yeet

node_modules/expo-font/ios/EXFont/Singletons/EXFontScalersManager.h

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+// Copyright 2018-present 650 Industries. All rights reserved.
+
+#import <UMCore/UMSingletonModule.h>
+#import <UMFontInterface/UMFontScalersManagerInterface.h>
+
+@interface EXFontScalersManager : UMSingletonModule <UMFontScalersManagerInterface>
+
+@end

node_modules/expo-font/ios/EXFont/Singletons/EXFontScalersManager.m

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+// Copyright 2018-present 650 Industries. All rights reserved.
+
+#import <EXFont/EXFontScalersManager.h>
+
+#import <UMCore/UMDefines.h>
+#import <EXFont/EXFont.h>
+
+#import <objc/runtime.h>
+
+static NSPointerArray *currentFontScalers;
+
+@implementation UIFont (EXFontLoader)
+
+- (UIFont *)EXFontWithSize:(CGFloat)fontSize
+{
+  for (id<UMFontScalerInterface> fontScaler in currentFontScalers) {
+    UIFont *scaledFont = [fontScaler scaledFont:self toSize:fontSize];
+    if (scaledFont) {
+      return scaledFont;
+    }
+  }
+
+  return [self EXFontWithSize:fontSize];
+}
+
+@end
+
+/**
+ * A singleton module responsible for overriding UIFont's
+ * fontWithSize: method which is used for scaling fonts.
+ * We need this one, central place to store the scalers
+ * as for now to get rid of timing problems when backgrounding/
+ * foregrounding apps.
+ */
+
+@implementation EXFontScalersManager
+
+UM_REGISTER_SINGLETON_MODULE(FontScalersManager);
+
++ (void)initialize
+{
+  static dispatch_once_t initializeCurrentFontScalersOnce;
+  dispatch_once(&initializeCurrentFontScalersOnce, ^{
+    currentFontScalers = [NSPointerArray weakObjectsPointerArray];
+
+    Class uiFont = [UIFont class];
+    SEL uiUpdate = @selector(fontWithSize:);
+    SEL exUpdate = @selector(EXFontWithSize:);
+
+    method_exchangeImplementations(class_getInstanceMethod(uiFont, uiUpdate),
+                                   class_getInstanceMethod(uiFont, exUpdate));
+  });
+}
+
+- (void)registerFontScaler:(id<UMFontScalerInterface>)fontScaler
+{
+  [currentFontScalers compact];
+  [currentFontScalers addPointer:(__bridge void * _Nullable)(fontScaler)];
+}
+
+@end