主文

構造体は値型だから値が変わらないと変化にならないよ気をつけようね

構造体

public struct TestStruct {
	public int amount;
	public bool flag;
}

例１

以下のコードは１秒毎にStruct has been changedが出力される（厳密には1/200の確率で）
構造体の値が変わるから当然


ReactiveProperty<TestStruct> teststruct = new ReactiveProperty<TestStruct>(new TestStruct());

void Start () {

		teststruct.Subscribe(_=>{
			Debug.Log("Struct has been changed.");
		});

		Observable.Interval(System.TimeSpan.FromSeconds(1f)).Subscribe(_=> {
			var s = teststruct.Value;
			s.amount = Random.Range(1,100);
			s.flag = Random.Range(0,2) == 0;
			teststruct.Value = s;
		});
}

例２

これも１秒毎にStruct has been changedが出力される（厳密には1/200の確率で）
構造体の値が変わるから当然


ReactiveProperty<TestStruct> teststruct = new ReactiveProperty<TestStruct>(new TestStruct());

void Start () {

		teststruct.Subscribe(_=>{
			Debug.Log("Struct has been changed.");
		});

		Observable.Interval(System.TimeSpan.FromSeconds(1f)).Subscribe(_=> {
			teststruct.Value = new TestStruct(){
				amount = Random.Range(1,100),
				flag = Random.Range(0,2) == 0
			};
		});
}

例３

この場合は１回しか出ない（初期値の代入時のみ）
初期値が1,falseで、毎回更新のたびに1,falseのものを入れてるから変化がないとの判断


ReactiveProperty<TestStruct> teststruct = new ReactiveProperty<TestStruct>(new TestStruct(){amount = 1, flag = false});

void Start () {

		teststruct.Subscribe(_=>{
			Debug.Log("Struct has been changed.");
		});

		Observable.Interval(System.TimeSpan.FromSeconds(1f)).Subscribe(_=> {
			var s = teststruct.Value;
			s.amount = 1;
			s.flag = false;
			teststruct.Value = s;
		});
}

例４

これも１回しか出ない
値が変わらないとOnNextが送られない


ReactiveProperty<TestStruct> teststruct = new ReactiveProperty<TestStruct>(new TestStruct(){amount = 1, flag = false});

void Start () {

		teststruct.Subscribe(_=>{
			Debug.Log("Struct has been changed.");
		});

		Observable.Interval(System.TimeSpan.FromSeconds(1f)).Subscribe(_=> {
			teststruct.Value = new TestStruct(){amount = 1, flag = false};
		});
}

値が変わらなくても必ず通知して欲しい

ReactiveProperty.SetValueAndForceNotifyを使えば良い


ReactiveProperty<TestStruct> teststruct = new ReactiveProperty<TestStruct>(new TestStruct(){amount = 1, flag = false});

void Start () {

		teststruct.Subscribe(_=>{
			Debug.Log("Struct has been changed.");
		});

		Observable.Interval(System.TimeSpan.FromSeconds(1f)).Subscribe(_=> {
			teststruct.SetValueAndForceNotify(new TestStruct(){amount = 1, flag = false} );
		});
}