Support centered bottomTab icons using bottomTabs.titleDisplayMode option (#5667)

* Support centered bottomTab icons using bottomTabs.titleDisplayMode option

* Improve readability, better namings

* Rename setTabItemImagesCentered to centerTabItems

lib/ios/RNNBottomTabsOptions.h

@@ -17,5 +17,6 @@
 @property (nonatomic, strong) Text* currentTabId;
 @property (nonatomic, strong) Text* barStyle;
 @property (nonatomic, strong) Text* fontFamily;
+@property (nonatomic, strong) Text* titleDisplayMode;
 
 @end

lib/ios/RNNBottomTabsOptions.m

@@ -20,6 +20,7 @@
 	self.currentTabId = [TextParser parse:dict key:@"currentTabId"];
 	self.barStyle = [TextParser parse:dict key:@"barStyle"];
 	self.fontFamily = [TextParser parse:dict key:@"fontFamily"];
+	self.titleDisplayMode = [TextParser parse:dict key:@"titleDisplayMode"];
 	
 	return self;
 }

lib/ios/RNNBottomTabsPresenter.m

@@ -9,6 +9,9 @@
     UITabBarController *bottomTabs = self.boundViewController;
     RNNNavigationOptions *withDefault = [options withDefault:[self defaultOptions]];
     [bottomTabs setCurrentTabIndex:[withDefault.bottomTabs.currentTabIndex getWithDefaultValue:0]];
+	if ([[withDefault.bottomTabs.titleDisplayMode getWithDefaultValue:@"alwaysShow"] isEqualToString:@"alwaysHide"]) {
+		[bottomTabs centerTabItems];
+	}
 }
 
 - (void)applyOptions:(RNNNavigationOptions *)options {

lib/ios/ReactNativeNavigation.xcodeproj/project.pbxproj

@@ -50,6 +50,7 @@
 		390AD478200F499D00A8250D /* RNNSwizzles.m in Sources */ = {isa = PBXBuildFile; fileRef = 390AD476200F499D00A8250D /* RNNSwizzles.m */; };
 		4534E72520CB6724009F8185 /* RNNLargeTitleOptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 4534E72320CB6724009F8185 /* RNNLargeTitleOptions.h */; };
 		4534E72620CB6724009F8185 /* RNNLargeTitleOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = 4534E72420CB6724009F8185 /* RNNLargeTitleOptions.m */; };
+		5008641223856A2D00A55BE9 /* UITabBar+utils.m in Sources */ = {isa = PBXBuildFile; fileRef = 5008641023856A2C00A55BE9 /* UITabBar+utils.m */; };
 		501214C9217741A000435148 /* libOCMock.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 501214C8217741A000435148 /* libOCMock.a */; };
 		501223D72173590F000F5F98 /* RNNStackPresenter.h in Headers */ = {isa = PBXBuildFile; fileRef = 501223D52173590F000F5F98 /* RNNStackPresenter.h */; };
 		501223D82173590F000F5F98 /* RNNStackPresenter.m in Sources */ = {isa = PBXBuildFile; fileRef = 501223D62173590F000F5F98 /* RNNStackPresenter.m */; };
@@ -399,6 +400,8 @@
 		390AD476200F499D00A8250D /* RNNSwizzles.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNSwizzles.m; sourceTree = "<group>"; };
 		4534E72320CB6724009F8185 /* RNNLargeTitleOptions.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RNNLargeTitleOptions.h; sourceTree = "<group>"; };
 		4534E72420CB6724009F8185 /* RNNLargeTitleOptions.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RNNLargeTitleOptions.m; sourceTree = "<group>"; };
+		5008641023856A2C00A55BE9 /* UITabBar+utils.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "UITabBar+utils.m"; sourceTree = "<group>"; };
+		5008641123856A2D00A55BE9 /* UITabBar+utils.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "UITabBar+utils.h"; sourceTree = "<group>"; };
 		501214C8217741A000435148 /* libOCMock.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; path = libOCMock.a; sourceTree = "<group>"; };
 		501223D52173590F000F5F98 /* RNNStackPresenter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNStackPresenter.h; sourceTree = "<group>"; };
 		501223D62173590F000F5F98 /* RNNStackPresenter.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNStackPresenter.m; sourceTree = "<group>"; };
@@ -733,6 +736,8 @@
 				50706E6C20CE7CA5003345C3 /* UIImage+tint.m */,
 				506317A8220B547400B26FC3 /* UIImage+insets.h */,
 				506317A9220B547400B26FC3 /* UIImage+insets.m */,
+				5008641123856A2D00A55BE9 /* UITabBar+utils.h */,
+				5008641023856A2C00A55BE9 /* UITabBar+utils.m */,
 				5038A372216CDDB6009280BC /* UIViewController+SideMenuController.h */,
 				5038A373216CDDB6009280BC /* UIViewController+SideMenuController.m */,
 				5038A3BF216E1E66009280BC /* RNNFontAttributesCreator.h */,
@@ -1604,6 +1609,7 @@
 				501224072173592D000F5F98 /* RNNBottomTabsPresenter.m in Sources */,
 				50A00C38200F84D6000F01A6 /* RNNOverlayOptions.m in Sources */,
 				5039559C2174867000B0A663 /* DoubleParser.m in Sources */,
+				5008641223856A2D00A55BE9 /* UITabBar+utils.m in Sources */,
 				E5F6C3A822DB4D0F0093C2CE /* UIView+Utils.m in Sources */,
 				5049593F216F5D73006D2B81 /* BoolParser.m in Sources */,
 				50EB93421FE14A3E00BD8EEE /* RNNBottomTabOptions.m in Sources */,

