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报错: Use of undeclared identifier ‘_executing‘; Use of undeclared identifier ‘_finished‘; 解决方法: 在SDWebImageDownloaderOperation类的实现中(@implementation SDWebImageDownloaderOperation{...}下面)添加: @synthesize executing = _executing ; @synthesize finished = _finished;
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原文地址:http://www.cnblogs.com/jsnan/p/4329071.html