UIDebuggingInformationOverlay for iOS 10, 11, and 12

DebuggingOverlay.m

#import <objc/runtime.h>

@interface DebuggingOverlay: NSObject

@end

@implementation DebuggingOverlay

+ (void)toggleOverlay {
    id debugInfoClass = NSClassFromString(@"UIDebuggingInformationOverlay");

    // In iOS 11, Apple added additional checks to disable this overlay unless the
    // device is an internal device. To get around this, we swizzle out the
    // -[UIDebuggingInformationOverlay init] method (which returns nil now if
    // the device is non-internal), and we call:
    // [[UIDebuggingInformationOverlayInvokeGestureHandler mainHandler] _handleActivationGesture:(UIGestureRecognizer *)]
    // to show the window, since that now adds the debugging view controllers, and calls
    // [overlay toggleVisibility] for us.
    if (@available(iOS 11.0, *)) {
        id handlerClass = NSClassFromString(@"UIDebuggingInformationOverlayInvokeGestureHandler");

        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            // Swizzle init of debugInfo class to just call [UIWindow init]
            Method initMethod = class_getInstanceMethod(debugInfoClass, @selector(init));
            IMP newInit = method_getImplementation(class_getInstanceMethod([UIWindow class], @selector(init)));
            method_setImplementation(initMethod, newInit);
        });

        id debugOverlayInstance = [debugInfoClass performSelector:NSSelectorFromString(@"overlay")];
        [debugOverlayInstance setFrame:[[UIScreen mainScreen] bounds]];

        UIGestureRecognizer *dummyGestureRecognizer = [[UIGestureRecognizer alloc] init];
        dummyGestureRecognizer.state = UIGestureRecognizerStateEnded;

        id handler = [handlerClass performSelector:NSSelectorFromString(@"mainHandler")];
        [handler performSelector:NSSelectorFromString(@"_handleActivationGesture:") withObject:dummyGestureRecognizer];
    } else {
        id debugOverlayInstance = [debugInfoClass performSelector:NSSelectorFromString(@"overlay")];
        [debugOverlayInstance performSelector:NSSelectorFromString(@"toggleVisibility")];
    }

}

@end

Hi Ian,

How to call this toggleOverlay method from swift class .