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苹果开发中文网站透彻理解 NSNotificationCenter 通知（附实现代码）
source link: http://www.cocoachina.com/ios/20190125/26230.html
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NSNotificationCenter这个东西作为iOS工程师想必都不陌生，但是有人可能连参数的意义都没搞明白，写这篇文章的目的不止是为了让不会用的人会用，更是为了让会用的人理解得更透彻。本篇文章主要是梳理NSNotificationCenter的特性和值得注意的地方，并且在后面结合对其特性的分析手动利用代码来实现它。
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