问题
Let's say I have an NSURL? Whether or not it already has an empty query string, how do I add one or more parameters to the query of the NSURL? I.e., does anyone know of an implementation of this function?
- (NSURL *)URLByAppendingQueryString:(NSString *)queryString
So that it satisfies this NSURL+AdditionsSpec.h file:
#import "NSURL+Additions.h"
#import "Kiwi.h"
SPEC_BEGIN(NSURL_AdditionsSpec)
describe(@"NSURL+Additions", ^{
__block NSURL *aURL;
beforeEach(^{
aURL = [[NSURL alloc] initWithString:@"http://www.example.com"];
aURLWithQuery = [[NSURL alloc] initWithString:@"http://www.example.com?key=value"];
});
afterEach(^{
[aURL release];
[aURLWithQuery release];
});
describe(@"-URLByAppendingQueryString:", ^{
it(@"adds to plain URL", ^{
[[[[aURL URLByAppendingQueryString:@"key=value&key2=value2"] query] should]
equal:@"key=value&key2=value2"];
});
it(@"appends to the existing query sting", ^{
[[[[aURLWithQuery URLByAppendingQueryString:@"key2=value2&key3=value3"] query] should]
equal:@"key=value&key2=value2&key3=value3"];
});
});
});
SPEC_END
回答1:
Since iOS 7 you can use NSURLComponents that is very simple to use. Take a look on these examples:
Example 1
NSString *urlString = @"https://mail.google.com/mail/u/0/?shva=1#inbox";
NSURLComponents *components = [[NSURLComponents alloc] initWithString:urlString];
NSLog(@"%@ - %@ - %@ - %@", components.scheme, components.host, components.query, components.fragment);
Example 2
NSString *urlString = @"https://mail.google.com/mail/u/0/?shva=1#inbox";
NSURLComponents *components = [[NSURLComponents alloc] initWithString:urlString];
if (components) {
//good URL
} else {
//bad URL
}
Example 3
NSURLComponents *components = [NSURLComponents new];
[components setScheme:@"https"];
[components setHost:@"mail.google.com"];
[components setQuery:@"shva=1"];
[components setFragment:@"inbox"];
[components setPath:@"/mail/u/0/"];
[self.webview loadRequest:[[NSURLRequest alloc] initWithURL:[components URL]]];
But you can do many other things with NSURLComponents take a look on NSURLComponents class reference on Apple documentation or on this link: http://nshipster.com/nsurl/
回答2:
Here's an implementation that passes your specs:
@implementation NSURL (Additions)
- (NSURL *)URLByAppendingQueryString:(NSString *)queryString {
if (![queryString length]) {
return self;
}
NSString *URLString = [[NSString alloc] initWithFormat:@"%@%@%@", [self absoluteString],
[self query] ? @"&" : @"?", queryString];
NSURL *theURL = [NSURL URLWithString:URLString];
[URLString release];
return theURL;
}
@end
And here is an implementation for NSString:
@implementation NSString (Additions)
- (NSURL *)URLByAppendingQueryString:(NSString *)queryString {
if (![queryString length]) {
return [NSURL URLWithString:self];
}
NSString *URLString = [[NSString alloc] initWithFormat:@"%@%@%@", self,
[self rangeOfString:@"?"].length > 0 ? @"&" : @"?", queryString];
NSURL *theURL = [NSURL URLWithString:URLString];
[URLString release];
return theURL;
}
// Or:
- (NSString *)URLStringByAppendingQueryString:(NSString *)queryString {
if (![queryString length]) {
return self;
}
return [NSString stringWithFormat:@"%@%@%@", self,
[self rangeOfString:@"?"].length > 0 ? @"&" : @"?", queryString];
}
@end
回答3:
The iOS8+ modern way
adding (or replacing 'ref' value if exists) ref=impm to url which is on min60.com
if ([[url host] hasSuffix:@"min60.com"]) {
NSURLComponents *components = [[NSURLComponents alloc] initWithURL:url resolvingAgainstBaseURL:NO];
NSURLQueryItem * newQueryItem = [[NSURLQueryItem alloc] initWithName:@"ref" value:@"impm"];
NSMutableArray * newQueryItems = [NSMutableArray arrayWithCapacity:[components.queryItems count] + 1];
for (NSURLQueryItem * qi in components.queryItems) {
if (![qi.name isEqual:newQueryItem.name]) {
[newQueryItems addObject:qi];
}
}
[newQueryItems addObject:newQueryItem];
[components setQueryItems:newQueryItems];
url = [components URL];
}
回答4:
Just a friendly post for those who don't want to write boilerplate code while building NSURL with NSURLComponents.
Since iOS8 we have NSURLQueryItem that helps building URL request freaking fast.
I wrote a little handy category to ease the work, that you can grab here: URLQueryBuilder
Here is example of how easy it is to work with it:
NSString *baseURL = @"https://google.com/search";
NSDictionary *items = @{
@"q" : @"arsenkin.com",
@"hl" : @"en_US",
@"lr" : @"lang_en"
};
NSURL *URL = [NSURL ars_queryWithString:baseURL queryElements:items];
// https://google.com/search?q=arsenkin.com&hl=en_US&lr=lang_en
回答5:
If you're using RestKit it provides additions to NSString. One of which is:
- (NSString *)stringByAppendingQueryParameters:(NSDictionary *)queryParameters
So you could do:
NSDictionary *shopParams = [NSDictionary dictionaryWithKeysAndObjects:
@"limit",@"20",
@"location",@"latitude,longitude",
nil];
NSString *pathWithQuery = [@"/api/v1/shops.json" stringByAppendingQueryParameters:shopParams]
回答6:
I have an extension to NSURLComponents that add query item, in swift:
extension NSURLComponents {
func appendQueryItem(name name: String, value: String) {
var queryItems: [NSURLQueryItem] = self.queryItems ?? [NSURLQueryItem]()
queryItems.append(NSURLQueryItem(name: name, value: value))
self.queryItems = queryItems
}
}
To use,
let components = NSURLComponents(string: urlString)!
components.appendQueryItem(name: "key", value: "value")
回答7:
The answers above mentioned the NSURLComponents,it's a good class to handle URL.
My answer is as follows:
Create a category with NSURL,like NSURL+Additions.h. Then,add the following method and implement it.
- (NSURL *)URLByAppendingQueryParameters:(NSDictionary *)queryParameters
{
if (queryParameters.count == 0) {
return self;
}
NSArray *queryKeys = [queryParameters allKeys];
NSURLComponents *components = [[NSURLComponents alloc] initWithURL:self resolvingAgainstBaseURL:NO];
NSMutableArray * newQueryItems = [NSMutableArray arrayWithCapacity:1];
for (NSURLQueryItem * item in components.queryItems) {
if (![queryKeys containsObject:item.name]) {
[newQueryItems addObject:item];
}
}
for (NSString *key in queryKeys) {
NSURLQueryItem * newQueryItem = [[NSURLQueryItem alloc] initWithName:key value:queryParameters[key]];
[newQueryItems addObject:newQueryItem];
}
[components setQueryItems:newQueryItems];
return [components URL];
}
回答8:
NSURL is not mutable so you cannot implement this functionality directly based on NSURL. Instead you will have to obtain the string representation of the URL, append your parameters to that and then create a new NSURL.
This does not sound like a good solution. Unless there is a good reason, it is better to work with strings until the last moment and only create an NSURL when you have your fully formed request.
来源：https://stackoverflow.com/questions/6309698/objective-c-how-to-add-query-parameter-to-nsurl