react-native-navigation/lib/ios/RNNTransitionStateHolder.m

#import "RNNTransitionStateHolder.h"
#import "RNNUtils.h"

@interface RNNTransitionStateHolder() {
	CGRect _initialFrame;
}

@end
@implementation RNNTransitionStateHolder

-(instancetype)initWithTransition:(NSDictionary *)transition {
	self = [super init];
	
	self.springDamping = [RNNUtils getDoubleOrKey:transition withKey:@"springDamping" withDefault:0.85];
	self.springVelocity = [RNNUtils getDoubleOrKey:transition withKey:@"springVelocity" withDefault:0.8];
	self.startDelay = [RNNUtils getDoubleOrKey:transition withKey:@"startDelay" withDefault:0];
	self.duration = [RNNUtils getDoubleOrKey:transition withKey:@"duration" withDefault:1];
	self.startAlpha = [RNNUtils getDoubleOrKey:transition withKey:@"startAlpha" withDefault:1];
	self.endAlpha = [RNNUtils getDoubleOrKey:transition withKey:@"endAlpha" withDefault:1];
	self.interactivePop = [RNNUtils getBoolOrKey:transition withKey:@"interactivePop" withDefault:NO];
	self.startX = [RNNUtils getDoubleOrKey:transition[@"x"] withKey:@"from" withDefault:0];
	self.startY = [RNNUtils getDoubleOrKey:transition[@"y"] withKey:@"from" withDefault:0];
	self.endX = [RNNUtils getDoubleOrKey:transition[@"x"] withKey:@"to" withDefault:0];
	self.endY = [RNNUtils getDoubleOrKey:transition[@"y"] withKey:@"to" withDefault:0];
	self.fromId = [transition objectForKey:@"fromId"];
	self.toId = [transition objectForKey:@"toId"];
	self.isSharedElementTransition = [[transition objectForKey:@"type"] isEqualToString:@"sharedElement"];
	self.interpolation = [self animationOptionsFromString:transition[@"interpolation"]];
	
	
	return self;
}

- (UIViewAnimationOptions)animationOptionsFromString:(NSString*)interpolationString {
	if ([interpolationString isEqualToString:@"accelerate"]) {
		return UIViewAnimationOptionCurveEaseIn;
	} else if ([interpolationString isEqualToString:@"decelerate"]) {
		return UIViewAnimationOptionCurveEaseOut;
	}
	
	return UIViewAnimationOptionCurveEaseInOut;
}

- (void)setupInitialTransitionForView:(UIView*)view {
	_initialFrame = view.frame;
	view.alpha = self.startAlpha;
	view.frame = CGRectMake(_initialFrame.origin.x + self.startX, _initialFrame.origin.y + self.startY, view.frame.size.width, view.frame.size.height);
}

- (void)completeTransitionForView:(UIView*)view {
	view.alpha = self.endAlpha;
	view.frame = CGRectMake(_initialFrame.origin.x + self.endX, _initialFrame.origin.y + self.endY, view.frame.size.width, view.frame.size.height);
	[view layoutSubviews];
}

@end