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 {
    
    size_t width, height;
    UIImageOrientation orientation;
    BOOL responseFromCached;
}

//  解决Xcode6编译SDWebImage报错解决方法(SDWebImageDownloaderOperation.m错误)
@synthesize executing = _executing ;
@synthesize finished = _finished;

注明出处：http://blog.youkuaiyun.com/cuibo1123