blocks|key|5327597|text|我从来没有尝试过，但是查看文档应该是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5327598|UIScreen+*mainScreen+=+[UIScreen+mainScreen];
mainScreen.brightness+=+.5;+//should+set+the+brightness+at+50%25|code-block|syntax|javascript|5327599|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have never tried it, but looking at the docs it should go like this:

<pre><code>UIScreen *mainScreen = [UIScreen mainScreen];
mainScreen.brightness = .5; //should set the brightness at 50%
</code></pre>

blocks|key|5042732|text|您可以使用这两项中的任何一项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5042733|5042734|[[UIScreen+mainScreen]setBrightness:1.0];|ordered-list-item|offset|length|style|CODE|5042735|GSEventSetBacklightLevel(0.5f);但这是一个私有接口调用，如果您使用它，您的应用程序肯定会被拒绝。|5042736|5042737|entityMap^0|0|0|0|15|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Q|8|@$F|R|G|S|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|T|8|@$F|U|G|V|H|I]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

You can use either of these two:

<ol>
<li><code>[[UIScreen mainScreen]setBrightness:1.0];</code></li>
<li><code>GSEventSetBacklightLevel(0.5f);</code> But this is a private API call, if you use it, your application will surely be rejected.</li>
</ol>

blocks|key|3429325|text|UIScreen类有一个新的property+called+brightness。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3429326|此外，还有一个名为wantsSoftwareDimming的属性(当设置为YES时)允许你低于硬件支持的最低亮度，因为一个特殊的“调光视图”覆盖在屏幕上，使物体变得更暗。|3429327|brightness属性接受从0到1的浮点数。所以：|3429328|3429329|的wantsSoftwareDimming设置为NO+(默认值)，brightness为0表示“硬件支持的最暗”，brightness为1表示“硬件支持的最亮的硬件wantsSoftwareDimming设置为YES，0的brightness表示”硬件支持的最暗的硬件加上叠加调暗视图而变暗“，1的brightness仍然表示”硬件支持的最亮的硬件“。|unordered-list-item|3429330|3429331|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/IOs/documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html#//apple_ref/occ/instp/UIScreen/brightness^0|0|8|U|A|E|Q|0|0|9|K|11|3|0|0|A|F|1|H|1|0|0|1|K|O|2|X|A|18|1|1L|A|1W|1|2A|K|2X|3|31|1|33|A|43|1|45|A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|19|8|@$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|C]|$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]|$9|20|A|21|B|C]|$9|22|A|23|B|C]|$9|24|A|25|B|C]]|D|@]|E|$]]|$1|N|3|-4|5|6|7|26|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|27|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

The <code>UIScreen</code> class has a new <a href="http://developer.apple.com/library/IOs/documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html#//apple_ref/occ/instp/UIScreen/brightness">property called <code>brightness</code></a>.

In addition, there's another property called <code>wantsSoftwareDimming</code> that (when set to <code>YES</code>) allows you to go below the lowest brightness supported by the hardware, because a special "dimming view" is overlaid over the screen to darken things even further.

The <code>brightness</code> property takes a float from <code>0</code> to <code>1</code>. So:

<ul>
<li>with <code>wantsSoftwareDimming</code> set to <code>NO</code> (the default), a <code>brightness</code> of <code>0</code> means "the darkest the hardware supports" and a <code>brightness</code> of <code>1</code> means "the brightest the hardware supports".</li>
<li>with <code>wantsSoftwareDimming</code> set to <code>YES</code>, a <code>brightness</code> of <code>0</code> means "the darkest the hardware supports PLUS darkening by overlaying a dimming view", and a <code>brightness</code> of <code>1</code> still means "the brightest the hardware supports".</li>
</ul>

blocks|key|5042851|text|正如其他人所指出的，您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5042852|[[UIScreen+mainScreen]+setBrightness:1.0];|code-block|syntax|javascript|5042853|，但是，要非常小心，因为你会遇到问题(从这里的经验来看)，看看这个：IOS5+setBrightness+didn't+work+with+applicationWillResignActive和这个：Anyone+been+able+to+use+[[UIScreen+mainScreen]+setBrightness]+on+background+/+exit?|offset|length|style|BOLD|5042854|(当我发现这个帖子/答案时，我希望我有)+:-(|5042855|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/8280734/ios5-setbrightness-didnt-work-with-applicationwillresignactive|1|https://stackoverflow.com/questions/10997375/anyone-been-able-to-use-uiscreen-mainscreen-setbrightness-on-background-ex^0|0|0|0|3|Y|1R|0|2T|2B|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@$I|13|J|14|1|15]|$I|16|J|17|1|18]]|A|$]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]]]

As others pointed out you can use 

<pre><code>[[UIScreen mainScreen] setBrightness:1.0];
</code></pre>

BUT be very careful because you will run into problems (talking from experience here)
look at this: 
<a href="https://stackoverflow.com/questions/8280734/ios5-setbrightness-didnt-work-with-applicationwillresignactive">IOS5 setBrightness didn&#39;t work with applicationWillResignActive</a>
and this:
<a href="https://stackoverflow.com/questions/10997375/anyone-been-able-to-use-uiscreen-mainscreen-setbrightness-on-background-ex">Anyone been able to use [[UIScreen mainScreen] setBrightness] on background / exit?</a>

(I wish I had, when I discovered this thread/answer) :-(

How would I program the ability to change brightness in-app? I know that its possible as I have seen at least three apps that can do it. This would be very useful for my app. I know that it's only possible in iOS 5 with the UIScreen Class, but I have no idea how to program it. Please help me!

How to change brightness in iOS 5 app?

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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我如何编程才能在应用程序中改变亮度？我知道这是可能的，因为我已经看到至少有三个应用程序可以做到这一点。这对我的应用程序非常有用。我知道只有在带有UIScreen类的iOS 5中才能实现，但我不知道如何对其进行编程。请帮帮我!

问如何在iOS 5应用中更改亮度？
EN

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问如何在iOS 5应用中更改亮度？EN