how to get UIView 's angle after CGAffineTransform?

i have been do more CGAffineTransform.

how to get current Uiview's angle?

i want to d开发者_Python百科o something when angle==[M_PI/2 ~ M_PI]?

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CGFloat radians = atan2f(self.view.transform.b, self.view.transform.a); CGFloat degrees = radians * (180 / M_PI);

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You can check .transfrom property of UIView for that.