如何解决Delegates properties with ARC错误

项目选择了ARC的问题导致：existing instance variable for property  'delegate' for unsafe_unretainedproperty 'delegate' must be __unsafe_unretained

解决方法：

将原来的：

@interface SDWebImageDownloader : NSObject

{

    @private

    id<SDWebImageDownloaderDelegate> delegate;

    NSURLConnection *connection;

    NSMutableData *imageData;

}

@property (nonatomic, assign) id<SDWebImageDownloaderDelegate> delegate;

修改为：

 

@interface SDWebImageDownloader : NSObject

{

    @private

     __unsafe_unretained  id<SDWebImageDownloaderDelegate> delegate;

    NSURLConnection *connection;

    NSMutableData *imageData;

}

@property (nonatomic, assign) id<SDWebImageDownloaderDelegate> delegate;