ios - 如何计算饼图顶部的旋转角度？
<p><p>当用户选择一个切片并让切片停止在轮子顶部时，我正在尝试旋转饼图轮</p>
<pre><code> // start from the middle of the slice angle
let startAngle = self.slicesArray.angle / 2
// end at top of chart
let endAngle = //?
let angleDifference = //?
UIView.animateWithDuration(0.4, animations: {
self.transform = CGAffineTransformRotate(self.transform, -angleDifference)
})
</code></pre>
<p> <a href="/image/WMveH.png" rel="noreferrer noopener nofollow"><img src="/image/WMveH.png" alt="enter image description here"/></a> </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>你试过用 3/2 π 作为 endAngle 吗？区别显然是 endAngle - startAngle</p></p>
<p style="font-size: 20px;">关于ios - 如何计算饼图顶部的旋转角度？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/41672047/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41672047/
</a>
</p>
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