URL Validation (Objective-C)

问题

I am trying to validate a URL with this method:

Code:

- (BOOL) validateUrl: (NSString *) candidate {

    NSString *urlRegEx=
    @"((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:#@%/;$()~_?\+-=\\\.&]*)";

    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", urlRegEx]; 
    return [urlTest evaluateWithObject:candidate];

}

It does not function. I think the problem is with the regular expression.

回答1:

You can use + (id)URLWithString:(NSString *)URLString method of NSURL, which returns nil if the string is malformed.

Use if (URL && URL.scheme && URL.host) for checking URL.

回答2:

Try with this..

- (BOOL) validateUrl: (NSString *) candidate {
    NSString *urlRegEx =
    @"(http|https)://((\\w)*|([0-9]*)|([-|_])*)+([\\.|/]((\\w)*|([0-9]*)|([-|_])*))+";
    NSPredicate *urlTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", urlRegEx]; 
    return [urlTest evaluateWithObject:candidate];
}

it may help u out.

回答3:

NSString *urlRegEx = @"http(s)?://([\\w-]+\\.)+[\\w-]+(/[\\w- ./?%&=]*)?";

回答4:

What about using the following:

NSURL * url = [NSURL URLWithString:@"http://www.google.com"];

BOOL isValid = [UIApplication.sharedApplication canOpenURL:url];

note: best practice is to use regex

来源：https://stackoverflow.com/questions/8224568/url-validation-objective-c