在哪里可以找到有关 Objective-C 模块的详细介绍或文档？
我正在尝试在 Objective-C 中使用块。我已完成本教程，但我想了解有关块的更多信息。
我应该在哪里寻找有关 Objective-C 块及其用法的更好文档或教程？
I am trying to use blocks in Objective-C. I've worked through this tutorial, but I would like to know more about blocks.
Where should I look for better documentation or tutorials on Objective-C blocks and their usage?
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从评论中收集答案（并为了公平起见将此答案转入社区维基），以便我们得到这个问题的答案：
Apple 的官方文档
http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Blocks/
迈克·阿什
< a href="http://mikeash.com/pyblog/friday-qa-2009-08-14-practical-blocks.html">http://mikeash.com/pyblog/friday-qa-2009-08-14 -practical-blocks.html
可可与爱
http://cocoawithlove.com/2009/10/how-blocks-are-implemented-and.html
Collecting the answers from the comments (and turning this answer community wiki for fairness) so we have an answer to this question:
Apple's official documentation
http://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/Blocks/
Mike Ash
http://mikeash.com/pyblog/friday-qa-2009-08-14-practical-blocks.html
Cocoa With Love
http://cocoawithlove.com/2009/10/how-blocks-are-implemented-and.html