Disable Mac Catalyst 77% app scaling

UINSSceneView+CTX.h

//
//  UINSSceneView+CTX.h
//  EFClass
//
//  Created by Stefan Ceriu on 28/11/2019.
//  Copyright © 2019 EF Education First. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSObject (CTX)

@end

UINSSceneView+CTX.m

//
//  UINSSceneView+CTX.m
//  EFClass
//
//  Created by Stefan Ceriu on 28/11/2019.
//  Copyright © 2019 EF Education First. All rights reserved.
//

#import "UINSSceneView+CTX.h"

#import <objc/runtime.h>

@implementation NSObject (CTX)

+ (void)load
{
#if TARGET_OS_MACCATALYST
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        CTXSwizzleInstanceMethod(objc_getClass("UINSSceneView"), NSSelectorFromString(@"scaleFactor"), @selector(ctx_scaleFactor));
    });
#endif
}

- (CGFloat)ctx_scaleFactor
{
    return 1.0f;
}

static void CTXSwizzleInstanceMethod(Class class, SEL originalSelector, SEL swizzledSelector) {
    Method originalMethod = class_getInstanceMethod(class, originalSelector);
    Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
    
    if (class_addMethod(class, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))) {
        class_replaceMethod(class, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
    } else {
        method_exchangeImplementations(originalMethod, swizzledMethod);
    }
}

@end

Hello! Building a macos app using react-native for ios + Catalyst and I'm wondering how to implement this fix. Any chances to get support on how this fix is being applied?

Hey, normally you would just drop it into your project but I don’t know how that works in react native.

This seems to have stopped working on macOS 11.3, anyone can confirm?

not work on macOS 11.3

macOS 11.3 has different APIs. I have made my implementation public: OverrideCatalystScaleFactor.swift

Nice! 👌