lib/ios/ReactNativeNavigationTests/RNNTabBarPresenterTest.m

@@ -54,6 +54,22 @@
     [self.boundViewController verify];
 }
 
+- (void)testApplyOptionsOnInit_alwaysShow_shouldNotCenterTabImages {
+	RNNNavigationOptions *initialOptions = [[RNNNavigationOptions alloc] initEmptyOptions];
+	initialOptions.bottomTabs.titleDisplayMode = [[Text alloc] initWithValue:@"alwaysShow"];
+	[[self.boundViewController reject] centerTabItems];
+	[self.uut applyOptionsOnInit:initialOptions];
+	[self.boundViewController verify];
+}
+
+- (void)testApplyOptions_shouldApplyOptionsOnInit_alwaysHide_shouldCenterTabImages {
+	RNNNavigationOptions *initialOptions = [[RNNNavigationOptions alloc] initEmptyOptions];
+	initialOptions.bottomTabs.titleDisplayMode = [[Text alloc] initWithValue:@"alwaysHide"];
+	[[self.boundViewController expect] centerTabItems];
+	[self.uut applyOptionsOnInit:initialOptions];
+	[self.boundViewController verify];
+}
+
 - (void)testViewDidLayoutSubviews_appliesBadgeOnNextRunLoop {
     id uut = [self uut];
     [[uut expect] applyDotIndicator];

lib/ios/ReactNativeNavigationTests/UITabBarController+RNNOptionsTest.m

@@ -1,6 +1,7 @@
 #import <XCTest/XCTest.h>
-#import <OCMockObject.h>
+#import <OCMock/OCMock.h>
 #import "UITabBarController+RNNOptions.h"
+#import "UITabBar+utils.h"
 
 @interface UITabBarController_RNNOptionsTest : XCTestCase
 
@@ -13,6 +14,7 @@
 - (void)setUp {
     [super setUp];
 	self.uut = [OCMockObject partialMockForObject:[UITabBarController new]];
+	OCMStub([self.uut tabBar]).andReturn([OCMockObject partialMockForObject:[UITabBar new]]);
 }
 
 - (void)test_tabBarTranslucent_true {
@@ -39,6 +41,12 @@
 	XCTAssertFalse(self.uut.tabBar.clipsToBounds);
 }
 
