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Objective c synthesise

Objective c synthesise

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Objective c synthesise Essay

改めて説明するまでも無いかと思ってたけど意外と知らない人は知らないみたいので解説を書いておきます。

@property と @synthesize の組み合わせは端的に言うと「setterとgetter(アクセッサメソッド)をコンパイルの前に生成させる」以上。

※Objective-Cの場合、 @ objective chemical synthesise directive)と呼びます。

詳細説明

setterやgetterはメンバ変数を直接扱わずにメソッド経由で代入やデータの取得をする為に定義するメソッドです。setterがデータを代入する時のメソッド、getterがデータを取得する時のメソッドとなります。

メンバ変数をメソッド経由にすることにより代入前にチェックを行って有効な値のときのみメンバ変数に代入したり、そのメンバ変数の値が想定外の場合の値だった場合にその値が代入された箇所を簡単に特定でき、デバックが容易になったりする利点があります。

他の言語だと自分でそれぞれのメソッドを記述する必要が有ったりするものも有りますがObjective-Cでは @property と @synthesize objective k synthesise .h ファイルで以下の様に NSString *test_; とプロパティ宣言 @property (nonatomic, retain) IBOutlet NSString *test; が記述されていて

@interface TestAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; TestViewController *viewController; NSString *test_; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet TestViewController *viewController; @property (nonatomic, retain) IBOutlet NSString *test;

.m ファイルで以下の様に @synthesize が記述されていると

@synthesize test=test_;

以下の様なメソッドが自動的に追加されます。
※メソッドの内容は予想です。しかし、恐らくこれに近い内容だと思われます。

- (NSString*)test { return test_; } : (void)setTest:(NSString*)newTest { in cases where (test_ != newTest) { [test_ release]; test_ = [newTest retain]; } }

setter、getterが追加されている事を確認

setter、getterが追加されている事は以下の様なプログラムを作成し、 @synthesize test=test_; にブレークポイントを設定して実行すると確認出来ます。

- (BOOL)application:(UIApplication how towards make your bibliography mla component essay didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.test = @"test"; NSLog(@"%@ word.", self.test); [window addSubview:viewController.view]; [window makeKeyAndVisible]; returnYES; }


最初に以下の部分で呼ばれます。

self.test = @"test"; accuracy not to mention exquisitely detailed article format [TestAppDelegate application:didFinishLaunchingWithOptions:] essay noted presentation exercise [TestAppDelegate setTest:] が呼ばれているのが確認できるかと思います。

同様に以下の部分で止まった時に

NSLog(@"%@ word.", self.test);

スタックトレースを確認すると [TestAppDelegate application:didFinishLaunchingWithOptions:] から [TestAppDelegate test] が呼ばれているのが確認できるかと思います。

ちなみに以下の様な記述に変えるとプロパティ呼び出しでは無く、インスタンス変数へのアクセスとなるためブレークポイントで止まる事は無くなります。

NSLog(@"%@ word.", test_);

もちろん、同様に以下の記述でも止まりません。

NSLog(@"%@ word.", self->test_);

デフォルトのsetter、getterの定義を自分で実装する

コンパイラが作成するはずのsetter、getterと同じメソッド名のメソッドを記述する自分で実装を記述する事が可能です。以下の様に記述するとプロパティ(test)にアクセスした時にここで記述したメソッドが呼ばれます。

- (NSString*)testData { NSLog(@"testData"); returning test_; } : (void)setTestData:(NSString*)newTest { NSLog(@"setTestData"); test_ = newTest; }

setter、getterのメソッド名を自分の指定した名称にする。

ちなみに自身でsetter、getter定義する場合の名称は自分で指定する事も出来ます。
その場合、.h ファイルで以下の様にpropertyを宣言し、

@property (nonatomic, keep hold of, setter=setTestData, getter=testData) IBOutlet NSString *test;

.m ファイルに以下の様にsetter、getterを記述します。

- (NSString*)testData objective d synthesise NSLog(@"testData"); yield test_; } -- (void)setTestData:(NSString*)newTest { NSLog(@"setTestData"); test_ = newTest; }

今回のサンプルは3053;3061;3089;からDL出来ます。

  

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