCssStyles:pageId];
-            dispatch_semaphore_signal(sem);
-        });
-        dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
-        return result;
-    }
+- (void)isKeepingRawCssStyles:(void(^)(BOOL))callback {
+    NSString* pageId = _instanceId;
+    WXPerformBlockOnComponentThread(^{
+        if (callback) {
+            callback([WXCoreBridge isKeepingRawCssStyles:pageId]);
+        }
+    });
 }
 
 - (void)setPageArgument:(NSString*)key value:(NSString*)value