Working with a method that can take an NSError suggests applying an optional variable (a variable that might or might not exist) as well as the unwrapping the error if it exists.

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UITableDataSource: Utilized to retrieve details associated with how Every cell while in the desk need to be rendered, how many rows you will discover, if rows is usually edited or moved, and so forth.

By default, when animating a view with a shadow, the shadow is redrawn in the course of Each and every phase of your animation. You'll be able to optimize animations with shadows by rasterizing the layer of your perspective Along with the shadow.

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As stated in Apple’s Cocoa Developer’s Guidebook, “the key worth of delegation is it lets you easily customize the habits of a number of objects in one central item”.

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A typical explanation for exc_bad_access mistakes that aren't detectable from the compiler is seeking to entry released objects. In this kind of circumstances, enabling NSZombies in Xcode may be a good debugging approach. Enabling NSZombies retains objects that would normally be introduced alive as “zombies”.

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Not utilizing a reuse identifier effectively. The default conduct whenever a table is scrolled is desk cells that go offscreen are deallocated and new cells are created for the new articles which is proven. Once you use a reuse identifier, when a mobile goes off display screen it is not deallocated and as an alternative cached for reuse.

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