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