Recipe: Building a Custom Lock Control
We created the lock control you see in Figure 2-8 for a conference after wrapping up the last edition of this Cookbook. At that time, numerous people asked for this recipe to be included in the next edition. It’s surprisingly easy to build from a UIControl point of view. It consists of four elements: a backdrop, the lock image (which switches to an unlocked version on success), the drag track, and the thumb.
Figure 2-8 This simple lock control unlocks and removes itself after the user successfully swipes across at least three-quarters of the way.
Recipe 2-9 shows the code that creates this control’s behavior. ...
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