我在IB中创建了一个内容模式为AspectFit的UIImageView。然后我从URL将大图像加载到该View。@IBOutletweakvarpictureView:UIImageView!NSURLSession.sharedSession().dataTaskWithURL(url,completionHandler:{(data,_,error)->Voidinguardletdata=datawhereerror==nil,letimage=UIImage(data:data)else{print(error?.localizedDescription)return}pic