By Vandad Nahavandipoor

Completely rewritten for Apple’s speedy programming language, this up-to-date cookbook is helping you triumph over the vexing concerns you’re more likely to face while growing apps for iOS devices.

You’ll locate thousands of latest and revised recipes for utilizing the iOS eight SDK, together with ideas for operating with wellbeing and fitness info and HomeKit components, bettering and animating portraits, storing and keeping facts, sending and receiving notifications, and handling documents and folders between them. every one recipe comprises pattern code on GitHub for you to use right now.

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Figure 1-12. Simple alert view You can also see an example of an action sheet in Figure 1-13. Both action sheets and alert views can easily be created using the UIAlertController class. This class provides you with an instance of UIViewController that you can present on your own view controllers using the presentViewController:animated:completion: method of UIViewController. 6. Displaying Alerts and Action Sheets | 31 Figure 1-13. Simple action sheet A few steps are involved in creating a simple alert view or action sheet: 1.

A picker view on top of the screen As you can see, this specific picker view has two separate and independent visual ele‐ ments. One is on the left, and one is on the right. ). These two items are called components. Each component has rows. Any item in any of the components is in fact represented by a row, as we will soon see. For instance, in the left component, “0 hours” is a row, “1” is a row, etc. Let’s go ahead and create a picker view on our view controller’s view. 42 | Chapter 1: The Basics import UIKit class ViewController: UIViewController { var picker: UIPickerView!

Once you have your blur effect, you can add it to the UIVisualEffectView class. This class itself can accept any visual effect of type UIVisualEffect. Another class of the aforementioned type is the UIVibrancyEffect. This class is very similar to the UIBlurEffect class, and in fact under the hood uses a blur effect as well. UIVibran cyEffect brings out the colors on the layers that are behind it. For instance, if you have a popup window that is about to appear on top of another view that contains many colorful photos on it, it is best to add a UIVibrancyEffect to a visual effect view and construct your popup using this visual effect view.

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