Update the default preference about talking volume. In this edition, if we use this app for the first time, the talking volume will be Normal instead of Loudest. We could update this setting from the setting view.

1.Update by using iOS SDK 16.4 2.Bug fixes.

1. Update by using iOS16.1 SDK. 2. Fix the issue about the color of the view title in the dark mode.

1 Fix the following bugs: 1.1 For the expression calculators and the formula calculator, fix the bug about the error of inputting the dot after the minus. 1.2 Fox the expression calculator, fix the bugs about repeating tapping the equal button and tapping the equal button when we do not input the expression 1.3 For the expression calculator, fix the bugs about tapping the calculate button 1.4 For the expression calculator, fix the bug about tapping the delete button 2. Upgrade the old feature: 2.1 For all of the three kinds of calculators, change the name of top right buttons from Done to Close 2.2 For the formula calculator, add the new Done button when we input the value for parameters. When we input the value for the parameters in the formula calculator, this Done button will be shown at the top right corner. After we tap this Done button, the soft keyboard for the parameter text fields will be hidden immediately. In the earlier editions, when we want to hide this soft keyboard, we need to tap the free spaces outside the text field and the buttons. However, because of using the auto layout, these free spaces became much smaller in the latest edition, so add this Done button in order to hide the soft keyboard easily.

New feature: For the iPhone and iPad, this edition support the landscape view mode. Bug fixes: 1. For expression calculator and formula calculator, sometimes, when the expression is longer, the expression and result field cannot display the whole expression. In this edition, fix this bug by displaying the longer expression in the two lines label when the device is in the portrait mode. 2. For all of three calculators, display the float number without using %g format. As a result, the float number could be display more correctly. 3. For the setting view, remove the useless segment controls and the useless text labels.

1. Use the launch screen storyboard instead of using the launch images 2.Update the text color in order to display correctly in the dark mode 3.Present the major view controllers by using the full screen mode instead of using the default view size.

Upgrade by using iOS 12 SDK and fix the bugs about talking calculator