映画のスタッフロールみたいなiPhoneアプリのサンプルコードを描いてみます。
#import “ViewController.h”
@import SceneKit;
@interface ViewController () <SCNSceneRendererDelegate>
@property (nonatomic, weak) SCNView *sceneView;
@property (nonatomic) NSTimeInterval interval;
@property (nonatomic) BOOL ready;
@end
@implementation ViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setupScene];
[self createText];
[self createCamera];
}
– (void)setupScene {
SCNView *sv = [[SCNView alloc] initWithFrame:self.view.bounds];
sv.delegate = self;
sv.backgroundColor = [self color:0];
sv.scene = [SCNScene scene];
sv.scene.paused = YES;
self.ready = NO;
[self.view addSubview:sv];
sv.allowsCameraControl = YES;
self.sceneView = sv;
}
– (void)createText {
NSArray *arr = @[@”X”, @”_”, @”A”,@”B”,@”C”,@”D”,@”E”,@”F”,@”G”,@”H”,@”I”];
int size = arc4random_uniform(10) + 20;
NSMutableString *mstr = [NSMutableString string];
for (int i=0; i<size; i++) {
int random = arc4random() % arr.count;
[mstr appendString:arr[random]];
}
SCNText *text = [SCNText textWithString:mstr extrusionDepth:0.3];
text.firstMaterial.diffuse.contents = [[self color:1] colorWithAlphaComponent:0.8];
text.firstMaterial.specular.contents = [self color:2];
text.containerFrame = CGRectMake(-40, –10, 80, 20);
text.alignmentMode = kCAAlignmentCenter;
text.truncationMode = kCATruncationEnd;
text.wrapped = YES;
SCNNode *textNode = [SCNNode nodeWithGeometry:text];
textNode.position = SCNVector3Make(0, 0, 0);
[self.sceneView.scene.rootNode addChildNode:textNode];
[textNode runAction:[SCNAction sequence:@[[SCNAction moveByX:0 y:200 z:0 duration:10.0], [SCNAction fadeOutWithDuration:0.3], [SCNAction runBlock:^(SCNNode *node) { [node removeFromParentNode]; }]]]];
}
– (void)createCamera {
SCNNode *camera = [SCNNode node];
camera.camera = [SCNCamera camera];
camera.camera.zFar = 1000;
camera.camera.yFov = 150;
camera.position = SCNVector3Make(0, 20, 20);
camera.rotation = SCNVector4Make(1, 0, 0, 0.3);
[self.sceneView.scene.rootNode addChildNode:camera];
}
– (void)renderer:(id<SCNSceneRenderer>)aRenderer updateAtTime:(NSTimeInterval)time
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
self.interval = time;
});
if (time – self.interval > 0.8 && self.ready) {
[self createText];
self.interval = time;
return;
}
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.sceneView.scene.paused = NO;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.8 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.ready = YES;
});
}
#define ColorHex(rgb) [UIColor colorWithRed:((rgb & 0xFF0000)>>16)/255.0 green:((rgb & 0xFF00)>>8)/255.0 blue:(rgb & 0xFF)/255.0 alpha:1.0]
– (UIColor *)color:(int)i {
if (i > 4) return nil;
int colorCode[] = {0x040014, 0xFFEF00, 0xFFFAF4};
return ColorHex(colorCode[i]);
}
@end