iOS: How to convert UIViewAnimationCurve to UIViewAnimationOptions?

Question

The `UIKeyboardAnimationCurveUserInfoKey` has a `UIViewAnimationCurve` value. How do I convert it to the corresponding `UIViewAnimationOptions` value for use with the `options` argument of `+[UIView animateWithDuration:delay:options:animations:completion:]`? ``` // UIView.h typedef enum { UIViewAnimationCurveEaseInOut, // slow at beginning and end UIViewAnimationCurveEaseIn, // slow at beginning UIViewAnimationCurveEaseOut, // slow at end UIViewAnimationCurveLinear } UIViewAnimationCurve; // ... enum { // ... UIViewAnimationOptionCurveEaseInOut = 0 << 16, // default UIViewAnimationOptionCurveEaseIn = 1 << 16, UIViewAnimationOptionCurveEaseOut = 2 << 16, UIViewAnimationOptionCurveLinear = 3 << 16, // ... }; typedef NSUInteger UIViewAnimationOptions; ``` Obviously, I could create a simple category method with a `switch` statement, like so: ``` // UIView+AnimationOptionsWithCurve.h @interface UIView (AnimationOptionsWithCurve) @end // UIView+AnimationOptionsWithCurve.m @implementation UI…

Accepted Answer

Arguably you can take your first solution and make it an inline function to save yourself the stack push. It's such a tight conditional (constant-bound, etc) that it should compile into a pretty tiny piece of assembly.

Edit: Per @matt, here you go (Objective-C):

```
static inline UIViewAnimationOptions animationOptionsWithCurve(UIViewAnimationCurve curve)
{
  switch (curve) {
    case UIViewAnimationCurveEaseInOut:
        return UIViewAnimationOptionCurveEaseInOut;
    case UIViewAnimationCurveEaseIn:
        return UIViewAnimationOptionCurveEaseIn;
    case UIViewAnimationCurveEaseOut:
        return UIViewAnimationOptionCurveEaseOut;
    case UIViewAnimationCurveLinear:
        return UIViewAnimationOptionCurveLinear;
  }
}
```

Swift 3:

```
extension UIViewAnimationOptions {
    init(curve: UIViewAnimationCurve) {
        switch curve {
            case .easeIn:
                self = .curveEaseIn
            case .easeOut:
                self = .curveEaseOut
            case .easeInOut:
                self = .curveEaseInOut
            case .linear:
                self = .curveLinear
        }
    }
}
```

iOS: How to convert UIViewAnimationCurve to UIViewAnimationOptions?

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