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：
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//
// 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
)
}
}
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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：