Extends NSdictionary with urlEncodedString

NSDictionary URL encoding extension

#import <Foundation/Foundation.h>

@interface NSDictionary (URLEncoding)

-(NSString*) urlEncodedString;

@end


// helper function: get the string form of any object
static NSString *toString(id object) {
    return [NSString stringWithFormat: @"%@", object];
}

// helper function: get the url encoded string form of any object
static NSString *urlEncode(id object) {
    NSString *string = toString(object);
    return [string stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
}

@implementation NSDictionary (URLEncoding)

-(NSString*) urlEncodedString {
    NSMutableArray *parts = [NSMutableArray array];
    for (id key in self) {
        id value = [self objectForKey: key];
        NSString *part = [NSString stringWithFormat: @"%@=%@", urlEncode(key), urlEncode(value)];
        [parts addObject: part];
    }
    return [parts componentsJoinedByString: @"&"];
}

@end