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iosswiftsdwebimage

Use of singleton for SDWebImage

I am not 100% familiar with the concept of using singleton for additional frameworks. For example, what is the difference between the following two function calls for SDWebImage, when I should use which. Some small examples would be great

SDWebImageManager().saveImageToCache(myImg, forURL: myUrl)
SDWebImageManager.sharedManager().saveImageToCache(myImg, forURL: myUrl)
Solution
    • when I should use which:

    You should always use 

     SDWebImageManager.sharedManager().saveImageToCache(myImg, forURL: myUrl)
   <=> let sharedInstance = SDWebImageManager.sharedManager();
           sharedInstance.saveImageToCache(myImg, forURL: myUrl)
    • Why: SDWebImageManager.sharedManager() means: call method sharedManager of class SDWebImageManager to get an instance of Class SDWebImageManager,

    then you call saveImageToCache(...) to call method saveImageToCache of that instance.