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While this is an easy method to insert a slightly clear shadow over a see, it may end up in bad rendering general performance. Unfortunately, the rendering engine normally ought to Check out Every single pixel with the see to find out the shadow’s outline.
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The respondsToSelector: technique returns a Boolean worth that suggests whether or not the receiver implements or inherits a technique that may reply to a specified message.
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A group is a method to extend an present class and is also a substitute for the usage of subclasses. The most crucial distinction involving subclassing and groups is the fact that a category adds performance to an current course alone that's then offered everywhere inside your code that makes use of that class or its subclasses.