![]() In general, this includes the four edges (leading, trailing, top, and bottom), as well as the height, width, and vertical and horizontal centers. In Auto Layout, the attributes define a feature that can be constrained. When working with constant values, the second item is left blank, the second attribute is set to Not An Attribute, and the multiplier is set to 0.0. You can also assign constant values to an item’s height or width. Constraints can also define the relationship between two different attributes of a single item, for example, setting an aspect ratio between an item’s height and width. These items can represent either views or layout guides. Most constraints define a relationship between two items in our user interface. This value is added to the value of attribute 2. A constant, floating-point offset-in this case, 8.0. If the second item is left blank, this must be Not an Attribute.Ĭonstant. ![]() The attribute to be constrained on the second item-in this case, the blue view’s trailing edge. Unlike the first item, this can be left blank.Īttribute 2. The second item in the equation-in this case, the blue view. The value of attribute 2 is multiplied by this floating point number. In this case, the left and right side are equal. The relationship can have one of three values: equal, greater than or equal, or less than or equal. The relationship between the left and right sides. The attribute to be constrained on the first item-in this case, the red view’s leading edge. ![]() The item must be either a view or a layout guide.Īttribute 1. The first item in the equation-in this case, the red view. This constraint states that the red view’s leading edge must be 8.0 points after the blue view’s trailing edge. Your goal is to declare a series of equations that has one and only one possible solution. Each constraint represents a single equation. Self.highlightArrowDelegate?.highlightArrow(self.The layout of your view hierarchy is defined as a series of linear equations. The CoachMarkController will automatically set an appropriate delegate to this property. HighlightArrowDelegate: CoachMarkBodyHighlightArrowDelegate? If the view itself is the control receiving taps, you might want to forward its highlight state to the arrow view (so they can look like the same component). Note that it doesn't have to be a subview you can return the view itself. func numberOfCoachMarks(for coachMarksController: CoachMarksController) -> Int you must implement a getter method for this property in your view this will let the CoachMarkController know which control should be tapped to display the next coach mark. Note that the CoachMarksController requesting the information is supplied, allowing you to provide data for multiple CoachMarksController, within a single data source. ![]() Let's pretend that you want to show only one coach mark. The first one asks for the number of coach marks to display. = selfĬoachMarksControllerDataSource declares three mandatory methods. Let coachMarksController = CoachMarksController() class DefaultViewController: UIViewController, You should also provide a dataSource, an object conforming to the CoachMarksControllerDataSource protocol. Open up the controller for which you wish to display coach marks and instantiate a new CoachMarksController.
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