Xcode6编译SDWebImage报错解决方法(SDWebImageDownloaderOperation.m错误)

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;

即可。