![]() ![]() The location of the view has just been defined using hard-coded absolute x and y coordinates on the screen. To see this in action, drag a label view from the Library and position it towards the bottom of the view in the horizontal center of the view canvas so the vertical blue guideline appears, indicating that it is centered before dropping the view into place. Views are instead positioned using absolute x and y coordinates. Working with ConstraintsĪlthough Auto Layout is enabled by default, the Interface Builder tool does not automatically apply any default constraints as views are added to the layout. Begin, therefore, by creating a new Xcode project using the iOS App template with the Swift and Storyboard options selected, entering AutoLayoutExample as the product name. An Example of Auto Layout in Actionīefore digging deeper into the Auto Layout features of Interface Builder, the first step in this chapter will be to demonstrate the basic concept of Auto Layout quickly. The chapter will then demonstrate the concepts of content hugging and constraint priorities. Within this chapter, a simple example will be used to demonstrate the effectiveness of Auto Layout, together with an in-depth look at the Auto Layout features of Interface Builder. Not only does this avoid the necessity to write time-consuming code (though for complex layout requirements, some code will be inevitable), but it also provides instant visual feedback on constraints as they are configured. ![]() By far, the most productive and intuitive way to work with constraints is using the Auto Layout features of Interface Builder.
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