Unity3d_UGUI加载场景进度条

项目之初，选用UGUI要做异步加载功能的loading界面。

当时UGUI相关的资源很少，多数都为NGUI的文章。

如果刚开始做异步加载，自己写的话会遇到bug，就是到了进度会卡在90%。当时有到外国的网站找解决方案，大多数都是到了90%后，继续人为加载。

不过后来有搜到下面这位大神的文章

原文：http://ez-dev.cn/?p=30

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ButtonMessage : MonoBehaviour {
    public Slider progress;
    public Text  progressValue;
    void Start() {
        progress.enabled = false;
        progress.gameObject.SetActive(false);
    }
    public void OnStartClick2() {
        Application.LoadLevel(1);
    }
    public void OnStartClick() {
        progress.gameObject.SetActive(true);
        StartCoroutine(LoadingScene(1));
    }
    private void setProgressValue(int value) {
        progress.value = value;
        progressValue.text = value + “%“;
    }
    private IEnumerator LoadingScene(int scene) {
        int displayProgress = 0;
        
        int toProgress = 0;
        
        AsyncOperation op = Application.LoadLevelAsync(scene);
        
        op.allowSceneActivation = false;
        
        while(op.progress < 0.9f) {
            
            toProgress = (int)op.progress * 100;
            
            while(displayProgress < toProgress) {
                
                ++displayProgress;
                
                setProgressValue(displayProgress);
                
                yield return new WaitForEndOfFrame();
                
            }
            
        }
        
        toProgress = 100;
        
        while(displayProgress < toProgress){
            
            ++displayProgress;
            
            setProgressValue(displayProgress);
            
            yield return new WaitForEndOfFrame();
            
        }
        
        op.allowSceneActivation = true;
    }
}

该脚本存在bug：

①在toProgress = (int)(op.progress * 100);要加一个括号，被这边坑了很久，否则会一直卡住

②AsyncOperation op要在协程意外定义，否则打包到安卓上会卡住

修改后的代码：

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ButtonMessage : MonoBehaviour {
    public Slider progress;
    public Text  progressValue;
    private AsyncOperation op;

    void Start() {
        op = Application.LoadLevelAsync("要跳转的关卡");
        StartCoroutine(LoadingScene());
    }
    
    private void setProgressValue(int value) {
        progress.value = value;
        progressValue.text = value + “%“;
    }
    private IEnumerator LoadingScene() {
        int displayProgress = 0;
        
        int toProgress = 0;
        
        op.allowSceneActivation = false;
        
        while(op.progress < 0.9f) {
            
            toProgress = (int)op.progress * 100;
            
            while(displayProgress < toProgress) {
                
                ++displayProgress;
                
                setProgressValue(displayProgress);
                
                yield return new WaitForEndOfFrame();
                
            }
            
        }
        
        toProgress = 100;
        
        while(displayProgress < toProgress){
            
            ++displayProgress;
            
            setProgressValue(displayProgress);
            
            yield return new WaitForEndOfFrame();
            
        }
        
        op.allowSceneActivation = true;
    }
}

关于UGUI加载场景进度条暂时就到这了，如果有什么不对或者遗漏的地方请指正！谢谢