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:@"%@
",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;
}
}