iOS Code Exported from Origami

ViewController.m

#import "ViewController.h"
#import <POP/POP.h>
#import <POP/POPLayerExtras.h>

@interface ViewController ()
@property (nonatomic) CGFloat photoZoomProgress;
@property (nonatomic) CGFloat fadeProgress;
@end

@implementation ViewController

// photoZoom transition

- (void)togglePhotoZoom:(BOOL)on {
  POPSpringAnimation *animation = [self pop_animationForKey:@"photoZoom"];
  
  if (!animation) {
    animation = [POPSpringAnimation animation];
    animation.springBounciness = 7;
    animation.springSpeed = 2;
    animation.property = [POPAnimatableProperty propertyWithName:@"photoZoomProgress" initializer:^(POPMutableAnimatableProperty *prop) {
      prop.readBlock = ^(ViewController *obj, CGFloat values[]) {
        values[0] = obj.photoZoomProgress;
      };
      prop.writeBlock = ^(ViewController *obj, const CGFloat values[]) {
        obj.photoZoomProgress = values[0];
      };
      prop.threshold = 0.001;
    }];
    
    [self pop_addAnimation:animation forKey:@"photoZoom"];
  }
  
  animation.toValue = on ? @(1.0) : @(0.0);
}

- (void)setPhotoZoomProgress:(CGFloat)progress {
  _photoZoomProgress = progress;

  CGFloat alpha = POPTransition(progress, 1, 0);
  self.story.layer.opacity = alpha;

  CGFloat scale = POPTransition(progress, 0.4797, 0.55);
  POPLayerSetScaleXY(self.photo.layer, scale);

  CGFloat yPosition = POPTransition(progress, -186, 0);
  POPLayerSetTranslationY(self.photo.layer, POPPixelsToPoints(-yPosition));

  CGFloat scale2 = POPTransition(progress, 1, 0.97);
  POPLayerSetScaleXY(self.story.layer, scale2);

  CGFloat rotation = POPTransition(progress, 0, 30);
  POPLayerSetRotationZ(self.photo.layer, POPDegreesToRadians(rotation));
}

// fade transition

- (void)toggleFade:(BOOL)on {
  POPSpringAnimation *animation = [self pop_animationForKey:@"fade"];
  
  if (!animation) {
    animation = [POPSpringAnimation animation];
    animation.springBounciness = 15;
    animation.springSpeed = 2;
    animation.property = [POPAnimatableProperty propertyWithName:@"fadeProgress" initializer:^(POPMutableAnimatableProperty *prop) {
      prop.readBlock = ^(ViewController *obj, CGFloat values[]) {
        values[0] = obj.fadeProgress;
      };
      prop.writeBlock = ^(ViewController *obj, const CGFloat values[]) {
        obj.fadeProgress = values[0];
      };
      prop.threshold = 0.001;
    }];
    
    [self pop_addAnimation:animation forKey:@"fade"];
  }
  
  animation.toValue = on ? @(1.0) : @(0.0);
}

- (void)setFadeProgress:(CGFloat)progress {
  _fadeProgress = progress;

  CGFloat alpha2 = POPTransition(progress, 1, 0.3);
  self.photo.layer.opacity = alpha2;
}

// Utilities

static inline CGFloat POPTransition(CGFloat progress, CGFloat startValue, CGFloat endValue) {
  return startValue + (progress * (endValue - startValue));
}

static inline CGFloat POPDegreesToRadians(CGFloat degrees) {
  return M_PI * (degrees / 180.0);
}

static inline CGFloat POPPixelsToPoints(CGFloat pixels) {
  static CGFloat scale = -1;
  if (scale < 0) {
    scale = [UIScreen mainScreen].scale;
  }
  return pixels / scale;
}

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