blocks|key|994973|text|选项一是最简单的。请记住，您可以合成图像的一部分，以处理包装。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|994974|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|$]]

Option one is the easiest. Keep in mind that you can composite part of an image to deal with the wrap-around.

blocks|key|2085823|text|您可以构建标题的模块10，并为10、5和所有其他部分切换。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2085824|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|$]]

You can build the modulo 10 of the heading and switch for 10, 5 and all others.

blocks|key|994994|text|您只需要实现位置管理器功能，就可以找到iPhone所指向的确切方向。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|994995|所以，你可以检查这个：|994996|CLLocationManager+*locationManager;
[locationManager+startUpdatingHeading];|code-block|syntax|javascript|994997|当您调用startUpdatingHeading()时，它将调用"-+(void)locationManager:(CLLocationManager+*)manager+didUpdateHeading:(CLHeading+*)newHeading“方法，需要从位置管理器重写该方法。|offset|length|style|CODE|994998|这就是你可以找到的方向，iPhone+3GS是指向newHeading.magneticHeading或newHeading.trueHeading。|994999|你会惊讶于你能得到同样的方向，就像磁罗盘给你的一样。|995000|entityMap^0|0|0|0|X|2L|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

You just need to implement location manager functionality to find the exact direction in which your iPhone is pointing. 

So, You can check this : 

<pre><code>CLLocationManager *locationManager;
[locationManager startUpdatingHeading];
</code></pre>

And whenever you call startUpdatingHeading() it will call 
"<code>- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading</code>" method which you need to override from Location manager. 

And that's it you can find the direction in which iPhone 3GS is pointing by newHeading.magneticHeading or newHeading.trueHeading. 

You will surprise that you can get exact the same direction what magnetic compass gives you.

blocks|key|997419|text|以下是在iPhone+4中实现水平罗盘的完整解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|997420|if+([CLLocationManager+locationServicesEnabled]+&&+[CLLocationManager+headingAvailable])+
++++{
++++++++m_locationManager=[[CLLocationManager+alloc]init];
++++++++m_locationManager.desiredAccuracy=kCLLocationAccuracyBest;
++++++++m_locationManager.headingOrientation=CLDeviceOrientationPortrait;;
++++++++m_locationManager.delegate=self;
++++++++[m_locationManager+startUpdatingHeading];

++++}|code-block|syntax|javascript|997421|pragma标记CLLocationManagerDelegate方法|997422|-+(void)locationManager:(CLLocationManager+*)manager+didUpdateHeading:(CLHeading+*)newHeading
{
++++CLLocationDirection+direction=+newHeading.magneticHeading;
++++[m_readingsLabel+setText:[NSString+stringWithFormat:@"Degrees:%25f",direction]];

++++float+radians=direction*M_PI/180;
++++m_compassImageView.transform=CGAffineTransformMakeRotation(radians);
}|997423|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a complete solution of implementing horizontal compass in iPhone 4

<pre><code>if ([CLLocationManager locationServicesEnabled] &amp;&amp; [CLLocationManager headingAvailable]) 
 {
 m_locationManager=[[CLLocationManager alloc]init];
 m_locationManager.desiredAccuracy=kCLLocationAccuracyBest;
 m_locationManager.headingOrientation=CLDeviceOrientationPortrait;;
 m_locationManager.delegate=self;
 [m_locationManager startUpdatingHeading];

 }
</code></pre>

<h1>pragma mark CLLocationManagerDelegate Methods</h1>

<pre><code>- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
 CLLocationDirection direction= newHeading.magneticHeading;
 [m_readingsLabel setText:[NSString stringWithFormat:@"Degrees:%f",direction]];

 float radians=direction*M_PI/180;
 m_compassImageView.transform=CGAffineTransformMakeRotation(radians);
}
</code></pre>

A horizontal compass looks something like this if you are facing due East (90 degrees).

<pre><code>85----90---95
</code></pre>

If you were facing due 355 degrees northwest, it would look like this:

<pre><code>350----355---0
</code></pre>

As you turn the compass, the number should cycle from 0 -> 360 -> 0

So, my question is, how would you implement a view like this on the iPhone? I had a couple of ideas:

<ol>
<li>Make one long image with all numbers
and tick marks, and shift it
left/right when the compass heading
changes</li>
<li>Create pieces of the view as tiles
and append them when the compass
heading changes.</li>
<li>Create a line of tick marks that
shifts with the compass heading, and
just write numbers on it as needed.</li>
</ol>

How would you attack this problem? Im mainly looking for algorithmic advice, but if you ave code or pseudo-code to demonstrate, that would be helpful too.

Implementing a horizontal compass on the iPhone - algorithm?

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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如果你正朝东(90度)，水平罗盘看起来就像这样。85----90---95如果你正面临西北方向355度的问题，它应该是这样的：350----355---0当你转动指南针时，这个数字应该从0 -> 360 -> 0开始循环。所以，我的问题是，您将如何在iPhone上实现这样的视图？我有几个想法：用所有的数字和勾标制作一个...

问在iPhone算法上实现水平罗盘？
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