UIWebView 屏蔽或者修改 alert警告框

如果是网页内容里面的alert,我们可以等网页加载完毕,也就是在webViewDidFinishLoad中执行下面的js代码,就可以屏蔽alert了 [myWebView stringByEvaluatingJavaScriptFromString:@"window.alert=null;"]; 但上面的方法对于网页onLoad事件里面的alert就不起作用了 解决方法就是给UIWebView添加一个类别: 给工程添加JavaScriptAlert.h @interface UIWebView (JavaScriptAlert) - (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame; - (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame; @end 给工程添加JavaScriptAlert.m文件 @implementation UIWebView (JavaScriptAlert) - (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame { /* UIAlertView* dialogue = [[UIAlertView alloc] initWithTitle:nil message:message delegate:nil cancelButtonTitle:@"好" otherButtonTitles:nil]; [dialogue show]; [dialogue autorelease]; */ } - (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame{ return NO; } @end 其实runJavaScriptAlertPanelWithMessage和runJavaScriptConfirmPanelWithMessage是UIWebDelegate的成员函数,详情可以查阅UIWebDelegate的帮助文档

 

 

 

 JavaScript中有三种形式的弹出框，alert，confirm，prompt；

修改alert内容的话：

捕捉 JavaScript alert()   JavaScript confirm()  JavaScript prompt()这三种形式的

给工程添加JavaScriptAlert.h

@interface UIWebView (JavaScriptAlert) - (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame; - (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame;- (NSString *)webView:(UIWebView *)sender runJavaScriptTextInputPanelWithPrompt:(NSString *)str defaultText:(NSString *)mes initiatedByFrame:(WebFrame *)frame； @end 给工程添加JavaScriptAlert.m文件 @implementation UIWebView (JavaScriptAlert)

static BOOL diagStat = NO;

1、

- (BOOL)webView:(UIWebView *)sender runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame{     NSLog(@"javascript alert : %@",message);    UIAlertView *confirmDiag = [[UIAlertView alloc] initWithTitle:@"沃德餐饮提醒您" message:message delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", @"Cancel") otherButtonTitles:NSLocalizedString(@"OK", @"OK"), nil];    [confirmDiag show];        while (confirmDiag.hidden == NO && confirmDiag.superview != nil)                [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01f]];            [confirmDiag release];    return diagStat;}

 

 2、

- (void)webView:(UIWebView *)sender runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame {    UIAlertView* customAlert = [[UIAlertView alloc] initWithTitle:@"沃德餐饮提醒您" message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];    [customAlert show];    [customAlert autorelease];  }

 

3、- (NSString *)webView:(UIWebView *)sender runJavaScriptTextInputPanelWithPrompt:(NSString *)str defaultText:(NSString *)mes initiatedByFrame:(WebFrame *)frame{    NSString *subTitle = [NSString stringWithFormat:@"%@\n\n",str];    UIAlertView *promptDiag = [[UIAlertView alloc] initWithTitle:@"沃德餐饮提醒您" message:subTitle delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", @"Cancel") otherButtonTitles:NSLocalizedString(@"OK", @"OK"), nil];        UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(10, 80, 265, 30)];    //nameField.borderStyle =  UITextBorderStyleRoundedRect;    nameField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;    [nameField becomeFirstResponder];    nameField.backgroundColor = [UIColor whiteColor];    [promptDiag addSubview:nameField];    [nameField release];        [promptDiag show];        while (promptDiag.hidden == NO && promptDiag.superview != nil)                [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01f]];        [promptDiag release];    if(diagStat)    {        return nameField.text;    }    return mes;}- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    if (buttonIndex == 0)    {        diagStat = NO;    }     else if (buttonIndex == 1)     {        diagStat = YES;    } }

 

转载于:https://www.cnblogs.com/KingQiangzi/p/4043293.html

相关资源：数据结构—成绩单生成器