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當我更新變量時，我無法獲取要更改的變量。當我觸摸按鈕並且變量「self.hasYawCenterPointBeenSet」在方法內被更新時，但是當「updateCycle」方法回到變量周圍時，「reCenterYaw」方法觸發並未顯示它已被更新。 updateCycle是我的CADisplaylink驅動的方法。我試着將變量更新爲原子，用「_」和「self」作爲它們的實例變量引用它們。不知道發生了什麼事。使用時不更新的變量CADisplayLink
#import "GameViewController.h"
#import <CoreMotion/CoreMotion.h>
#import <SpriteKit/SpriteKit.h>
#import "HUDOverlay.h"
@interface GameViewController()
@property (strong, nonatomic) CMMotionManager *motionManager;
@property (strong, nonatomic) CMAttitude *currentAttitude;
@property (strong, nonatomic) SCNNode *cameraNode;
@property (strong, nonatomic) SCNScene *scene;
@property (nonatomic) float roll;
@property (nonatomic) float yaw;
@property (nonatomic) float pitch;
@property (atomic) float yawCenterPoint;
@property (atomic) BOOL hasYawCenterPointBeenSet;
@end
GameViewController* sharedGameViewController = nil;
@implementation GameViewController
+(GameViewController*)sharedController{
if (sharedGameViewController == nil) {
sharedGameViewController = [[GameViewController alloc] init];
}
return sharedGameViewController;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// create a new scene
//SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/ship.dae"];
_scene = [SCNScene new];
self.hasYawCenterPointBeenSet = NO;
// create and add a camera to the scene
_cameraNode = [SCNNode node];
_cameraNode.camera = [SCNCamera camera];
[_scene.rootNode addChildNode:_cameraNode];
// place the camera
_cameraNode.position = SCNVector3Make(0, 0, 0);
// create and add a light to the scene
SCNNode *lightNode = [SCNNode node];
lightNode.light = [SCNLight light];
lightNode.light.type = SCNLightTypeOmni;
lightNode.position = SCNVector3Make(0, 10, 10);
[_scene.rootNode addChildNode:lightNode];
// create and add an ambient light to the scene
SCNNode *ambientLightNode = [SCNNode node];
ambientLightNode.light = [SCNLight light];
ambientLightNode.light.type = SCNLightTypeAmbient;
ambientLightNode.light.color = [UIColor whiteColor];
[_scene.rootNode addChildNode:ambientLightNode];
// retrieve the SCNView
SCNView *scnView = (SCNView *)self.view;
scnView.delegate = self;
scnView.playing = YES;
// set the scene to the view
scnView.scene = _scene;
scnView.overlaySKScene = [HUDOverlay sceneWithSize:scnView.frame.size];
// allows the user to manipulate the camera
scnView.allowsCameraControl = NO;
// show statistics such as fps and timing information
scnView.showsStatistics = YES;
// configure the view
scnView.backgroundColor = [UIColor blueColor];
// // add a tap gesture recognizer
// UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
// NSMutableArray *gestureRecognizers = [NSMutableArray array];
// [gestureRecognizers addObject:tapGesture];
// [gestureRecognizers addObjectsFromArray:scnView.gestureRecognizers];
// scnView.gestureRecognizers = gestureRecognizers;
SCNNode *sampleNode = [SCNNode new];
SCNPlane *samplePlane = [SCNPlane planeWithWidth:3 height:5];
SCNMaterial *angryFrontMaterial = [SCNMaterial material];
angryFrontMaterial.diffuse.contents = [UIImage imageNamed:@"angryfront110.png"];
sampleNode.geometry = samplePlane;
sampleNode.geometry.firstMaterial = angryFrontMaterial;
sampleNode.position = SCNVector3Make(0, 0, -10);
[_scene.rootNode addChildNode:sampleNode];
// SCNAction *moveToCamera = [SCNAction moveTo:SCNVector3Make(0, 0, -10) duration:10];
// [sampleNode runAction:moveToCamera];
