React Native iOS Accessibility Font Scaling Workaround
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// | |
// RCTAccessibilityManager+FontMultipliers.m | |
// | |
// This category is a workaround React Native's default Font Sizing Accessibility settings | |
// | |
// Swizzle the getter of the font size multipliers so we can limit the max size. | |
// | |
#import "RCTAccessibilityManager+FontMultipliers.h" | |
#import <objc/runtime.h> | |
@implementation RCTAccessibilityManager (FontMultipliers) | |
+ (void)load { | |
static dispatch_once_t onceToken; | |
dispatch_once(&onceToken, ^{ | |
Class class = [self class]; | |
SEL originalSelector = @selector(multipliers); | |
SEL swizzledSelector = @selector(custom_accessibility_font_multipliers); | |
Method originalMethod = class_getInstanceMethod(class, originalSelector); | |
Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector); | |
// When swizzling a class method, use the following: | |
// Class class = object_getClass((id)self); | |
// ... | |
// Method originalMethod = class_getClassMethod(class, originalSelector); | |
// Method swizzledMethod = class_getClassMethod(class, swizzledSelector); | |
BOOL didAddMethod = | |
class_addMethod(class, | |
originalSelector, | |
method_getImplementation(swizzledMethod), | |
method_getTypeEncoding(swizzledMethod)); | |
if (didAddMethod) { | |
class_replaceMethod(class, | |
swizzledSelector, | |
method_getImplementation(originalMethod), | |
method_getTypeEncoding(originalMethod)); | |
} else { | |
method_exchangeImplementations(originalMethod, swizzledMethod); | |
} | |
}); | |
} | |
#pragma mark - Method Swizzling | |
- (NSDictionary<NSString *, NSNumber *> *)custom_accessibility_font_multipliers { | |
return @{UIContentSizeCategoryExtraSmall: @0.823, | |
UIContentSizeCategorySmall: @0.882, | |
UIContentSizeCategoryMedium: @0.941, | |
UIContentSizeCategoryLarge: @1.0, | |
UIContentSizeCategoryExtraLarge: @1.118, | |
UIContentSizeCategoryExtraExtraLarge: @1.235, | |
UIContentSizeCategoryExtraExtraExtraLarge: @1.353, | |
UIContentSizeCategoryAccessibilityMedium: @1.5, // cap at 1.5x | |
UIContentSizeCategoryAccessibilityLarge: @1.5, | |
UIContentSizeCategoryAccessibilityExtraLarge: @1.5, | |
UIContentSizeCategoryAccessibilityExtraExtraLarge: @1.5, | |
UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @1.5}; | |
} | |
@end |
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