UIWebView 屏蔽或者修改 alert警告框-白红宇

UIWebView 屏蔽或者修改 alert警告框

阅读量：4973 次

发布时间：2019-06-12

本文共 4105 字，大约阅读时间需要 13 分钟。

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)