ios字符串中网址的方法（系统）

NSError* error =nil;

    NSDataDetector *dataDetector=[NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];

    NSArray *allMatches=[dataDetector matchesInString:attributeString.string options:NSMatchingReportProgress range:NSMakeRange(0, attributeString.string.length)];

    for(NSTextCheckingResult*matchinallMatches) {

        NSString*substrinsgForMatch2 = [attributeString.stringsubstringWithRange:match.range];

    }