Added parallax effect (iOS7)

Francesco Mattia · Francesco Mattia · commit d626e30e6cb1 · 2013-08-15T10:33:19.000+01:00
diff --git a/SIAlertView/SIAlertView.h b/SIAlertView/SIAlertView.h
@@ -50,6 +50,8 @@ typedef void(^SIAlertViewHandler)(SIAlertView *alertView);
 
 @property (nonatomic, readonly, getter = isVisible) BOOL visible;
 
+@property (nonatomic, readonly, getter = isParallaxEffectEnabled) BOOL enabledParallaxEffect;
+
 @property (nonatomic, strong) UIColor *viewBackgroundColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
 @property (nonatomic, strong) UIColor *titleColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
 @property (nonatomic, strong) UIColor *messageColor NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
diff --git a/SIAlertView/SIAlertView.m b/SIAlertView/SIAlertView.m
@@ -215,6 +215,7 @@ - (id)initWithTitle:(NSString *)title andMessage:(NSString *)message
 	if (self) {
 		_title = title;
         _message = message;
+        _enabledParallaxEffect = YES;
 		self.items = [[NSMutableArray alloc] init];
 	}
 	return self;
@@ -361,6 +362,9 @@ - (void)show
             self.didShowHandler(self);
         }
         [[NSNotificationCenter defaultCenter] postNotificationName:SIAlertViewDidShowNotification object:self userInfo:nil];
+        #ifdef __IPHONE_7_0
+        [self addParallaxEffect];
+        #endif
         
         [SIAlertView setAnimating:NO];
         
@@ -385,6 +389,9 @@ - (void)dismissAnimated:(BOOL)animated cleanup:(BOOL)cleanup
             self.willDismissHandler(self);
         }
         [[NSNotificationCenter defaultCenter] postNotificationName:SIAlertViewWillDismissNotification object:self userInfo:nil];
+        #ifdef __IPHONE_7_0
+                [self removeParallaxEffect];
+        #endif
     }
     
     void (^dismissComplete)(void) = ^{
@@ -1035,4 +1042,34 @@ -(void)setColor:(UIColor *)color toButtonsOfType:(SIAlertViewButtonType)type {
     }
 }
 
+# pragma mark -
+# pragma mark Enable parallax effect (iOS7 only)
+
+#ifdef __IPHONE_7_0
+- (void)addParallaxEffect
+{
+    if (_enabledParallaxEffect && NSClassFromString(@"UIInterpolatingMotionEffect"))
+    {
+        UIInterpolatingMotionEffect *effectHorizontal = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"position.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
+        UIInterpolatingMotionEffect *effectVertical = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"position.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
+        [effectHorizontal setMaximumRelativeValue:@(20.0f)];
+        [effectHorizontal setMinimumRelativeValue:@(-20.0f)];
+        [effectVertical setMaximumRelativeValue:@(50.0f)];
+        [effectVertical setMinimumRelativeValue:@(-50.0f)];
+        [self.containerView addMotionEffect:effectHorizontal];
+        [self.containerView addMotionEffect:effectVertical];
+    }
+}
+
+- (void)removeParallaxEffect
+{
+    if (_enabledParallaxEffect && NSClassFromString(@"UIInterpolatingMotionEffect"))
+    {
+        [self.containerView.motionEffects enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
+            [self.containerView removeMotionEffect:obj];
+        }];
+    }
+}
+#endif
+
 @end
