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Additional resources for iOS 8 Swift Programming Cookbook: Solutions & Examples for iOS Apps

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Not all apps act the same when a Sign Out button is pressed by the user. Buttons can have images in them as well as text, as we will soon see. 5. info | 27 Figure 1-9. The Sign Out button is visible at the bottom of the page A button can assign actions to different triggers. For instance, a button can fire one action when the user puts her finger on the button and another action when she lifts her finger off the button. These become actions, and the objects implementing the ac‐ tions become targets.

Info Here is a simple code snippet that will change the on-mode tint color of the switch to red, the off-mode tint color to brown, and the knob’s tint color to green. 8. Picking Values with the UIPickerView Problem You want to allow the users of your app to select from a list of values. Solution Use the UIPickerView class. Discussion A picker view is a graphical element that allows you to display a series of values to your users and allow them to pick one. The Timer section of the Clock app on the iPhone is a great example of this (Figure 1-18).

Creating, Using, and Customizing Switches with UISwitch Problem You would like to give your users the ability to turn an option on or off. 7. info | 37 Solution Use the UISwitch class. Discussion The UISwitch class provides an On/Off control like the one shown in Figure 1-16 for Auto-Capitalization, Auto-Correction, and so on. Figure 1-16. UISwitch in the Settings app In order to create a switch, you can either use Interface Builder or simply create your instance in code. Let’s do it through code.

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