ARKit基础（五）——AR动画效果

上一节中已经接触过CABasicAnimation

-(void)cupMoveTo:(SCNVector3) position{
    CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.translation"];
    animation.toValue=[NSValue valueWithSCNVector3:position];
    animation.removedOnCompletion=NO;
    animation.duration=2;
    animation.fillMode=kCAFillModeForwards;
    [cupNode addAnimation:animation forKey:@"move"];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        cupNode.position= position;
    });
}

这里再介绍一个旋转动画效果

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    // NSLog(@"touch the screen");
    UITouch *touch=[touches anyObject];
    CGPoint point = [touch locationInView:[touch view]];
    
    SCNVector3 planePos=[self worldPositionFromScreenPosition:point];
    
    if (planePos.x*planePos.x+planePos.y*planePos.y+planePos.z*planePos.z>3) {
        [shipNode removeFromParentNode];
        
        if (shipNode==nil) {
            SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/lamp/lamp.scn"];
            shipNode = scene.rootNode.childNodes[0];
            shipNode.position = SCNVector3Make(0, 0, -1.5);
        }
        
        SCNNode *node1 = [[SCNNode alloc] init];
        node1.position = planePos;
        [sceneView.scene.rootNode addChildNode:node1];
        [node1 addChildNode:shipNode];
        
        CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"rotation"];
        rotationAnimation.duration = 15;
        rotationAnimation.toValue = [NSValue valueWithSCNVector4:SCNVector4Make(0, 1, 0, M_PI * 2)];
        rotationAnimation.repeatCount = FLT_MAX;
      
        [node1 addAnimation:moonRotationAnimation forKey:@"rotation around"];
    }
}