展性及实用性上,建议大家统一使用cocos2d自身提供的schedule方法。下面就为大家深入浅出的介绍下schedule:
一、schedule 有三种不同的api:
1. scheduleUpdate():
2.scheduleOnce(callback,delay,key):
Parameters:
{function} callback
A function wrapped as a selector
{Number} delay
The amount of time that the first tick will wait before execution.
{String} key
The only string identifying the callback
3. schedule(callback,interval,repeat,key):
Parameters:
{function} callback
A function wrapped as a selector
{Number} interval
Tick interval in seconds. 0 means tick every frame. If interval = 0,it's recommended to use scheduleUpdate() instead.
{Number} repeat
The selector will be executed (repeat + 1) times,you can use kCCRepeatForever for tick infinitely.
{Number} delay
The amount of time that the first tick will wait before execution.
{String} key
The only string identifying the callback
二、schedule三种api的使用:
1. scheduleUpdate()
以layer为例,在初始化的时候(ctor函数return true 前,其他地方也可以,建议在初始化时)添加:
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- this.scheduleUpdate();
接着重写layer的update方法:(这里先定义了一个layer的成员变量time)
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- update:function(dt){
- this.time+=dt;
- if(this.time>=3){
- cc.log("每3秒在调试框中输出一次");
- this.time=0;
- };
- },
2.scheduleOnce(callback,key)
以layer为例,在初始化或其他非解析方法内添加:
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- this.scheduleOnce(this.once,2);
接着新建一个once的方法:
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- once:function(){
- cc.log("延迟2秒后,只执行一次");
- },
3.schedule(callback,key)
同样以layer为例,在初始化或其他非解析方法内添加:
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- bsp;this.schedule(this.notParameter,2,20,5);
接着新建一个notParameter的方法:
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- notParameter:function(){
- cc.log("不带参数的回调函数notParameter,延迟5秒后每2秒执行一次,累积执行20次");
- },
三、schedule的代码示例:
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- vartest=cc.Layer.extend({
- time:0,
- ctor:function(){
- this._super();
- this.time=0;
- this.scheduleUpdate();
- this.schedule(this.notParameter,5);
- this.schedule(functionnothing(){
- this.haveParameter("带参数")
- },1.5,10);
- this.schedule(this.notRepeat,5);
- this.scheduleOnce(this.once,2);
- returntrue;
- },
- notRepeat:function(){
- cc.log("每5秒执行一次");
- },
- notParameter:function(){
- cc.log("不带参数的回调函数notParameter,延迟5秒后每2秒执行一次,累积执行20次");
- },
- haveParameter:function(s){
- cc.log(s+"的回调函数haveParameter,每1.5秒执行一次,累积执行10次");
- },
- once:function(){
- cc.log("延迟2秒后,只执行一次");
- },
- update:function(dt){
- this.time+=dt;
- if(this.time>=3){
- cc.log("每3秒在调试框中输出一次");
- this.time=0;
- };
- },
- onExit:function(){
- this._super();
- this.unscheduleUpdate();
- this.unschedule(this.notRepeat);
- this.unscheduleAllCallbacks();
- }
- });
(编辑:李大同)
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