/// <summary>
/// 場(chǎng)景切換
/// 在unity 獲取當(dāng)前加載進(jìn)度progress中，其中最多到0.9.只有等到加載到第二個(gè)場(chǎng)景才會(huì)到1
/// 所有在加載進(jìn)度條時(shí)如果progress的值近似0.9，則直接將進(jìn)度參數(shù)設(shè)置為1，實(shí)現(xiàn)進(jìn)度到100%
/// 并且progress的值是在一幀加載一些資源，所以其值不會(huì)是連續(xù)的，因此設(shè)置兩個(gè)參數(shù)來記錄當(dāng)前
/// 進(jìn)度和頁(yè)面顯示的進(jìn)度，進(jìn)行++。
/// </summary>
public class loadScene : MonoBehaviour
{
 AsyncOperation async;
 public Slider slider;
 public Text text;//百分制顯示進(jìn)度加載情況

 void Start()
 {
 //開啟協(xié)程
 StartCoroutine("loginMy");
 }
 
 void Update()
 {
 
 }
 IEnumerator loginMy()
 {
 int displayProgress = 0;
 int toProgress = 0;
 AsyncOperation op = SceneManager.LoadSceneAsync(1);
 op.allowSceneActivation = false;
 while (op.progress < 0.9f) //此處如果是 <= 0.9f 則會(huì)出現(xiàn)死循環(huán)所以必須小0.9
 {
  toProgress = (int)op.progress * 100;
  while (displayProgress < toProgress)
  {
  ++displayProgress;
  SetLoadingPercentage(displayProgress);
  yield return new WaitForEndOfFrame();//ui渲染完成之后
  }
 }
 toProgress = 100;
 while (displayProgress < toProgress)
 {
  ++displayProgress;
  SetLoadingPercentage(displayProgress);
  yield return new WaitForEndOfFrame();
 }
 op.allowSceneActivation = true;

 }

 private void SetLoadingPercentage(int displayProgress)
 {
 slider.value = displayProgress;
 text.text = displayProgress.ToString() + "%";
 }
}