Load Images Sequentially for Unity

ImagesLoader.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Load Images from start to end
public class ImagesLoader : MonoBehaviour {
    // index for images
    private int imageIndex=0;
    // number of images to load
    private int numberOfImages;
    private int unloadCounter;

    void Update() {
	resourcesUnloadIfNeeded();
    }

    private void resourcesUnloadIfNeeded() {
	if(unloadCounter > 5) {
	    unloadCounter = 0;
	    Resources.UnloadUnusedAssets();
	}
    }

    private WWW basicWWW (string loadPath) {
	// for iPad, iPhone
	return new WWW ("file://" + Application.streamingAssetsPath + "/" + loadPath);
    }

    private IEnumerator _loadPicture(GameObject obj, string name, float delay) {
	yield return new WaitForSeconds(delay);

	using (WWW www = basicWWW (name)) {
	    yield return www;
	    obj.GetComponent<Renderer> ().material.mainTexture = www.textureNonReadable;
	    obj.GetComponent<Renderer> ().enabled = true;
	}
    }

    // Load pictures sequentially (by auto)
    private IEnumerator _changePictures(GameObject obj, int numberOfImages, float interval) {
	for (int i=0; i<numberOfImages; i++) {
	    loadPicture(obj, i);
	    yield return new WaitForSeconds(interval);
	}
    }

    // Load picture and Set it to "obj"
    public void loadPicture(GameObject obj, float delay=0f) {
	if(imageIndex >= numberOfImages-1) return;

	string name = imageIndex.ToString("00") + ".jpg"; // name for images
	StartCoroutine(_loadPicture(obj, name, delay));

	// inc index for the next image to load
	imageIndex++;
	unloadCounter++;
    }
}