iOS：如何将UIViewAnimationCurve转换为UIViewAnimationOptions？

问题描述

UIKeyboardAnimationCurveUserInfoKey 有一个 UIViewAnimationCurve 值。如何将其转换为与选项参数 +相关的 UIViewAnimationOptions 值UIView.h

typedef枚举{
UIViewAnimationCurveEaseInOut，//开始和结束时缓慢
UIViewAnimationCurveEaseIn，//开始时缓慢
UIViewAnimationCurveEaseOut，//在结束时缓慢
UIViewAnimationCurveLinear
} UIViewAnimationCurve;

// ...

枚举{
// ...
UIViewAnimationOptionCurveEaseInOut = 0< 16，// default
UIViewAnimationOptionCurveEaseIn = 1<< 16，
UIViewAnimationOptionCurveEaseOut = 2<< 16，
UIViewAnimationOptionCurveLinear = 3< 16，
// ...
};
typedef NSUInteger UIViewAnimationOptions;


显然，我可以创建一个简单的类别方法，一个开关语句，如下所示：

  // UIView + AnimationOptionsWithCurve.h 
 
 @interface UIView（AnimationOptionsWithCurve）
 @end 
 
 // UIView + AnimationOptionsWithCurve.m 
 
 @implementation UIView（AnimationOptionsWithCurve）
 
 +（UIViewAnimationOptions ）animationOptionsWithCurve：（UIViewAnimationCurve）曲线{
 switch（curve）{
 case UIViewAnimationCurveEaseInOut：
 return UIViewAnimationOptionCurveEaseInOut; 
 case UIViewAnimationCurveEaseIn：
 return UIViewAnimationOptionCurveEaseIn; 
 case UIViewAnimationCurveEaseOut：
 return UIViewAnimationOptionCurveEaseOut; 
 case UIViewAnimationCurveLinear：
 return UIViewAnimationOptionCurveLinear; 
} 
} 
 
 @end 
  

但是有没有一个更简单/更好的方法？

解决方案

可以说你可以采取你的第一个解决方案，使它成为一个内联函数来保存自己堆栈推。这是一个紧凑的条件（常量等），它应该编译成一个很小的程序集。

编辑：
每个@matt，在这里你去（Objective-C）：

 静态内联UIViewAnimationOptions animationOptionsWithCurve（UIViewAnimationCurve曲线）
 {
开关（曲线）{
 case UIViewAnimationCurveEaseInOut：
 return UIViewAnimationOptionCurveEaseInOut; 
 case UIViewAnimationCurveEaseIn：
 return UIViewAnimationOptionCurveEaseIn; 
 case UIViewAnimationCurveEaseOut：
 return UIViewAnimationOptionCurveEaseOut; 
 case UIViewAnimationCurveLinear：
 return UIViewAnimationOptionCurveLinear; 
} 
} 
  

Swift 3：

 扩展UIViewAnimationOptions {
 init（曲线：UIViewAnimationCurve）{
开关曲线{
 case .easeIn：
 self = .curveEaseIn 
 case .easeOut：
 self = .curveEaseOut 
 case .easeInOut：
 self = .curveEaseInOut 
 case .linear：
 self =。 curveLinear 
} 
} 
} 
  

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 UIView (AnimationOptionsWithCurve)

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

@end

But, is there an even easier/better way?

解决方案

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
        }
    }
}

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