fix(iOS): implement scaleX and scaleY transition animations.

lib/ios/ElementAnimator.m

@@ -3,10 +3,12 @@
 #import "ElementHorizontalTransition.h"
 #import "ElementVerticalTransition.h"
 #import "HorizontalTranslationTransition.h"
+#import "HorizontalScaleTransition.h"
 #import "RNNElementFinder.h"
 #import "Transition.h"
 #import "VerticalRotationTransition.h"
 #import "VerticalTranslationTransition.h"
+#import "VerticalScaleTransition.h"
 
 @implementation ElementAnimator {
     UIView *_containerView;
@@ -60,6 +62,18 @@ - (instancetype)initWithTransitionOptions:(TransitionOptions *)transitionOptions
                                   transitionDetails:transitionOptions.rotationY]];
     }
 
+    if (transitionOptions.scaleX.hasAnimation) {
+        [animations addObject:[[HorizontalScaleTransition alloc]
+                                       initWithView:self.view
+                                  transitionDetails:transitionOptions.scaleX]];
+    }
+
+    if (transitionOptions.scaleY.hasAnimation) {
+        [animations addObject:[[VerticalScaleTransition alloc]
+                                       initWithView:self.view
+                                  transitionDetails:transitionOptions.scaleY]];
+    }
+
     return animations;
 }
 

lib/ios/HorizontalScaleTransition.h

@@ -0,0 +1,6 @@
+#import "FloatTransition.h"
+#import <Foundation/Foundation.h>
+
+@interface HorizontalScaleTransition : FloatTransition
+
+@end

lib/ios/HorizontalScaleTransition.m

@@ -0,0 +1,21 @@
+#import "HorizontalScaleTransition.h"
+
+@implementation HorizontalScaleTransition
+
+- (CATransform3D)animateWithProgress:(CGFloat)p {
+    CGFloat scaleX = [RNNInterpolator fromFloat:self.from
+                                   toFloat:self.to
+                                   precent:p
+                              interpolator:self.interpolator];
+    return CATransform3DMakeScale(scaleX, 1, 1);
+}
+
+- (CGFloat)calculateFrom:(Double *)from {
+    return from.hasValue ? from.get : 1;
+}
+
+- (CGFloat)calculateTo:(Double *)to {
+    return to.hasValue ? to.get : 1;
+}
+
+@end

lib/ios/TransitionOptions.m

@@ -8,6 +8,8 @@ - (instancetype)initWithDict:(NSDictionary *)dict {
     self.alpha = [[TransitionDetailsOptions alloc] initWithDict:dict[@"alpha"]];
     self.x = [[TransitionDetailsOptions alloc] initWithDict:dict[@"x"]];
     self.y = [[TransitionDetailsOptions alloc] initWithDict:dict[@"y"]];
+    self.scaleX = [[TransitionDetailsOptions alloc] initWithDict:dict[@"scaleX"]];
+    self.scaleY = [[TransitionDetailsOptions alloc] initWithDict:dict[@"scaleY"]];
     self.translationX = [[TransitionDetailsOptions alloc] initWithDict:dict[@"translationX"]];
     self.translationY = [[TransitionDetailsOptions alloc] initWithDict:dict[@"translationY"]];
     self.rotationX = [[TransitionDetailsOptions alloc] initWithDict:dict[@"rotationX"]];
@@ -23,6 +25,8 @@ - (void)mergeOptions:(TransitionOptions *)options {
     [self.alpha mergeOptions:options.alpha];
     [self.x mergeOptions:options.x];
     [self.y mergeOptions:options.y];
+    [self.scaleX mergeOptions:options.scaleX];
+    [self.scaleY mergeOptions:options.scaleY];
     [self.translationX mergeOptions:options.translationX];
     [self.translationY mergeOptions:options.translationY];
     [self.rotationX mergeOptions:options.rotationX];
@@ -36,12 +40,14 @@ - (void)mergeOptions:(TransitionOptions *)options {
 
 - (BOOL)hasAnimation {
     return self.x.hasAnimation || self.y.hasAnimation || self.alpha.hasAnimation ||
+           self.scaleX.hasAnimation || self.scaleY.hasAnimation ||
            self.translationX.hasAnimation || self.translationY.hasAnimation ||
            self.rotationX.hasAnimation || self.rotationY.hasAnimation;
 }
 
 - (BOOL)hasValue {
     return self.x.hasAnimation || self.y.hasAnimation || self.alpha.hasAnimation ||
+           self.scaleX.hasAnimation || self.scaleY.hasAnimation ||
            self.translationX.hasAnimation || self.translationY.hasAnimation ||
            self.rotationX.hasAnimation || self.rotationY.hasAnimation ||
            self.waitForRender.hasValue || self.enable.hasValue;
@@ -61,6 +67,14 @@ - (NSTimeInterval)maxDuration {
         maxDuration = [_y.duration withDefault:0];
     }
 
+    if ([_scaleX.duration withDefault:0] > maxDuration) {
+        maxDuration = [_scaleX.duration withDefault:0];
+    }
+
+    if ([_scaleY.duration withDefault:0] > maxDuration) {
+        maxDuration = [_scaleY.duration withDefault:0];
+    }
+
     if ([_translationX.duration withDefault:0] > maxDuration) {
         maxDuration = [_translationX.duration withDefault:0];
     }

lib/ios/VerticalScaleTransition.h

@@ -0,0 +1,6 @@
+#import "FloatTransition.h"
+#import <Foundation/Foundation.h>
+
+@interface VerticalScaleTransition : FloatTransition
+
+@end

lib/ios/VerticalScaleTransition.m

@@ -0,0 +1,21 @@
+#import "VerticalScaleTransition.h"
+
+@implementation VerticalScaleTransition
+
+- (CATransform3D)animateWithProgress:(CGFloat)p {
+    CGFloat scaleY = [RNNInterpolator fromFloat:self.from
+                                   toFloat:self.to
+                                   precent:p
+                              interpolator:self.interpolator];
+    return CATransform3DMakeScale(1, scaleY, 1);
+}
+
+- (CGFloat)calculateFrom:(Double *)from {
+    return from.hasValue ? from.get : 1;
+}
+
+- (CGFloat)calculateTo:(Double *)to {
+    return to.hasValue ? to.get : 1;
+}
+
+@end