iOS开发之SceneKit框架--SCNAction.h

1、SCNAction简介

　　主要负责节点SCNNode的属性，实现node的渐变、移动、出现、消失、实现动画等。

2、相关API

• 节点的移动（earthNode的初始坐标（5，0，0））

//从当前位置移动指定的距离X轴：deltaX Y轴：deltaY Z轴：deltaZ
+ (SCNAction *)moveByX:(CGFloat)deltaX y:(CGFloat)deltaY z:(CGFloat)deltaZ duration:(NSTimeInterval)duration;
+ (SCNAction *)moveBy:(SCNVector3)delta duration:(NSTimeInterval)duration;

    [self.earthNode runAction:[SCNAction moveByX:5 y:5 z:0 duration:1]];
    [self.earthNode runAction:[SCNAction moveBy:SCNVector3Make(5, 5, 0) duration:1]]; 

//移动到指定坐标location
+ (SCNAction *)moveTo:(SCNVector3)location duration:(NSTimeInterval)duration;

    [self.earthNode runAction:[SCNAction moveTo:SCNVector3Make(5, 5, 0) duration:1]];

• 节点的旋转

//当前的节点基础上进行旋转指定的角度X轴：xAngle Y轴：yAngle Z轴：zAngle
+ (SCNAction *)rotateByX:(CGFloat)xAngle y:(CGFloat)yAngle z:(CGFloat)zAngle duration:(NSTimeInterval)duration;

//旋转到指定的角度X轴：xAngle Y轴：yAngle Z轴：zAngle
//shortestUnitArc：YES是顺时针，NO为逆时针
+ (SCNAction *)rotateToX:(CGFloat)xAngle y:(CGFloat)yAngle z:(CGFloat)zAngle duration:(NSTimeInterval)duration;
+ (SCNAction *)rotateToX:(CGFloat)xAngle y:(CGFloat)yAngle z:(CGFloat)zAngle duration:(NSTimeInterval)duration shortestUnitArc:(BOOL)shortestUnitArc;

    [self.earthNode runAction:[SCNAction rotateByX:0 y:M_PI_2 z:0 duration:4]];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.earthNode runAction:[SCNAction rotateToX:0 y:0 z:0 duration:4]];
    });

//axis和原点组成轴向量，旋转angle角度
//axisAngle：是四分量，前三个坐标相当于axis的值，第四个值为旋转角度
+ (SCNAction *)rotateByAngle:(CGFloat)angle aroundAxis:(SCNVector3)axis duration:(NSTimeInterval)duration;
+ (SCNAction *)rotateToAxisAngle:(SCNVector4)axisAngle duration:(NSTimeInterval)duration;

    [self.earthNode runAction:[SCNAction rotateByAngle:M_PI_2 aroundAxis:SCNVector3Make(5, 5, 0) duration:4]];

    [self.earthNode runAction:[SCNAction rotateToAxisAngle:SCNVector4Make(5, 5, 0, M_PI_2) duration:4]];

•  节点的缩放

//在原来基础上进行缩放
+ (SCNAction *)scaleBy:(CGFloat)scale duration:(NSTimeInterval)sec;
//在初始化的基础上进行缩放
+ (SCNAction *)scaleTo:(CGFloat)scale duration:(NSTimeInterval)sec;

    [self.earthNode runAction:[SCNAction scaleTo:2 duration:2]];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.earthNode runAction:[SCNAction scaleBy:0.5 duration:2]];
    });

    [self.earthNode runAction:[SCNAction scaleBy:2 duration:2]];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.earthNode runAction:[SCNAction scaleTo:0.5 duration:2]];
    });

• 节点的透明度

//透明度变换到1的动画
+ (SCNAction *)fadeInWithDuration:(NSTimeInterval)sec;
//透明度变换到0的动画
+ (SCNAction *)fadeOutWithDuration:(NSTimeInterval)sec;
//原来的透明度基础上 变换值为factor
+ (SCNAction *)fadeOpacityBy:(CGFloat)factor duration:(NSTimeInterval)sec;
//变换到指定的透明度opacity
+ (SCNAction *)fadeOpacityTo:(CGFloat)opacity duration:(NSTimeInterval)sec;

    [self.earthNode runAction:[SCNAction fadeOutWithDuration:4]];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.earthNode runAction:[SCNAction fadeInWithDuration:2]];
    });

• 节点的可视性

//隐藏node
+ (SCNAction *)hide API_AVAILABLE(macos(10.11), ios(9.0));
//不隐藏node
+ (SCNAction *)unhide API_AVAILABLE(macos(10.11), ios(9.0));

• 移除节点 

//移除节点
+ (SCNAction *)removeFromParentNode;

• 添加音频播放

//播放音频。 waitForCompletion：YES Action的duration就是音频的时长；NO duration为0。
+ (SCNAction *)playAudioSource:(SCNAudioSource *)source waitForCompletion:(BOOL)wait API_AVAILABLE(macos(10.11), ios(9.0));

