配列とループ処理を理解しよう：Cocoaの素、Objective-Cを知ろう（5）（3/4 ページ）

#import <Foundation/Foundation.h>
int main(void) {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  //（1）値, キー, 値, キー……で指定してディクショナリを生成
  NSDictionary *dict1 = [NSDictionary dictionaryWithObjectsAndKeys:
                         @"miro", @"name",
                         [NSNumber numberWithInt:8], @"age",
                         @"red" , @"color"
                         ,nil];
  //（2）値とキーを、それぞれ配列で指定してディクショナリを生成
  NSArray *keys = [NSArray arrayWithObjects:
                   @"name", @"age", @"color", nil];
  NSArray *vals = [NSArray arrayWithObjects:
                   @"futaba",
                   [NSNumber numberWithInt:4],
                   @"white", nil];
  NSDictionary *dict2 = [NSDictionary dictionaryWithObjects:vals forKeys:keys];
  //（3）キーを指定して要素を取得
  id obj1 = [dict1 objectForKey:@"name"];
  //（4）値とキーを、それぞれ配列として取得
  NSArray *kArr = [dict1 allKeys];
  NSArray *vArr = [dict1 allValues];
  //（5）ディクショナリの要素数を取得
  int dictCount = [dict1 count];
  //（6）ディクショナリの比較
  BOOL isDictEquals = [dict1 isEqualToDictionary:dict2];
  NSLog(@"%@", dict1);
  NSLog(@"%@", dict2);
  NSLog(@"%@", obj1);
  NSLog(@"%@", kArr);
  NSLog(@"%@", vArr);
  NSLog(@"%d", dictCount);
  NSLog(@"%d", isDictEquals);
  [pool drain];
  return 0;
}

#import <Foundation/Foundation.h>
int main(void) {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  //（1）空のディクショナリを生成
  NSMutableDictionary *mDict = [NSMutableDictionary dictionary];
  //（2）要素をセット
  [mDict setObject:@"miro" forKey:@"name"];
  [mDict setObject:[NSNumber numberWithInt:8] forKey:@"age"];
  [mDict setObject:@"red" forKey:@"color"];
  //（3）要素を削除
  [mDict removeObjectForKey:@"age"];
  [mDict removeObjectsForKeys:
    [NSArray arrayWithObjects:@"name", @"age", nil]];
  [mDict removeAllObjects];
  //（4）ディクショナリから要素を追加
  NSMutableDictionary *mDict2 =
    [NSMutableDictionary dictionaryWithObjectsAndKeys:
                       @"futaba", @"name",
                       [NSNumber numberWithInt:4], @"age",
                       @"white", @"color", nil];
  [mDict addEntriesFromDictionary:mDict2];
  NSLog(@"%@", mDict);
  [pool drain];
  return 0;
}