ios 获取 UIView 的当前角度/旋转/弧度？
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Get the current angle/rotation/radian for a UIView?
提问by Hjalmar
How do you get the current angle/rotation/radian a UIView has?
你如何获得 UIView 的当前角度/旋转/弧度？
回答by Krishnabhadra
You can do it this way...
你可以这样做...
CGFloat radians = atan2f(yourView.transform.b, yourView.transform.a);
CGFloat degrees = radians * (180 / M_PI);
回答by Peter Kreinz
Swift:
迅速：
// Note the type reference as Swift is now string Strict
let radians:Double = atan2( Double(yourView.transform.b), Double(yourView.transform.a))
let degrees:CGFloat = radians * (CGFloat(180) / CGFloat(M_PI) )
回答by Rakesh Yembaram
For Swift 3, you could use the following code:
对于 Swift 3，您可以使用以下代码：
let radians:Float = atan2f(Float(view.transform.b), Float(view.transform.a))
let degrees:Float = radians * Float(180 / M_PI)
回答by Dan Loewenherz
A lot of the other answers reference atan2f, but given that we're operating on CGFloats, we can just use atan2and skip the unnecessary intermediate cast:
很多其他答案都参考了atan2f，但是鉴于我们正在对CGFloats 进行操作，我们可以使用atan2并跳过不必要的中间转换：
Swift 4:
斯威夫特 4：
let radians = atan2(yourView.transform.b, yourView.transform.a)
let degrees = radians * 180 / .pi
回答by Rohit Sisodia
//For Swift 3: M_PI is depreciated now Use Double.pi
//对于 Swift 3: M_PI 现在折旧使用 Double.pi
let radians = atan2f(Float(yourView.transform.b), Float(yourView.transform.a));
let degrees = radians * Float(180 / Double.pi)
//For Swift 4:
//对于Swift 4：
let radians = atan2(yourView.transform.b, yourView.transform.a)
let degrees = radians * 180 / .pi
回答by Sujay U N
In swift 2 and Xcode 7 :
在 swift 2 和 Xcode 7 中：
let RdnVal = CGFloat(atan2f(Float(NamVyu.transform.b), Float(NamVyu.transform.a)))
let DgrVal = RdnVal * CGFloat(180 / M_PI)
