iOS UIWebView处理url的打开、跳转、返回、关闭

最新推荐文章于 2021-06-19 02:34:22 发布

原创最新推荐文章于 2021-06-19 02:34:22 发布 · 9.7k 阅读

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本文介绍如何使用UIWebView加载指定网址，并实现自定义导航按钮、处理返回逻辑、获取页面标题及图片资源等功能。

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<UIWebViewDelegate>

@property (strong,nonatomic)IBOutletUIWebView *webView;// storyBoard加载的

@property (nonatomic,strong)UIActionSheet *ActionSheet;

@property (nonatomic,strong)NSString *tittle;

@property (nonatomic,strong)NSMutableArray *mUrlArray;



- (void)viewDidLoad {

    [superviewDidLoad];

    [selfaddLeftButton];

    _url=@"https://www.xxxx.com/";

    [selfopenUrlWithString:_url];

}


//左按钮自定义

- (void)addLeftButton{

    UIButton * backButton = [UIButtonbuttonWithType:UIButtonTypeSystem];

    backButton.frame =CGRectMake(10,20,20,20);

    [backButtonsetBackgroundImage:[UIImageimageNamed:@"goBack@2x"]forState:UIControlStateNormal];

    [backButtonaddTarget:selfaction:@selector(back:)forControlEvents:UIControlEventTouchUpInside];

    UIButton * guanBi = [UIButtonbuttonWithType:UIButtonTypeSystem];

    guanBi.frame =CGRectMake(10,20,40,20);

//    [guanBi setBackgroundImage:[UIImage imageNamed:@"goBack@2x"] forState:UIControlStateNormal];

    [guanBisetTitle:@"关闭"forState:UIControlStateNormal];

    [guanBiaddTarget:selfaction:@selector(closeWebView)forControlEvents:UIControlEventTouchUpInside];

    self.navigationItem.leftBarButtonItems =@[[[UIBarButtonItemalloc]initWithCustomView:backButton],[[UIBarButtonItemalloc]initWithCustomView:guanBi]];

}


- (void)openUrlWithString:(NSString *)urlStr{

    _webView.backgroundColor = [UIColorclearColor];

    for (UIView * viewsin [self.webViewsubviews]) {

        if ([views isKindOfClass:[UIScrollViewclass]]) {

            //去掉水平方向的滑动条

            [(UIScrollView *)viewssetShowsHorizontalScrollIndicator:NO];

            //去掉垂直方向的滑动条

            [(UIScrollView *)viewssetShowsVerticalScrollIndicator:NO];

            for (UIView * inScrollViewin views.subviews) {

                if ([inScrollViewisKindOfClass:[UIImageViewclass]]) {

                    //隐藏上下滚动出边界时的黑色的图片

                    inScrollView.hidden =YES;

                }

            }

        }

    }

    NSURL * url = [NSURLURLWithString:urlStr];

    NSURLRequest * request = [NSURLRequestrequestWithURL:url];

    _webView.delegate =self;

    [_webView loadRequest:request];

}


//用苹果自带的返回键按钮处理如下(自定义的返回按钮)

- (void)back:(UIBarButtonItem *)btn {

    if ([self.webView canGoBack]) {

        [self.webView goBack];

        

    }else{

        [self.viewresignFirstResponder];

        [self.navigationControllerpopViewControllerAnimated:YES];

    }

}


//如果是H5页面里面自带的返回按钮处理如下:

#pragma mark - webViewDelegate

//- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {

//    NSString * requestString = [[request URL] absoluteString];

//    requestString = [requestString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//    //获取H5页面里面按钮的操作方法,根据这个进行判断返回是内部的还是push的上一级页面

//    if ([requestString hasPrefix:@"goback:"]) {

//        [self.navigationController popViewControllerAnimated:YES];

//    }else{

//        [self.webView goBack];

//    }

//    return YES;

//}


//网址加载结束代理方法

- (void)webViewDidFinishLoad:(UIWebView *)webView {

    [_webViewstopLoading];

    // 获取标题

    NSString * title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];//获取当前页面的title

    if (title.length >=1) {

        _tittle = title;

    }else{

       _tittle =@"无标题";

    }

    self.title =_tittle;

    // 获取图片地址

    static NSString *const jsGetImages =

    @"function getImages(){\

    var objs = document.getElementsByTagName(\"img\");\

    var imgScr = '';\

    for(var i=0;i<objs.length;i++){\

    imgScr = imgScr + objs[i].src + '+';\

    };\

    return imgScr;\

    };";

    [webView stringByEvaluatingJavaScriptFromString:jsGetImages];//注入js方法

    NSString *urlResurlt = [webView stringByEvaluatingJavaScriptFromString:@"getImages()"];

    _mUrlArray = [NSMutableArray arrayWithArray:[urlResurltcomponentsSeparatedByString:@"+"]];

    if (_mUrlArray.count >=2) {

        [_mUrlArray removeLastObject];

    }

    NSLog(@"图片地址为 = %@",_mUrlArray[0]);

    _iamgeve = [[UIImageView alloc]init];

   //加载图片地址的图片

    [_iamgevesd_setImageWithURL:_mUrlArray[0]];

    //获取当前网页的html

//    NSString *lJs = @"document.documentElement.innerHTML";

//    _currentHTML = [webView stringByEvaluatingJavaScriptFromString:lJs];

//    NSLog(@"_currentHTML = %@",_currentHTML);

   //获取当前网页地址

    _currentURL = [[NSStringalloc]initWithString:webView.request.URL.absoluteString];

    NSLog(@"_currentURL = %@",_currentURL);

}


//关闭

- (void)closeWebView {

    [_webViewstopLoading];

    //清除cookies

    NSHTTPCookie *cookie;

    NSHTTPCookieStorage *storage = [NSHTTPCookieStoragesharedHTTPCookieStorage];

    for (cookiein [storagecookies]) {

        [storage deleteCookie:cookie];

    }

    //清除UIWebView的缓存

    [[NSURLCachesharedURLCache]removeAllCachedResponses];

    NSURLCache * cache = [NSURLCachesharedURLCache];

    [cache removeAllCachedResponses];

    [cache setDiskCapacity:0];

    [cache setMemoryCapacity:0];

    [self.navigationControllerpopViewControllerAnimated:YES];

}