• 创建节点的动画组或者重复节点的动画

//所有动画串行运行
+ (SCNAction *)sequence:(NSArray<SCNAction *> *)actions;
//所有动画并行运行
+ (SCNAction *)group:(NSArray<SCNAction *> *)actions;

//重复action动画，count次
+ (SCNAction *)repeatAction:(SCNAction *)action count:(NSUInteger)count;
//一直重复action动画
+ (SCNAction *)repeatActionForever:(SCNAction *)action;

    [self.earthNode runAction:[SCNAction group:@[[SCNAction rotateToX:5 y:5 z:0 duration:2],[SCNAction fadeOutWithDuration:2]]]];

    [self.earthNode runAction:[SCNAction sequence:@[[SCNAction rotateToX:5 y:5 z:0 duration:2],[SCNAction fadeOutWithDuration:2]]]];

• 动画延迟设置（适用于//所有动画串行运行+ (SCNAction *)sequence:(NSArray<SCNAction *> *)actions;）

//动画延迟时间
+ (SCNAction *)waitForDuration:(NSTimeInterval)sec;
//动画延迟时间 随机数范围【sec，durationRange/2]
+ (SCNAction *)waitForDuration:(NSTimeInterval)sec withRange:(NSTimeInterval)durationRange;

    [self.earthNode runAction:[SCNAction sequence:@[[SCNAction rotateToX:5 y:5 z:0 duration:2],[SCNAction waitForDuration:2 withRange:6],[SCNAction fadeOutWithDuration:2]]]];

• 节点自定义动画

//执行动画开始时立即调用，node是正在动画的节点
+ (SCNAction *)runBlock:(void (^)(SCNNode *node))block;
+ (SCNAction *)runBlock:(void (^)(SCNNode *node))block queue:(dispatch_queue_t)queue;

/**
 反复运行脚本，直到动作的持续时间结束。每次SceneKit运行脚本时，它计算自操作开始执行以来的运行时间(作为操作在0.0到1.0之间的时间的一部分)，并使脚本作为一个名为elapsedTime的变量可用。

 @param script 包含JavaScript源代码的字符串。
 @param seconds 动作的持续时间，以秒为单位。
 */
+ (SCNAction *)javaScriptActionWithScript:(NSString *)script duration:(NSTimeInterval)seconds;

/**
 自定义动作执行时反复调用

 @param seconds 动作时间
 @param block 节点node，和动作开始经过的时间elapsedTime
 */
+ (SCNAction *)customActionWithDuration:(NSTimeInterval)seconds actionBlock:(void (^)(SCNNode *node, CGFloat elapsedTime))block;

• 节点动画逆转

- (SCNAction *)reversedAction;

• 基础属性

//动画时间
@property(nonatomic) NSTimeInterval duration;
//定时模式
@property(nonatomic) SCNActionTimingMode timingMode;

typedef NS_ENUM(NSInteger, SCNActionTimingMode) {
    SCNActionTimingModeLinear,//匀速
    SCNActionTimingModeEaseIn,//先慢后快
    SCNActionTimingModeEaseOut,//先快后慢
    SCNActionTimingModeEaseInEaseOut//先慢中快后慢
} API_AVAILABLE(macos(10.10), ios(8.0));

//使用这个输入来计算定制的计时功能，它的输出决定了动画的计时
@property(nonatomic, nullable) SCNActionTimingFunction timingFunction;
//自定义计时功能。输入时间在0.0到1.0之间。在行动期间。返回值必须为0-1.0并增加。当输入时间达到1.0时，函数必须返回1.0。
typedef float (^SCNActionTimingFunction)(float time);

action.timingMode = SCNActionTimingModeLinear;
action.timingFunction = ^float(float time) {
    return 1.0 - time*time;
};

//速度系数
@property(nonatomic) CGFloat speed;

• SCNActionable协议

//运行动画
- (void)runAction:(SCNAction *)action API_AVAILABLE(macos(10.10));
//运行动画，动画结束block块
- (void)runAction:(SCNAction *)action completionHandler:(nullable void (^)(void))block API_AVAILABLE(macos(10.10));
//运行动画设置key值
- (void)runAction:(SCNAction *)action forKey:(nullable NSString *)key API_AVAILABLE(macos(10.10));
//运行动画设置key值，动画结束block块
- (void)runAction:(SCNAction *)action forKey:(nullable NSString *)key completionHandler:(nullable void (^)(void))block API_AVAILABLE(macos(10.10));

//是否正在动画
@property(nonatomic, readonly) BOOL hasActions API_AVAILABLE(macos(10.10));
//通过key值获取动画
- (nullable SCNAction *)actionForKey:(NSString *)key API_AVAILABLE(macos(10.10));
//通过key值移除动画
- (void)removeActionForKey:(NSString *)key API_AVAILABLE(macos(10.10));
//移除所有动画
- (void)removeAllActions API_AVAILABLE(macos(10.10));
//读取所有动画key值
@property(nonatomic, readonly) NSArray<NSString *> *actionKeys API_AVAILABLE(macos(10.10));