Change access the imageData in NSURLSession delegate queue to solve non thread-safe issue. Also, ensure imageData in completion block is immutable to avoid accident modification from the other queue
Change access the imageData in NSURLSession delegate queue to solve non thread-safe issue. Also, ensure imageData in completion block is immutable to avoid accident modification from the other queue

odyth/SDWebImage,dreampiggy/SDWebImage,awkward/SDWebImage,altrooz/SDWebImage,Insfgg99x/SDWebImage,awkward/SDWebImage,dpettigrew/SDWebImage,smule/SDWebImage,tualatrix/SDWebImage,dreampiggy/SDWebImage,zhang-yawei/SDWebImage,iheartradio/SDWebImage,awkward/SDWebImage,dreampiggy/SDWebImage,rs/SDWebImage