blocks|key|1394030|text|如果您不想使用NSTimer，可以尝试手动运行NSRunLoop：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1394031|static+BOOL+shouldContinueGameLoop;
static+void+RunGameLoop()+{
++++NSRunLoop+*currentRunLoop+=+[NSRunLoop+currentRunLoop];
++++NSDate+*destDate+=+[[NSDate+alloc]+init];
++++do+{
++++++++//+Create+an+autorelease+pool
++++++++NSAutoreleasePool+*pool+=+[[NSAutoreleasePool+alloc]+init];
++++++++//+Run+the+runloop+to+process+OS+events
++++++++[currentRunLoop+runUntilDate:destDate];
++++++++//+Your+logic/draw+code+goes+here
++++++++//+Drain+the+pool
++++++++[pool+drain];
++++++++//+Calculate+the+new+date
++++++++NSDate+*newDate+=+[[NSDate+alloc]+initWithTimeInterval:1.0f/45+sinceDate:destDate];
++++++++[destDate+release];
++++++++destDate+=+newDate;
++++}+while(shouldContinueGameLoop);
++++[destDate+release];
}|code-block|syntax|javascript|1394032|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/iphone/library/documentation/cocoa/Reference/Foundation/Classes/NSRunLoop_Class/Reference/Reference.html^0|7|7|N|9|N|9|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If you don't wish to use <code>NSTimer</code> you can try running the <a href="http://developer.apple.com/iphone/library/documentation/cocoa/Reference/Foundation/Classes/NSRunLoop_Class/Reference/Reference.html" rel="nofollow noreferrer"><code>NSRunLoop</code></a> manually:

<pre><code>static BOOL shouldContinueGameLoop;
static void RunGameLoop() {
 NSRunLoop *currentRunLoop = [NSRunLoop currentRunLoop];
 NSDate *destDate = [[NSDate alloc] init];
 do {
 // Create an autorelease pool
 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 // Run the runloop to process OS events
 [currentRunLoop runUntilDate:destDate];
 // Your logic/draw code goes here
 // Drain the pool
 [pool drain];
 // Calculate the new date
 NSDate *newDate = [[NSDate alloc] initWithTimeInterval:1.0f/45 sinceDate:destDate];
 [destDate release];
 destDate = newDate;
 } while(shouldContinueGameLoop);
 [destDate release];
}
</code></pre>

blocks|key|4611053|text|API3.1的另一个选择是使用新的CADisplayLink+iPhoneOS。当需要更新屏幕内容时，这将调用您指定的选择器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611054|displayLink+=+[CADisplayLink+displayLinkWithTarget:self+selector:@selector(renderAndUpdate)];
[displayLink+setFrameInterval:2];
[displayLink+addToRunLoop:[NSRunLoop+currentRunLoop]+forMode:NSDefaultRunLoopMode];|code-block|syntax|javascript|4611055|如果您需要更多示例代码，XCode中的新OpenGL项目模板也会使用CADisplayLink。|4611056|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Another option with iPhoneOS 3.1 is to use the new CADisplayLink api. This will call the selector you specify when the screen contents needs to be updated.

<pre><code>displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(renderAndUpdate)];
[displayLink setFrameInterval:2];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
</code></pre>

The new OpenGL project template in XCode also use the CADisplayLink if you need some more example code.

blocks|key|1562429|text|虽然使用CADisplayLink对于基于3.1的游戏来说是一个非常好的选择，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1562430|任何使用“定时器”的东西都是一个非常糟糕的主意。|1562431|最好的方法是使用古老的“三重缓冲”来解耦GPU的工作。|1562432|Fabien在他的Doom+Iphone评论中有一个非常好的解释：|1562433|http://fabiensanglard.net/doomIphone/|offset|length|1562434|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|11|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@$J|X|K|Y|1|Z]]|A|$]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|I]]]]

While using CADisplayLink is a really good alternative for 3.1 based games, 
anything using "Timer" is a really bad idea.

The best approach is the good old "tripple buffering" to decouple the GPU work.

Fabien has a very good explanation in his Doom Iphone review: 
<a href="http://fabiensanglard.net/doomIphone/" rel="nofollow noreferrer">http://fabiensanglard.net/doomIphone/</a>

blocks|key|4611150|text|关于CADisplayLink和iPhone的末日文章，我给Fabien发了电子邮件，我认为最好的选择是主观的。性能方面的DisplayLink和三重缓冲应该是相同的，但DisplayLink仅在>OS3.1上可用。所以这应该是你的决定因素。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611151|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Regarding CADisplayLink and the Doom for iPhone article by Fabien, I emailed Fabien and I think the best option is subjective. Performance-wise DisplayLink and triple buffering should be the same, but DisplayLink is only available on > OS 3.1. So that should be your determining factor.

blocks|key|4611168|text|小心使用self作为displayLinkWithTarget的目标，手册上说“新构建的显示链接保留了目标”。马丁|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4611169|entityMap^0|4|4|A|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Take care using <code>self</code> as a target for <code>displayLinkWithTarget</code>, the manual says "The newly constructed display link retains the target".
Martin

In order to cleanly port my game to the iPhone, I'm trying to make a game loop that doesn't use NSTimer.

I noticed in some sample code that, if using NSTimer, you'd set it up at the beginning with something like

<pre><code> self.animationTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(drawView) userInfo:nil repeats:YES];
</code></pre>

where drawView would look something like:

<pre><code>
- (void)drawView 
{
 glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
 mFooModel->render();
 glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
 [context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
</code></pre>

When using this technique mFooModel renders fine, but I instead want to make my own game loop that calls drawView instead of having NSTimer call drawView 60 times a second. I would like something like:

<pre><code>
while(gGameState != kShutDown)
{
 [self drawView]
}
</code></pre>

Unfortunately when I do this, all I get is a black screen. Why does this happen? Is there anyway I can implement what I'm describing here?

The reason I want to avoid NSTimer is because I want to do physics and AI updates in the game loop. I use my own clock/timer to keep track of the amount of time that has elapsed so that I can do this accurately. Rendering happens as fast as possible. I try to use some of the techniques as described in <a href="http://dewitters.koonsolo.com/gameloop.html" rel="noreferrer">this article</a>

This is somewhat of an impulsive question (the one you do after you've been coding all day, get stuck, and hope the answer is there by morning)

Cheers guys.

How make a game loop on the iPhone without using NSTimer

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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为了干净利落地将我的游戏移植到iPhone上，我尝试创建一个不使用NSTimer的游戏循环。我在一些示例代码中注意到，如果使用NSTimer，则需要在开始时设置如下内容    self.animationTimer = [NSTimer scheduledTimerWithTimeInterval:animationI...

问如何在不使用NSTimer的情况下在iPhone上进行游戏循环
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问如何在不使用NSTimer的情况下在iPhone上进行游戏循环EN