Fix for ImagePicker's camera resetting [UIApplication sharedApplication].idleTimerDisabled = YES;

ZTSCameraControllerHelper.m

@interface ZTSCameraControllerHelper ()
@property (nonatomic, assign, getter = isIdleTimerDisabled) BOOL idleTimerDisabled;
@end

@implementation ZTSCameraControllerHelper

+ (instancetype)sharedInstance {
    static ZTSCameraControllerHelper *instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[ZTSCameraControllerHelper alloc] init];
    });
    return instance;
}

+ (void)load {
    [self swizzleMethods];
}

+ (void)swizzleMethods {
    // To make sure PhotoLibrary framework classes are registered
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker = nil;
    
    Class cameraControllerClass = NSClassFromString(@"PLCameraController");

    // method called just before we render camera preview for the first time
    Method delayMethod = class_getInstanceMethod(self, @selector(zts_delayIdleTimerByTimeInterval:));
    IMP delayIMP = method_getImplementation(delayMethod);
    PSPDFReplaceMethod(cameraControllerClass, sel_getUid("_delayIdleTimerByTimeInterval:"), @selector(zts_delayIdleTimerByTimeInterval:), delayIMP);
    
    // method called after camera preview stopped
    Method resetIdleTimerMethod = class_getInstanceMethod(self, @selector(zts_resetIdleTimer));
    IMP resetIdleTimerIMP = method_getImplementation(resetIdleTimerMethod);
    
    PSPDFReplaceMethod(cameraControllerClass, sel_getUid("_resetIdleTimer"), @selector(zts_resetIdleTimer), resetIdleTimerIMP);
}

- (void)zts_delayIdleTimerByTimeInterval:(NSTimeInterval)delay {
    [ZTSCameraControllerHelper sharedInstance].idleTimerDisabled = [UIApplication sharedApplication].isIdleTimerDisabled;
    if (![ZTSCameraControllerHelper sharedInstance].isIdleTimerDisabled) {
        [self zts_delayIdleTimerByTimeInterval:delay];
    }
}

- (void)zts_resetIdleTimer {
    if (![ZTSCameraControllerHelper sharedInstance].isIdleTimerDisabled) {
        [self zts_resetIdleTimer];
    }
}

@end

Fix for ImagePicker's camera resetting [UIApplication sharedApplication].idleTimerDisabled = YES;

The same issue happens when you're using dictation feature - it effectively resets the idleTimerDisabled to NO.

The faulty calls are -[UIDictationController setupForDictationStartForReason:] and -[UIDictationController cancelDictation]