[self setupRotationGrid];
[self setupMotionCapture];
displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateCycle)];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
//This is the update loop for the sceneView. When the view updates per frame this is where the logic goes
-(void)renderer:(id<SCNSceneRenderer>)aRenderer updateAtTime:(NSTimeInterval)time{
}
-(void)updateCycle{
_currentAttitude = _motionManager.deviceMotion.attitude;
_roll = _currentAttitude.roll + (.5 * M_PI);
_yaw = _currentAttitude.yaw;
_pitch = _currentAttitude.pitch;
_cameraNode.eulerAngles = SCNVector3Make(-_roll, _yaw, _pitch);
//NSLog(@"yawCenterPoint = %d", _hasYawCenterPointBeenSet);
if (self.hasYawCenterPointBeenSet == NO) {
_yawCenterPoint = _yaw;
self.hasYawCenterPointBeenSet = YES;
NSLog(@"Yawcenter point set to %f", _yawCenterPoint);
}
//NSLog(@"Roll: %f Yaw: %f Pitch: %f", _roll, _yaw, _pitch);
}
-(void)setupRotationGrid {
double radius = 30;
double numberOfItems = 8;
SCNGeometry *geometry = [SCNBox boxWithWidth:4.5 height:8 length:3.25 chamferRadius:0.5];
double x = 0.0;
double z = radius;
double theta = (M_PI)/(numberOfItems/2);
double incrementalY = (M_PI)/(numberOfItems*2);
SCNNode *nodeCollection = [SCNNode node];
nodeCollection.position = SCNVector3Make(0, 4, 0);
for (int index = 1; index <= numberOfItems; index++) {
x = radius * sin(index*theta);
z = radius * cos(index*theta);
SCNNode *node = [SCNNode node];
node.geometry = geometry;
node.position = SCNVector3Make(x, 0, z);
float rotation = incrementalY * index;
node.rotation = SCNVector4Make(0, 1, 0, rotation);
[nodeCollection addChildNode:node];
}
[_scene.rootNode addChildNode:nodeCollection];
}
- (void) handleTap:(UIGestureRecognizer*)gestureRecognize
{
// retrieve the SCNView
SCNView *scnView = (SCNView *)self.view;
// check what nodes are tapped
CGPoint p = [gestureRecognize locationInView:scnView];
NSArray *hitResults = [scnView hitTest:p options:nil];
// check that we clicked on at least one object
if([hitResults count] > 0){
// retrieved the first clicked object
SCNHitTestResult *result = [hitResults objectAtIndex:0];
// get its material
SCNMaterial *material = result.node.geometry.firstMaterial;
// highlight it
[SCNTransaction begin];
[SCNTransaction setAnimationDuration:0.5];
// on completion - unhighlight
[SCNTransaction setCompletionBlock:^{
[SCNTransaction begin];
[SCNTransaction setAnimationDuration:0.5];
material.emission.contents = [UIColor blackColor];
[SCNTransaction commit];
}];
material.emission.contents = [UIColor redColor];
[SCNTransaction commit];
}
}
-(void)reCenterYaw{
self.hasYawCenterPointBeenSet = NO;
NSLog(@"Tapped recenter");
}
-(void)setupMotionCapture{
_motionManager = [[CMMotionManager alloc] init];
_motionManager.deviceMotionUpdateInterval = 1.0/60.0;
if (_motionManager.isDeviceMotionAvailable) {
[_motionManager startDeviceMotionUpdates];
_currentAttitude = _motionManager.deviceMotion.attitude;
}
// if (!_hasYawCenterPointBeenSet) {
// _yawCenterPoint = _currentAttitude.yaw;
// _hasYawCenterPointBeenSet = YES;
// }
}
- (BOOL)shouldAutorotate
{
return YES;
}
- (BOOL)prefersStatusBarHidden {
return YES;
}
- (NSUInteger)supportedInterfaceOrientations
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return UIInterfaceOrientationMaskLandscape;
} else {
return UIInterfaceOrientationMaskAll;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
@end