IOS 设置UIViewController为配景半透明浮层弹窗，检察富文本图片详情 ...

使用场景：UIViewController1 打开 UIViewController2（配景半透明弹窗）
案例：打开富文本网页<img>图片的url检察图片详情
WKWebView  WKNavigationDelegate代理方法设置js代码点击事件 

1. ///注册添加图片标签点击js方法
2. - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
3.     ///js添加图片点击事件
4.     NSString *jsClickImage =@"function registerImageClickAction(){var imgs=document.getElementsByTagName('img');var length=imgs.length;for(var i=0; i < length;i++){img=imgs[i];if("ad" ==img.getAttribute("flag")){var parent = this.parentNode;if(parent.nodeName.toLowerCase() != "a")return;}img.onclick=function(){window.location.href='image-preview:'+this.src}}}";
5.    
6.     [webView evaluateJavaScript:jsClickImage completionHandler:nil];
7.     [webView evaluateJavaScript:@"registerImageClickAction()" completionHandler:nil];
8.    
9.     [webView evaluateJavaScript:@"document.body.scrollHeight" completionHandler:^(id _Nullable result,NSError *_Nullable error) {
10.         //获取webView内容高度
11.         CGFloat height = [result doubleValue];
12. //        [webView mas_updateConstraints:^(MASConstraintMaker *make) {
13. //              make.height.equalTo(@(height));
14. //        }];
15.         webView.frame = CGRectMake(0, 0, self.frame.size.width, height);
16.         [webView layoutIfNeeded];
17.         [webView setNeedsLayout];
18.         if (self.contentHeightCallback != nil) {
19.             self.contentHeightCallback(CGSizeMake(self.frame.size.width, height));
20.         }
21.     }];
22.    
23. }
25. ///拦截点击图片
26. - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
27.     NSString *requestString = navigationAction.request.URL.absoluteString;
28.     NSString *imgKey = @"image-preview";
29.     if([requestString hasPrefix: imgKey]){
30.         NSString *url = [requestString substringFromIndex:imgKey.length+1];
31.         //查看图片详情
32.         [self showPicDetail:url];
33.         decisionHandler(WKNavigationActionPolicyCancel);
34.         return;
35.     }
36.     decisionHandler(WKNavigationActionPolicyAllow);
37. }

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showPicDetail)  方法打开浮窗：

1. -(void) showPicDetail:(NSString *)imgUrl{
2.     ShowBigPicDetailViewController *vc = [[ShowBigPicDetailViewController alloc] init];
3.     vc.imageUrl = imageUrl;
4.     //设置全屏显示   关键语句，必须有
5.     vc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
6.     [self presentViewController:vc animated:YES completion:nil];
7. }

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设置UIViewController2 配景半透明

1. - (void)viewDidLoad {
2.     [super viewDidLoad];
3.     //设置半透明背景
4.     [self.view setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0.5f]];
5.     ...
6. }

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关闭浮窗弹窗：

1. [self dismissViewControllerAnimated:YES completion:nil];

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