[iOS] Public methods for getting/setting global device size. (#2534)

Author: wqyfavor

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

@@ -1046,13 +1046,15 @@ + (void)setDefaultDimensionIntoRoot:(NSString*)pageId width:(CGFloat)width heigh
 
 + (void)setDeviceSize:(CGSize)size
 {
+    [WXCoreBridge install];
     WeexCore::WXCoreEnvironment* env = WeexCore::WXCoreEnvironment::getInstance();
     env->SetDeviceWidth(std::to_string(size.width));
     env->SetDeviceHeight(std::to_string(size.height));
 }
 
 + (CGSize)getDeviceSize
 {
+    [WXCoreBridge install];
     WeexCore::WXCoreEnvironment* env = WeexCore::WXCoreEnvironment::getInstance();
     return CGSizeMake(env->DeviceWidth(), env->DeviceHeight());
 }

ios/sdk/WeexSDK/Sources/Engine/WXSDKEngine.h

@@ -215,6 +215,21 @@
  */
 + (void)connectDevToolServer:(NSString *)URL;
 
+/**
+ * @abstract Set the global device size of all pages.
+ * You could also set unique device size used by a page using interface of WXSDKInstance.
+ *
+ * @param size, the device size in UIKit system.
+ *
+ */
++ (void)setGlobalDeviceSize:(CGSize)size;
+
+/**
+ * @abstract Get the current global device size used by pages.
+ *
+ */
++ (CGSize)getGlobalDeviceSize;
+
 @end
 
 @interface WXSDKEngine (Deprecated)

ios/sdk/WeexSDK/Sources/Engine/WXSDKEngine.m

@@ -41,6 +41,7 @@
 #import "WXExceptionUtils.h"
 #import "WXConfigCenterProtocol.h"
 #import "WXComponent+Layout.h"
+#import "WXCoreBridge.h"
 
 @implementation WXSDKEngine
 
@@ -370,6 +371,16 @@ + (void)connectDevToolServer:(NSString *)URL
     [[WXSDKManager bridgeMgr] connectToDevToolWithUrl:[NSURL URLWithString:URL]];
 }
 
++ (void)setGlobalDeviceSize:(CGSize)size
+{
+    [WXCoreBridge setDeviceSize:size];
+}
+
++ (CGSize)getGlobalDeviceSize
+{
+    return [WXCoreBridge getDeviceSize];
+}
+
 + (void)_originalRegisterComponents:(NSDictionary *)components {
     NSMutableDictionary * mutableComponents = [components mutableCopy];
     void (^componentBlock)(id, id, BOOL *) = ^(id mKey, id mObj, BOOL * mStop) {