JS和OC交互的简单应用

Posted 2020-08-23 ITCoderW

先简单地说一下思路吧

• 需求：在App中嵌入一个webView，已经有了网址，但是需要去掉这个网页中的一些内容
• 解决方案：取到webView要加载的网址，对这个网址对应的网页信息进行修改
• 简单描述：

1. 1. 遵守webView的协议

      <UIWebViewDelegate>

   2. 设置代理
   3. 实现相应代理方法，对网页信息中要删除的内容对应到节点，并删除
      • 删除的部分处理：获取到相应的节点并执行删除操作的语句写法有三种方式：见http://www.w3school.com.cn/js/js_htmldom.asp

 

 1 #import "JSHanledWebViewController.h"
 2 
 3 //1.遵守协议
 4 @interface JSHanledWebViewController ()<UIWebViewDelegate>
 5 @property (weak, nonatomic) IBOutlet UIWebView *webView;
 6 
 7 @end
 8 
 9 @implementation JSHanledWebViewController
10 
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     
14     //2.设置代理
15     self.webView.delegate = self;
16     [self loadWebView];
17     
18 }
19 
20 #pragma mark - 加载webView
21 - (void)loadWebView{
22     
23     [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.dianping.com/tuan/deal/66666"]]];
24     //关闭webView的弹簧效果
25     self.webView.scrollView.bounces = NO;
26     //隐藏滚动条
27     self.webView.scrollView.showsVerticalScrollIndicator = NO;
28 
29 
30 }
31 
32 //3.实现相应代理方法
33 #pragma mark - Sent after a web view finishes loading a frame.
34 - (void)webViewDidFinishLoad:(UIWebView *)webView{
35     
36     NSMutableString *jsStrM = [NSMutableString string];
37     
38     //参考w3c: http://www.w3school.com.cn/js/js_htmldom.asp
39     //注意取出来的是个数组，注意指定下标
40     //取到顶部的导航栏
41     [jsStrM appendString:@"var header = document.getElementsByTagName(\'header\')[0];"];
42     [jsStrM appendString:@"header.parentNode.removeChild(header);"];
43     
44     //取到网页轮播器下的 立即购买
45     [jsStrM appendString:@"var costBox = document.getElementsByClassName(\'cost-box\')[0];"];
46     [jsStrM appendString:@"costBox.parentNode.removeChild(costBox);"];
47     
48     //取到灰色的立即购买
49     [jsStrM appendString:@"var buy = document.getElementsByClassName(\'buy-now btn-gray\')[0];"];
50     [jsStrM appendString:@"buy.parentNode.removeChild(buy);"];
51     
52     //取到底部的首页 点评团...
53     [jsStrM appendString:@"var footer = document.getElementsByClassName(\'footer\')[0];"];
54     [jsStrM appendString:@"footer.parentNode.removeChild(footer);"];
55     
56     //取到黄色的立即购买按钮
57     [jsStrM appendString:@"var footerBtn = document.getElementsByClassName(\'footer-btn-fix\')[0];"];
58     [jsStrM appendString:@"footerBtn.parentNode.removeChild(footerBtn);"];
59     
60     //The stringByEvaluatingjavascriptFromString: method waits synchronously for JavaScript evaluation to complete.
61     [webView stringByEvaluatingJavaScriptFromString:jsStrM];
62     
63 
64 }
65 
66 @end

 

• 最终的效果如下所示 

如有问题,敬请指正!