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苹果开发中文网站iOS开发之利用Block逆向传值
source link: http://www.cocoachina.com/ios/20190114/26123.html
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Block传值，需要注意的是，谁传值就需要定义Block，捕获方仅仅需要传递Block给传值方，并处理捕获的值。
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