如何圈圖像

Question

你好，我在我的應用程序中使用SDWebImage。這是我的代碼，以使圖像中的圓圈

extension UIImage { 
var circle: UIImage? { 
     let square = CGSize(width: min(size.width, size.height), height: min(size.width, size.height)) 
     let imageView = UIImageView(frame: CGRect(origin: CGPoint(x: 0, y: 0), size: square)) 
     imageView.contentMode = .ScaleAspectFill 
     imageView.image = self 
     imageView.layer.cornerRadius = square.width/2 
     imageView.layer.masksToBounds = true 
     UIGraphicsBeginImageContext(imageView.bounds.size) 
     guard let context = UIGraphicsGetCurrentContext() else { return nil } 
     imageView.layer.renderInContext(context) 
     let result = UIGraphicsGetImageFromCurrentImageContext() 
     UIGraphicsEndImageContext() 
     return result 
    } 
} 

從here

複製它，我用來做圖像cicle這樣

let profilePicture = UIImage(data: NSData(contentsOfURL: NSURL(string:"http://i.stack.imgur.com/Xs4RX.jpg")!)!)! 

profilePicture.circle 

，但現在由於我使用SDWebImage它不是工作

cell.profileImageView.sd_setImageWithURL(UIImage().absoluteURL(profileImageUrl), placeholderImage: UIImage.init(named: "default-profile-icon")?.circle!) 

請讓我知道我可以彌補這方面的推廣工作SDWebImage

Answer 1

可以使用SDWebImageManager下載圖片或把它從緩存和應用圈在完成塊這樣的：

SDWebImageManager.sharedManager().downloadWithURL(NSURL(string:"img"), options: [], progress: nil) { (image:UIImage!, error:NSError!, cacheType:SDImageCacheType, finished:Bool) -> Void in 
    if (image != nil){ 
     let circleImage = image.circle 
     cell.profileImageView.image = circleImage 
    } 
} 

或者你可以使用sd_setImageWithURL方法，它採用的版本一個完成塊作爲參數

let completionBlock: SDWebImageCompletionBlock! = {(image: UIImage!, error: NSError!, cacheType: SDImageCacheType!, imageURL: NSURL!) -> Void in 
    if (image != nil){ 
     let circleImage = image.circle 
     cell.profileImageView.image = circleImage 
    } 
} 
cell.profileImageView.sd_setImageWithURL(UIImage().absoluteURL(profileImageUrl), placeholderImage: UIImage.init(named: "default-profile-icon")?.circle!, completed: completionBlock)