iOS Webview 实现修改javascript confirm 和 alert

贴代码：

@interface UIWebView (JavaScriptAlert)  
-(void) webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame;  
- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame;  
@end  
  
@implementation UIWebView (JavaScriptAlert)  
  
- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {  
    UIAlertView* customAlert = [[UIAlertView alloc] initWithTitle:@"助手提示" message:message delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];  
    [customAlert show];  
}  
static BOOL diagStat = NO;  
static NSInteger bIdx = -1;  
- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(id)frame {  
    UIAlertView *confirmDiag = [[UIAlertView alloc] initWithTitle:@"助手提示"  
                                                          message:message  
                                                         delegate:self  
                                                cancelButtonTitle:@"取消"  
                                                otherButtonTitles:@"确定", nil nil];  
      
    [confirmDiag show];  
    bIdx = -1;  
      
    while (bIdx==-1) {  
        //[NSThread sleepForTimeInterval:0.2];  
        [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1f]];  
    }  
    if (bIdx == 0){//取消;  
        diagStat = NO;  
    }  
    else if (bIdx == 1) {//确定;  
        diagStat = YES;  
    }  
    return diagStat;  
}  
  
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{  
    bIdx = buttonIndex;  
}  
  
@end

关于WKWebView:

之前用WebView装载一个网页时，弹出Alert时会显示网址，由于不想把网址暴露给用户这样显示就不是很友好了。UIWebView文档内没有找到可以捕获这类信息的API。GOOGLE了下发现了WKWebView组件，WKWebView是IOS8新推出的组件，目的是给出一个新的高性能的 Web View 解决方案，摆脱过去 UIWebView 的老旧笨重特别是内存占用量巨大的问题。以下为示例代码：

//
//  ViewController.swift
//  KenWKWebView
//
//  Created by KenNgai on 10/10/15.
//  Copyright © 2015 IT. All rights reserved.
//
 
import UIKit
import WebKit //导入WebKit  WKWebView应该是用Webkit内核
 
class ViewController: UIViewController,WKNavigationDelegate,WKUIDelegate {
 
    var wkBrowser:WKWebView!
     
    override func viewDidLoad() {
        super.viewDidLoad()
        self.wkBrowser = WKWebView(frame: self.view.frame)
        //self.wkBrowser.loadRequest(NSURLRequest(URL: NSURL(string: "http://www.baidu.com")!))
        let html = "<html><title>Dialog</title><style type='text/css'>body{font-size:60px}</style><script type='text/javascript'>function myconfirm(){if(confirm('Star it?')){alert('Done')}}</script><body><a href="javascript:alert('Just Alert')" >Alert</a><br /><a href="javascript:myconfirm()">Logout</a></body></html>"
        self.wkBrowser.loadHTMLString(html, baseURL: nil)
        self.wkBrowser.navigationDelegate = self
        self.wkBrowser.UIDelegate = self
        self.view.addSubview(wkBrowser)
    }
     
 
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
 
}
 
//捕捉异常信息
private typealias wkNavigationDelegate = ViewController
extension wkNavigationDelegate {
    func webView(webView: WKWebView, didFailNavigation navigation: WKNavigation!, withError error: NSError) {
        NSLog(error.debugDescription)
    }
     
    func webView(webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: NSError) {
        NSLog(error.debugDescription)
    }
}
 
private typealias wkUIDelegate = ViewController
extension wkUIDelegate {
    //HTML页面Alert出内容
    func webView(webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: () -> Void) {
        let ac = UIAlertController(title: webView.title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        ac.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: { (a) -> Void in
            completionHandler()
        }))
         
        self.presentViewController(ac, animated: true, completion: nil)
    }
     
    //HTML页面弹出Confirm时调用此方法
    func webView(webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: (Bool) -> Void) {
        let ac = UIAlertController(title: webView.title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        ac.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:
            { (ac) -> Void in
                completionHandler(true)  //按确定的时候传true
        }))
         
        ac.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler:
            { (ac) -> Void in
                completionHandler(false)  //取消传false
        }))
         
        self.presentViewController(ac, animated: true, completion: nil)
    }
}

如果你访问的页面的协议是https那么要在info.list同添加以下Key:

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

具体可参考：https://lvwenhan.com/ios/460.html

链接：

iOS Webview 实现修改javascript confirm 和 alert

UIWebView 屏蔽 alert警告框

WKWebView捕获HTML弹出的Alert和Confirm

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原文地址：https://www.cnblogs.com/On1Key/p/5848422.html