Q: How can you check dynamically at runtime to determine if a category supports a way that will respond to a particular message?

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If You simply need a thumbnail measurement image, retail store a more compact sizing locally. Similarly, utilize any complicated transforms for the picture in advance if possible. Alternatively, conduct the necessary operations about the image off the most crucial thread then refresh the cell once the picture is ready for Exhibit.

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A selector may be the mechanism utilised to pick a technique to execute for an item, or maybe the special identifier that replaces the identify when the source code is compiled. A selector acts like a dynamic operate pointer that hire ipad programmers details for the implementation of a class’ technique.

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Q: What is the delegate sample and what's it utilized for? Explain the delegates used by a UITableView.