MotionEffects/CustomMotionEffectVC.m
/* |
File: CustomMotionEffectVC.m |
Abstract: Demonstrates using a custom motion effect to bring a |
specially-prepared image to life by allowing the viewer to look behind objects |
in the foreground as they rotate the device. |
Version: 1.0 |
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*/ |
#import "CustomMotionEffectVC.h" |
#import "PerspectiveMotionEffect.h" |
@interface CustomMotionEffectVC () <UINavigationControllerDelegate> |
@property (nonatomic, weak) CALayer *sky; |
@property (nonatomic, weak) CALayer *water; |
@property (nonatomic, weak) CALayer *foreground5; |
@property (nonatomic, weak) CALayer *foreground4; |
@property (nonatomic, weak) CALayer *foreground3; |
@property (nonatomic, weak) CALayer *foreground2; |
@property (nonatomic, weak) CALayer *foreground1; |
@property (nonatomic, strong) PerspectiveMotionEffect *motionEffect; |
@end |
@implementation CustomMotionEffectVC |
//| ---------------------------------------------------------------------------- |
- (void)viewDidLoad |
{ |
[super viewDidLoad]; |
NSBundle *mainBundle = [NSBundle mainBundle]; |
CALayer* (^LoadPhotoLayer)(NSString*) = ^(NSString *imgName) { |
UIImage *layerImage = [[UIImage alloc] initWithContentsOfFile:[mainBundle pathForResource:imgName ofType:@"png"]]; |
CALayer *layer = [CALayer layer]; |
layer.contents = (__bridge id)(layerImage.CGImage); |
layer.bounds = CGRectMake(0, 0, layerImage.size.width, layerImage.size.height); |
layer.contentsScale = layerImage.scale; |
[self.view.layer addSublayer:layer]; |
return layer; |
}; |
self.sky = LoadPhotoLayer(@"Sky"); |
self.water = LoadPhotoLayer(@"Water"); |
self.foreground5 = LoadPhotoLayer(@"Foreground5"); |
self.foreground4 = LoadPhotoLayer(@"Foreground4"); |
self.foreground3 = LoadPhotoLayer(@"Foreground3"); |
self.foreground2 = LoadPhotoLayer(@"Foreground2"); |
self.foreground1 = LoadPhotoLayer(@"Foreground1"); |
// Create, configure, and apply our custom motion effect. |
// See the ReadMe for a discussion about how the values used to |
// configure the PerspectiveMotionEffect were chosen. |
PerspectiveMotionEffect *motionEffect = [[PerspectiveMotionEffect alloc] init]; |
motionEffect.cameraPositionZ = 1504; |
motionEffect.maximumViewingAngleX = 2.0 * M_PI / 180.0f; |
motionEffect.maximumViewingAngleY = 18.0 * M_PI / 180.0f; |
[self.view addMotionEffect:motionEffect]; |
self.motionEffect = motionEffect; |
} |
//| ---------------------------------------------------------------------------- |
- (void)viewDidLayoutSubviews |
{ |
// The layers must be positioned here because the bounds of our view are |
// undefined until layout has occurred at least once, which has not happened |
// when -viewDidLoad was invoked. |
CGPoint center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds)); |
// See the ReadMe for a discussion about how these position values were |
// chosen. |
self.sky.position = center; |
self.water.position = center; |
self.water.zPosition = 5; |
self.foreground5.position = center; |
self.foreground5.zPosition = 40; |
self.foreground4.position = center; |
self.foreground4.zPosition = 66; |
self.foreground3.position = center; |
self.foreground3.zPosition = 82; |
self.foreground2.position = center; |
self.foreground2.zPosition = 97; |
self.foreground1.position = center; |
self.foreground1.zPosition = 104; |
} |
//| ---------------------------------------------------------------------------- |
- (void)viewDidAppear:(BOOL)animated |
{ |
// Start with the navigation bar hidden so the full image is visible. |
[self.navigationController setNavigationBarHidden:YES animated:YES]; |
} |
//| ---------------------------------------------------------------------------- |
//! Toggles the 'hidden' property of the navigation bar. |
// |
- (IBAction)tapGestureRecognizerAction:(id)sender |
{ |
[self.navigationController setNavigationBarHidden:!self.navigationController.navigationBarHidden animated:YES]; |
} |
//| ---------------------------------------------------------------------------- |
- (IBAction)dismissButtonAction:(id)sender |
{ |
[self dismissViewControllerAnimated:YES completion:NULL]; |
} |
//| ---------------------------------------------------------------------------- |
- (BOOL)prefersStatusBarHidden |
{ |
return YES; |
} |
@end |
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