Esquilli

// Add this to your preferences class 
-(void)pickFont {
    UIFontPickerViewControllerConfiguration *config = [[UIFontPickerViewControllerConfiguration alloc] init];
    config.includeFaces = YES;
    config.displayUsingSystemFont  = NO;

    UIFontPickerViewController *fontPicker = [[UIFontPickerViewController alloc] initWithConfiguration:config];
    fontPicker.delegate = self;
    [self presentViewController:fontPicker animated:YES completion:nil];
}

Esquilli

@try {
      SBLockScreenManager *man = [%c(SBLockScreenManager) sharedInstance];
      
      toggleBiometric = <value from prefs>;

      if ([man respondsToSelector:@selector(setBiometricAutoUnlockingDisabled:forReason:)]) {
          [man setBiometricAutoUnlockingDisabled:toggleBiometric forReason:@"com.esquilli.lisa"];
      }
} @catch (NSException *e) {
    // wut.

Esquilli

// Get documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

// File
NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt", documentsDirectory];

// Write to file
NSString *string = @"Example";
[string writeToFile:fileName