第八节 - SCNAction用法详解

SCNAction

学习目标

1.了解SceneKit游戏框架中包含的行为动画种类
2.掌握常用的行为动画

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都有哪些动画行为

1.移动

a.移动相对于当前位置

+ (SCNAction *)moveByX:(CGFloat)deltaX y:(CGFloat)deltaY z:(CGFloat)deltaZ duration:(NSTimeInterval)duration;
+ (SCNAction *)moveBy:(SCNVector3)delta duration:(NSTimeInterval)duration;

b.移动到指定的位置

+ (SCNAction *)moveTo:(SCNVector3)location duration:(NSTimeInterval)duration;

2旋转

a.相对于当前位置旋转

+ (SCNAction *)rotateByX:(CGFloat)xAngle y:(CGFloat)yAngle z:(CGFloat)zAngle duration:(NSTimeInterval)duration;
+ (SCNAction *)rotateByAngle:(CGFloat)angle aroundAxis:(SCNVector3)axis duration:(NSTimeInterval)duration;

b. 旋转到指定的位置

+ (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;
+ (SCNAction *)rotateToAxisAngle:(SCNVector4)axisAngle duration:(NSTimeInterval)duration;

3.缩放

a.相对于当前的尺寸缩放

+ (SCNAction *)scaleBy:(CGFloat)scale duration:(NSTimeInterval)sec;

b.缩放到指定的比例

+ (SCNAction *)scaleTo:(CGFloat)scale duration:(NSTimeInterval)sec;

4.透明度

a.透明度增加到1

+ (SCNAction *)fadeInWithDuration:(NSTimeInterval)sec;

b.透明减小到0

+ (SCNAction *)fadeOutWithDuration:(NSTimeInterval)sec;

c.透明度逐渐递增

+ (SCNAction *)fadeOpacityBy:(CGFloat)factor duration:(NSTimeInterval)sec;

d.透明度逐渐递减

+ (SCNAction *)fadeOpacityTo:(CGFloat)opacity duration:(NSTimeInterval)sec;

5.隐藏或不隐藏(让节点隐藏或者不隐藏)

 + (SCNAction *)hide NS_AVAILABLE(10_11, 9_0);
 + (SCNAction *)unhide NS_AVAILABLE(10_11, 9_0);

6.等待

a.等待指定时间

+ (SCNAction *)waitForDuration:(NSTimeInterval)sec;

b.等待随机时间

 + (SCNAction *)waitForDuration:(NSTimeInterval)sec withRange:(NSTimeInterval)durationRange;

7.从父节点移除子节点

+ (SCNAction *)removeFromParentNode;

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特殊函数介绍

a.让行为相反

- (SCNAction *)reversedAction;

b.让行为永久执行

+ (SCNAction *)repeatActionForever:(SCNAction *)action;

c.让行为执行N次

+ (SCNAction *)repeatAction:(SCNAction *)action count:(NSUInteger)count;

d.把多个行为放在数组中一个一个执行

+ (SCNAction *)sequence:(NSArray<SCNAction *> *)actions;

e.把多个行为进行捆绑 一次执行

+ (SCNAction *)group:(NSArray<SCNAction *> *)actions;

f.执行代码块

 + (SCNAction *)runBlock:(void (^)(SCNNode *node))block;
 + (SCNAction *)runBlock:(void (^)(SCNNode *node))block queue:(dispatch_queue_t)queue;

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自定义动画介绍

+ (SCNAction *)customActionWithDuration:(NSTimeInterval)seconds actionBlock:(void (^)(SCNNode *node, CGFloat elapsedTime))block;

javaScript动画函数介绍

a.创建一个行为执行一个javaScript程序 + (SCNAction *)javaScriptActionWithScript:(NSString *)script duration:(NSTimeInterval)seconds;

在节点位置播放声音

+ (SCNAction *)playAudioSource:(SCNAudioSource *)source waitForCompletion:(BOOL)wait NS_AVAILABLE(10_11, 9_0);

上面我们的游戏中动画行为基本已经介绍完毕,都很简单!

程序员的最爱

练习

1.创建一个正方体
2.让其不断自转
3.让其在y轴方向不断的移动

动画分解图

第一步.创建工程

学习很好玩

第二步.添加游戏框架

兴趣很重要

第三步.添加SceneKit 专用显示视图SCNView

SCNView *scnView = [[SCNView alloc]initWithFrame:self.view.bounds];
scnView .backgroundColor = [UIColor blackColor];
[self.view addSubview:scnView ];
scnView.scene = [SCNScene scene];

第四步.设置游戏场景

    scnView.scene = [SCNScene scene];

第五步.添加照相机

SCNCamera *camera = [SCNCamera camera];
SCNNode *cameraNode =[SCNNode node];
cameraNode.camera = camera;
cameraNode.position = SCNVector3Make(0, 0, 50);
[scnView.scene.rootNode addChildNode:cameraNode];

第六步.添加正方体

SCNBox *box = [SCNBox boxWithWidth:10 height:10 length:10 chamferRadius:0];
box.firstMaterial.diffuse.contents = [UIImage imageNamed:@"1.PNG"];
SCNNode *boxNode =[SCNNode node];
boxNode.position = SCNVector3Make(0, 0, 0);
boxNode.geometry = box;
[scnView .scene.rootNode addChildNode:boxNode];

第七步.添加动画行为

 // 创建动画行为
SCNAction *rotation = [SCNAction rotateByAngle:10 aroundAxis:SCNVector3Make(0, 1, 0) duration:2];
SCNAction *moveUp = [SCNAction moveTo:SCNVector3Make(0, 15, 0) duration:1];
SCNAction *moveDown = [SCNAction moveTo:SCNVector3Make(0, -15, 0) duration:1];
// 顺序执行的动画
SCNAction *sequence = [SCNAction sequence:@[moveUp,moveDown]];
// 组合动画的执行
SCNAction *group = [SCNAction group:@[sequence ,rotation]];
[boxNode runAction:[SCNAction repeatActionForever:group]];

执行效果:

真开心,和我们想的效果完全一样

本节内容比较简单,大家在使用的时候,翻看这篇文章即可!