有时我们想要在一些按钮或鼠标事件之后在让OnGUI画出里面的东西、

bool down = false;
void OnGUI()
{
  if (down)
      GUILayout.Label("had mouse down");
 
  if (Event.current.type == EventType.MouseDown)
      down = true;
}

参考：http://forum.unity3d.com/threads/29058-error-with-no-side-effects

package com.okhiking;


import java.io.BufferedReader;
import java.io.InputStreamReader;


import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;


import android.content.Context;
import android.util.Log;


import com.okhiking.SLocation.SCell;
import com.okhiking.SLocation.SItude;


public class LocationUtil {
	public static String getLocation(Double lat ,Double lon) throws Exception {
		String resultString = "";
		/** 这里采用get方法，直接将参数加到URL上 */
		String urlString = String.format(
				"http://maps.google.com/maps/geo?key=abcdefg&q=%s,%s",
				lat, lon);
		Log.i("URL", urlString);


		/** 新建HttpClient */
		HttpClient client = new DefaultHttpClient();
		/** 采用GET方法 */
		HttpGet get = new HttpGet(urlString);
		try {
			/** 发起GET请求并获得返回数据 */
			HttpResponse response = client.execute(get);
			HttpEntity entity = response.getEntity();
			BufferedReader buffReader = new BufferedReader(
					new InputStreamReader(entity.getContent()));
			StringBuffer strBuff = new StringBuffer();
			String result = null;
			while ((result = buffReader.readLine()) != null) {
				strBuff.append(result);
			}
			resultString = strBuff.toString();


			/** 解析JSON数据，获得物理地址 */
			if (resultString != null && resultString.length() > 0) {
				JSONObject jsonobject = new JSONObject(resultString);
				JSONArray jsonArray = new JSONArray(jsonobject.get("Placemark")
						.toString());
				resultString = "";
				for (int i = 0; i < jsonArray.length(); i++) {
					resultString = jsonArray.getJSONObject(i).getString(
							"address");
				}
			}
		} catch (Exception e) {
			throw new Exception("获取物理位置出现错误:" + e.getMessage());
		} finally {
			get.abort();
			client = null;
		}


		return resultString;
	}


}

阅读别人代码的时候，经常会在delloc方法中，看到有的人释放对象使用self.xxx=nil,有些人使用[xxx release];就忍不住想查看一下这两者的区别；

搜索资料之后，看到网上找到如下说法：

self.xxx = nil;等价于[xxx release];  xxx = [nil retain];

所以以后在delloc方法中，还是尽量用self.xxx = nil吧