cocos2d-x 使用UIWebView加载网页(顺便可以看到如何用OC调C++)

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原文地址: http://www.cocos2dev.com/?p=248

前段时间项目中要微博授权登陆，使用的是web登陆方式。所以要在cocos2d-x中显示网页。所以就将UIWebView用进来了。

实现上讲也不是很难，你开打AppController.mm，你可以看到cocos2d-x的场景是被加载在一个EAGLView上面。所以我只需要取到EAGLView，在上面加一个UIView，UIView上面就可以放我的UIWebView。

实现：FMUIWebViewBridge.h

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#import <Foundation/Foundation.h>   #import <CoreLocation/CoreLocation.h>   #import <UIKit/UIKit.h>   &nbsp;   #import "FMLayerWebView.h"   &nbsp;   @interface FMUIWebViewBridge : NSObject<UIWebViewDelegate,UIAlertViewDelegate>{   FMLayerWebView * mLayerWebView;   UIView    *mView;   UIWebView *mWebView;   UIToolbar *mToolbar;   UIBarButtonItem *mBackButton;   }   &nbsp;   -(void) setLayerWebView : (FMLayerWebView*) iLayerWebView URLString:(const char*) urlString;   -(void) backClicked:(id)sender;   &nbsp;   @end

FMUIWebViewBridge.mm

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//   //  FMUIWebViewBridge.cpp   //  WebViewDemo   //   //  Created by Yanghui Liu on 12-6-5.   //  Copyright (c) 2012年 FMinutes company. All rights reserved.   //   #import "FMUIWebViewBridge.h"   #import "EAGLView.h"   @implementation FMUIWebViewBridge   - (id)init{   self = [super init];   if (self) {   // init code here.   }   return self;   }   - (void)dealloc{   [mBackButton release];   [mToolbar release];   [mWebView release];   [mView release];   [super dealloc];   }       -(void) setLayerWebView : (FMLayerWebView*) iLayerWebView URLString:(const char*) urlString{   mLayerWebView = iLayerWebView;   cocos2d::CCSize size = mLayerWebView-> getContentSize();   mView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.width , size.height)];   // create webView   //Bottom size   int wBottomMargin = size.height*0.10;   int wWebViewHeight = size.height - wBottomMargin;   mWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, size.width, wWebViewHeight)];   mWebView.delegate = self;   NSString *urlBase = [NSString stringWithCString:urlString encoding:NSUTF8StringEncoding];   [mWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlBase ]]];   [mWebView setUserInteractionEnabled:NO]; //don't let the user scroll while things are   //create a tool bar for the bottom of the screen to hold the back button   mToolbar = [UIToolbar new];   [mToolbar setFrame:CGRectMake(0, wWebViewHeight, size.width, wBottomMargin)];   mToolbar.barStyle = UIBarStyleBlackOpaque;   //Create a button   mBackButton = [[UIBarButtonItem alloc] initWithTitle:@"Back"   style: UIBarButtonItemStyleDone   target: self   action:@selector(backClicked:)];   //[backButton setBounds:CGRectMake(0.0, 0.0, 95.0, 34.0)];   [mToolbar setItems:[NSArray arrayWithObjects:mBackButton,nil] animated:YES];   [mView addSubview:mToolbar];   //[mToolbar release];       // add the webView to the view   [mView addSubview:mWebView];   [[EAGLView sharedEGLView] addSubview:mView];   }       - (void)webViewDidStartLoad:(UIWebView *)thisWebView {   }       - (void)webViewDidFinishLoad:(UIWebView *)thisWebView{   [mWebView setUserInteractionEnabled:YES];   mLayerWebView->webViewDidFinishLoad();   }       - (void)webView:(UIWebView *)thisWebView didFailLoadWithError:(NSError *)error {   if ([error code] != -999 && error != NULL) { //error -999 happens when the user clicks on something before it's done loading.       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Network Error" message:@"Unable to load the page. Please keep network connection."   delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];   [alert show];   [alert release];       }   }       -(void) backClicked:(id)sender {   mWebView.delegate = nil; //keep the webview from firing off any extra messages   //remove items from the Superview...just to make sure they're gone   [mToolbar removeFromSuperview];   [mWebView removeFromSuperview];   [mView removeFromSuperview];   mLayerWebView->onBackbuttonClick();   }   @end

因为这些都是OC代码，所以文件后缀使用mm，为了和C++代码混编。代码很简答，应该看得懂，我就不解释了。

下面就是封装这个oc代码，

FMLayerWebView.h

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//   //  FMLayerWebView.h   //  WebViewDemo   //   //  Created by Yanghui Liu on 12-6-5.   //  Copyright (c) 2012年 FMinutes company. All rights reserved.   //   &nbsp;   #ifndef WebViewDemo_FMLayerWebView_h   #define WebViewDemo_FMLayerWebView_h   &nbsp;   #include "CCCommon.h"   #include "cocos2d.h"   USING_NS_CC;   class FMLayerWebView : public CCLayer{   public:   FMLayerWebView();   ~FMLayerWebView();   virtual bool init();   LAYER_NODE_FUNC(FMLayerWebView);   void webViewDidFinishLoad();   void onBackbuttonClick();   private:   int mWebViewLoadCounter;   };   &nbsp;   #endif <div></div>

FMLayerWebView.mm

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//   //  FMLayerWebView.mm   //  WebViewDemo   //   //  Created by Yanghui Liu on 12-6-5.   //  Copyright (c) 2012年 FMinutes company. All rights reserved.   //       #include "FMLayerWebView.h"   #include "FMUIWebViewBridge.h"       static FMUIWebViewBridge *g_FMUIWebViewBridge=nil;       FMLayerWebView::FMLayerWebView(){   }       FMLayerWebView::~FMLayerWebView(){   [g_FMUIWebViewBridge release];   }       void FMLayerWebView::webViewDidFinishLoad(){   }       void FMLayerWebView::onBackbuttonClick(){   this->removeFromParentAndCleanup(true);   }       bool FMLayerWebView::init(){   if ( !CCLayer::init() ){   return false;   }   g_FMUIWebViewBridge = [[FMUIWebViewBridge alloc] init];   [g_FMUIWebViewBridge setLayerWebView : this URLString:"http://www.cocos2dev.com"];   return true;   }

OK ,这样就完成了。

调用方法：

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FMLayerWebView* web = FMLayerWebView::node();   web->setPosition(CCPointZero);   addChild(web);