WIP on adding TOTP ui to entry view

MacPass/MPTOTPViewController.m

@@ -0,0 +1,56 @@
+//
+//  MPOTPViewController.m
+//  MacPass
+//
+//  Created by Michael Starke on 27.11.20.
+//  Copyright © 2020 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPTOTPViewController.h"
+
+#import "KPKEntry+OTP.h"
+
+#import <KeePassKit/KeePassKit.h>
+
+@interface MPTOTPViewController ()
+
+@property (strong) KPKOTPGenerator *otpGenerator;
+
+@end
+
+@implementation MPTOTPViewController
+
+- (void)viewDidLoad {
+  self.otpGenerator = [[KPKOTPGenerator alloc] init];
+  [super viewDidLoad];
+}
+
+- (void)setRepresentedObject:(id)representedObject {
+  NSArray *notificationNames = @[KPKWillAddAttributeNotification, KPKDidAddAttributeNotification, KPKWillChangeAttributeNotification, KPKDidChangeAttributeNotification, KPKWillRemoveAttributeNotification, KPKDidRemoveAttributeNotification];
+  if(self.representedObject) {
+    for(NSString *notificationName in notificationNames) {
+      [NSNotificationCenter.defaultCenter removeObserver:self name:notificationName object:self.representedObject];
+    }
+  }
+  super.representedObject = representedObject;
+  if(representedObject) {
+    for(NSString *notificationName in notificationNames) {
+      [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(_didChangeAttribute:) name:notificationName object:representedObject];
+    }
+  }
+  [self _didChangeAttribute:nil];
+}
+
+- (void)_didChangeAttribute:(NSNotification *)notification {
+  KPKEntry *entry = (KPKEntry *)self.representedObject;
+  BOOL showTOTP = entry.hasTOTP;
+  self.view.hidden = !showTOTP;
+  if(showTOTP) {
+    self.remainingTimeProgressIndicator.indeterminate = YES;
+  }
+  else {
+    self.remainingTimeProgressIndicator.indeterminate = NO;
+  }
+}
+
+@end