topBarBlur for ios (#1760)

README.md

 | drawUnderTabBar       |  ✅     |    WIP @gran33     |      [Contribute](CONTRIBUTING.md)       | |
 | drawUnderTopBar       |  ✅     |    WIP @gran33     |      [Contribute](CONTRIBUTING.md)       ||
 | statusBarBlur         |  ✅     |    ✅     |      [Contribute](CONTRIBUTING.md)       | @gtchance|
-| topBarBlur            | ✅      |    [Contribute](CONTRIBUTING.md)     |      [Contribute](CONTRIBUTING.md)       |
+| topBarBlur            | ✅      |    ✅     |      [Contribute](CONTRIBUTING.md)       | @gtchance|
 | tabBarHidden  |   ✅  |   ✅     |    [Contribute](CONTRIBUTING.md)        | @gtchance|
 | statusBarTextColorScheme |  ✅   |   in development      |      / iOS specific    |
 | statusBarTextColorSchemeSingleScreen|  ✅   |     in development    |     / iOS specific      |

lib/ios/RNNNavigationOptions.h

 #import <UIKit/UIKit.h>
 
 extern const NSInteger BLUR_STATUS_TAG;
+extern const NSInteger BLUR_TOPBAR_TAG;
 
 @interface RNNNavigationOptions : NSObject
 
 @property (nonatomic, strong) NSNumber* statusBarBlur;
 @property (nonatomic, strong) NSNumber* statusBarHideWithTopBar;
 @property (nonatomic, strong) NSNumber* tabBarHidden;
+@property (nonatomic, strong) NSNumber* topBarBlur;
 
 -(instancetype)init;
 -(instancetype)initWithDict:(NSDictionary *)navigationOptions;

lib/ios/RNNNavigationOptions.m

 #import <React/RCTConvert.h>
 
 const NSInteger BLUR_STATUS_TAG = 78264801;
+const NSInteger BLUR_TOPBAR_TAG = 78264802;
 
 @implementation RNNNavigationOptions
 
 	self.rightButtons = [navigationOptions objectForKey:@"rightButtons"];
 	self.topBarNoBorder = [navigationOptions objectForKey:@"topBarNoBorder"];
 	self.tabBarHidden = [navigationOptions objectForKey:@"tabBarHidden"];
+	self.topBarBlur = [navigationOptions objectForKey:@"topBarBlur"];
 
 	return self;
 }
 			}
 		}
 	}
-	
+
+	if (self.topBarBlur && [self.topBarBlur boolValue]) {
+
+		if (![viewController.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG]) {
+
+			[viewController.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
+			viewController.navigationController.navigationBar.shadowImage = [UIImage new];
+			UIVisualEffectView *blur = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];
+			CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
+			blur.frame = CGRectMake(0, -1 * statusBarFrame.size.height, viewController.navigationController.navigationBar.frame.size.width, viewController.navigationController.navigationBar.frame.size.height + statusBarFrame.size.height);
+			blur.userInteractionEnabled = NO;
+			blur.tag = BLUR_TOPBAR_TAG;
+			[viewController.navigationController.navigationBar insertSubview:blur atIndex:0];
+			[viewController.navigationController.navigationBar sendSubviewToBack:blur];
+		}
+
+	} else {
+		UIView *blur = [viewController.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG];
+		if (blur) {
+			[viewController.navigationController.navigationBar setBackgroundImage: nil forBarMetrics:UIBarMetricsDefault];
+			viewController.navigationController.navigationBar.shadowImage = nil;
+			[blur removeFromSuperview];
+		}
+	}
+
 }
 
 @end

lib/ios/ReactNativeNavigationTests/RNNRootViewControllerTest.m

 	XCTAssertFalse([self.uut hidesBottomBarWhenPushed]);
 }
 
+-(void)testTopBarBlur_default {
+	__unused UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:self.uut];
+	[self.uut viewWillAppear:false];
+	XCTAssertNil([self.uut.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG]);
+}
+
+
+-(void)testTopBarBlur_false {
+	NSNumber* topBarBlurInput = @(0);
+	self.options.topBarBlur = topBarBlurInput;
+	__unused UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:self.uut];
+	[self.uut viewWillAppear:false];
+	XCTAssertNil([self.uut.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG]);
+}
+
+-(void)testTopBarBlur_true {
+	NSNumber* topBarBlurInput = @(1);
+	self.options.topBarBlur = topBarBlurInput;
+	__unused UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:self.uut];
+	[self.uut viewWillAppear:false];
+	XCTAssertNotNil([self.uut.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG]);
+}
+
 @end