JS和OC交互的简单应用

 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