解析NSURL mailto

Question

如何解析mailto请求？

'mailto:someone@example.com?cc=someone_else@example.com&subject=This%20is%20the%20subject&body=This%20is%20the%20body'

从这个NSURL,我想提取收件人,主题和身体.我应该怎么做 ？

谢谢

Answer 1

下面是一些代码,它将解析任何URL并返回带有参数和字典中相关对象的字典.它也适用于mailtoURL.
请注意:此代码假定您使用的是ARC!

@interface NSString (URLDecoding)  

- (NSString *) URLDecodedString;

@end

@implementation NSString (URLDecoding)

- (NSString *) URLDecodedString {
    NSString *result = (__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(kCFAllocatorDefault, (__bridge CFStringRef)self, CFSTR(""), kCFStringEncodingUTF8);
    return result;
}

@end

- (NSDictionary *) parameterDictionaryFromURL:(NSURL *)url {
    NSMutableDictionary *parameterDictionary = [[NSMutableDictionary alloc] init];
    if ([[url scheme] isEqualToString:@"mailto"]) {
        NSString *mailtoParameterString = [[url absoluteString] substringFromIndex:[@"mailto:" length]];
        NSUInteger questionMarkLocation = [mailtoParameterString rangeOfString:@"?"].location;
        [parameterDictionary setObject:[mailtoParameterString substringToIndex:questionMarkLocation] forKey:@"recipient"];

        if (questionMarkLocation != NSNotFound) {
            NSString *parameterString = [mailtoParameterString substringFromIndex:questionMarkLocation + 1];
            NSArray *keyValuePairs = [parameterString componentsSeparatedByString:@"&"];
            for (NSString *queryString in keyValuePairs) {
                NSArray *keyValuePair = [queryString componentsSeparatedByString:@"="];
                if (keyValuePair.count == 2)
                    [parameterDictionary setObject:[[keyValuePair objectAtIndex:1] URLDecodedString] forKey:[[keyValuePair objectAtIndex:0] URLDecodedString]];
            }
        }
    }
    else {
        NSString *parameterString = [url parameterString];
        NSArray *keyValuePairs = [parameterString componentsSeparatedByString:@"&"];
        for (NSString *queryString in keyValuePairs) {
            NSArray *keyValuePair = [queryString componentsSeparatedByString:@"="];
            if (keyValuePair.count == 2)
                [parameterDictionary setObject:[[keyValuePair objectAtIndex:1] URLDecodedString] forKey:[[keyValuePair objectAtIndex:0] URLDecodedString]];
        }
    }

    return [parameterDictionary copy];
}

以下是您如何使用它:

NSURL *mailtoURL = [NSURL URLWithString:@"mailto:foo@example.com?cc=bar@example.com&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!"];
NSDictionary *parameterDictionary = [self parameterDictionaryFromURL:mailtoURL];

NSString *recipient = [parameterDictionary objectForKey:@"recipient"];
NSString *subject = [parameterDictionary objectForKey:@"subject"];
NSString *body = [parameterDictionary objectForKey:@"body"];

编辑:
我更新了代码以使用任何URL,收件人现在在mailtoURL 的字典中.