AndroidのUri.BuilderみたいにNSURL作れるクラス

KKURLBuilder.h

//
// Created by kkgn06 on 2013/02/26.
//
// To change the template use AppCode | Preferences | File Templates.
//


#import <Foundation/Foundation.h>


@interface KKURLBuilder : NSObject
/**
* Constructor
*/
+ (id)urlBuilder;

/**
 * Sets the scheme.
 */
- (KKURLBuilder *)scheme:(NSString *)scheme;

/**
 * sets the authority.
 */
- (KKURLBuilder *)authority:(NSString *)authority;

/**
  * Sets the path.
  */
- (KKURLBuilder *)path:(NSString *)path;

/**
 * appends to the path.
 */
- (KKURLBuilder *)appendPath:(NSString *)newSegment;

/**
 * appends the parameter to the query string.
 */
- (KKURLBuilder *)appendQueryParameterKey:(NSString *)key value:(NSString *)value;

/**
 * Constructs a URL with the current attributes.
 */
- (NSURL *)buildURL;

@end

KKURLBuilder.m

//
// Created by kkgn06 on 2013/02/26.
//
// To change the template use AppCode | Preferences | File Templates.
//


#import "KKURLBuilder.h"

@interface KKURLBuilder ()
@property(nonatomic, strong) NSString *scheme;
@property(nonatomic, strong) NSString *authority;
@property(nonatomic, strong) NSMutableArray *pathArray;
@property(nonatomic, strong) NSMutableDictionary *params;
@end


@implementation KKURLBuilder {

}
// Constructor
+ (id)urlBuilder {
    return [[self alloc] init];
}

- (id)init {
    if (self = [super init]) {
        self.params = [NSMutableDictionary dictionary];
        self.pathArray = [NSMutableArray array];
    }
    return self;
}

// Sets the scheme.
- (KKURLBuilder *)scheme:(NSString *)scheme {
    self.scheme = scheme;
    return self;
}

// sets the authority.
- (KKURLBuilder *)authority:(NSString *)authority {
    self.authority = authority;
    return self;
}

// Sets the path.
- (KKURLBuilder *)path:(NSString *)path {
    self.pathArray = [NSMutableArray arrayWithObject:path];
    return self;
}

// appends to the path.
- (KKURLBuilder *)appendPath:(NSString *)newSegment {
    if ([newSegment hasPrefix:@"/"]) {
        newSegment = [newSegment substringWithRange:NSMakeRange(1, newSegment.length - 1)];
    }
    if ([newSegment hasSuffix:@"/"]) {
        newSegment = [newSegment substringWithRange:NSMakeRange(0, newSegment.length - 1)];
    }
    NSString *encodeSegment = [KKURLBuilder encode:newSegment];
    [self.pathArray addObject:encodeSegment];
    return self;
}

// appends the parameter to the query string.
- (KKURLBuilder *)appendQueryParameterKey:(NSString *)key value:(NSString *)value {
    [self.params setObject:value forKey:key];
    return self;
}

// Constructs a URL with the current attributes.
- (NSURL *)buildURL {
    NSMutableString *mutableString = [NSMutableString string];
    if (self.scheme) {
        [mutableString appendFormat:@"%@:", self.scheme];
    }
    if (self.authority) {
        NSString *encodeAuthority = [KKURLBuilder encode:self.authority];
        [mutableString appendFormat:@"//%@", encodeAuthority];
    }
    if ([self.pathArray count] > 0) {
        NSMutableArray *encodePathArray = [NSMutableArray array];
        for (NSString *p in self.pathArray) {
            NSString *encodePath = [KKURLBuilder encode:p];
            [encodePathArray addObject:encodePath];
        }
        NSString *path = [encodePathArray componentsJoinedByString:@"/"];

        [mutableString appendFormat:@"/%@", path];
    }
    if ([self.params count] > 0) {
        NSString *query = [self buildQuery];
        [mutableString appendFormat:@"?%@", query];
    }
    return [NSURL URLWithString:mutableString];
}

// Constructs a query with the current attributes.
- (NSString *)buildQuery {
    NSMutableString *query = [NSMutableString string];
    for (NSString *key in self.params) {
        NSString *value = [self.params objectForKey:key];
        [query appendFormat:@"&%@=%@",
                            [KKURLBuilder encode:key],
                            [KKURLBuilder encode:value]];
    }
    // Remove the "&" at the beginning
    if ([query hasPrefix:@"&"]) {
        [query deleteCharactersInRange:NSMakeRange(0, 1)];
    }

    return [NSString stringWithString:query];
}

+ (NSString *)encode:(NSString *)plainString {
    NSString *legalURLCharactersToBeEscaped = @"!*'();:@&=+$,/?%#[]";
    return (__bridge_transfer NSString *) CFURLCreateStringByAddingPercentEscapes(NULL,
            (__bridge CFStringRef) plainString,
            NULL,
            (__bridge CFStringRef) legalURLCharactersToBeEscaped,
            kCFStringEncodingUTF8);
}

+ (NSString *)decode:(NSString *)escapedUrlString {
    NSString *charsToLeaveEscaped = @"";
    return (__bridge_transfer NSString *) CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,
            (__bridge CFStringRef) escapedUrlString,
            (__bridge CFStringRef) charsToLeaveEscaped,
            kCFStringEncodingUTF8);
}

@end