+- (void)test_centerTabItems {
+	[[(id)self.uut.tabBar expect] centerTabItems];
+	[self.uut centerTabItems];
+	[(id)self.uut.tabBar verify];
+}
+
 - (void)test_tabBarBackgroundColor {
 	UIColor* tabBarBackgroundColor = [UIColor redColor];
 

lib/ios/UITabBar+utils.h

@@ -0,0 +1,7 @@
+#import <UIKit/UIKit.h>
+
+@interface UITabBar (utils)
+
+- (void)centerTabItems;
+
+@end

lib/ios/UITabBar+utils.m

@@ -0,0 +1,60 @@
+#import "UITabBar+utils.h"
+#import <objc/runtime.h>
+
+#define BADGE_OFFSET 0.2
+#define IMAGE_VIEW_TAG 1
+
+typedef void (*UITabBarButton_layoutSubviews__IMP)(void);
+static UITabBarButton_layoutSubviews__IMP original_UITabBarButton_layoutSubviews;
+
+@implementation UITabBar (utils)
+
+- (void)centerTabItems {
+	[self removeTabBarItemTitles];
+	[self swizzleUITabBarButton];
+}
+
+- (void)removeTabBarItemTitles {
+	for (UITabBarItem* item in self.items) {
+		item.title = nil;
+	}
+}
+
+- (void)swizzleUITabBarButton {
+	static dispatch_once_t onceToken;
+	dispatch_once(&onceToken, ^{
+		[[self class] swizzleUITabBarButtonLayoutSubviews];
+	});
+}
+
++ (void)swizzleUITabBarButtonLayoutSubviews {
+	Class UITabBarButtonClass = NSClassFromString(@"UITabBarButton");
+	
+	SEL layoutSubviewsSEL = @selector(layoutSubviews);
+	Method layoutSubviewsMethod = class_getInstanceMethod(UITabBarButtonClass, layoutSubviewsSEL);
+	IMP layoutSubviewsIMP = method_getImplementation(layoutSubviewsMethod);
+	
+	original_UITabBarButton_layoutSubviews = layoutSubviewsIMP;
+	
+	SEL swizzleUITabBarButton_layoutSubviewsSEL = @selector(swizzleUITabBarButton_layoutSubviews);
+	Method swizzleUITabBarButton_layoutSubviewsMethod = class_getInstanceMethod(self, swizzleUITabBarButton_layoutSubviewsSEL);
+	
+	method_exchangeImplementations(layoutSubviewsMethod, swizzleUITabBarButton_layoutSubviewsMethod);
+}
+
+- (void)swizzleUITabBarButton_layoutSubviews {
+	original_UITabBarButton_layoutSubviews();
+	for (UIView *subView in self.subviews) {
+		if ([subView isKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {
+			subView.center = CGPointMake(subView.center.x, subView.superview.frame.size.height / 2);
+			subView.tag = IMAGE_VIEW_TAG;
+		}
+		
+		if ([subView isKindOfClass:NSClassFromString(@"_UIBadgeView")]) {
+			UIView* imageView = [subView.superview viewWithTag:IMAGE_VIEW_TAG];
+			subView.frame = CGRectMake(subView.frame.origin.x, (imageView.frame.origin.y + imageView.frame.size.height * BADGE_OFFSET) - subView.frame.size.height / 2, subView.frame.size.width, subView.frame.size.height);
+		}
+	}
+}
+
+@end

lib/ios/UITabBarController+RNNOptions.h

@@ -18,4 +18,6 @@
 
 - (void)setTabBarVisible:(BOOL)visible animated:(BOOL)animated;
 
+- (void)centerTabItems;
+
 @end

lib/ios/UITabBarController+RNNOptions.m

@@ -1,5 +1,6 @@
 #import "UITabBarController+RNNOptions.h"
 #import "RNNBottomTabsController.h"
+#import "UITabBar+utils.h"
 
 @implementation UITabBarController (RNNOptions)
 
@@ -74,6 +75,10 @@
 	}
 }
 
+- (void)centerTabItems {
+	[self.tabBar centerTabItems];
+}
+
 - (void)forEachTab:(void (^)(UIView *, UIViewController * tabViewController, int tabIndex))performOnTab {
     int tabIndex = 0;
     for (UIView * tab in self.tabBar.subviews) {