Use the UIWebView Shield alert warning box in IOS development _ios

If it is the contents of the page alert, we can wait for the page loaded, that is, in the Webviewdidfinishload to execute the following JS code, you can screen alert

[Mywebview stringbyevaluatingjavascriptfromstring:@ "window.alert=null;"];

But the above method doesn't work for alert in the Web page onload event.

The workaround is to add a category to UIWebView:

Add JavaScriptAlert.h to the project

@interface UIWebView (Javascriptalert) 
-(void) WebView: (UIWebView *) Sender Runjavascriptalertpanelwithmessage: ( NSString *) message initiatedbyframe: (Webframe *) frame;
-(BOOL) WebView: (UIWebView *) sender Runjavascriptconfirmpanelwithmessage: (NSString *) message initiatedbyframe: ( Webframe *) frame;
@end

Add javascriptalert.m files to the project

@implementation UIWebView (Javascriptalert)
-(void) WebView: (UIWebView *) sender Runjavascriptalertpanelwithmessage: (NSString *) message initiatedbyframe: (Webframe *) Frame {/*
Uialertview * dialogue = [[Uialertview alloc] initwithtitle:nil message:message delegate:nil cancelbuttontitle:@ "Good" Otherbuttontitles:nil];
[Dialogue show];
[Dialogue autorelease];
*/
}
-(BOOL) WebView: (UIWebView *) sender Runjavascriptconfirmpanelwithmessage: (NSString *) message Initiatedbyframe: (Webframe *) frame{return
NO;
}
@end

In fact, Runjavascriptalertpanelwithmessage and Runjavascriptconfirmpanelwithmessage are webuidelegate member functions, Details can be found in the Webuidelegate help documentation.

The above is a small set to introduce iOS development using UIWebView Shield alert warning box, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!