Add Swift-related warning in Playground
Add Swift-related warning in Playground

ichu501/DFImageManager,benzhipeng/DFImageManager,JeeLiu/DFImageManager,peterpaulis/DFImageManager,DABSquared/DFImageManager,holgersindbaek/DFImageManager,peterpaulis/DFImageManager,zht415/DFImageManager,jsooriah/DFImageManager,mohsinalimat/DFImageManager,vitkovsky/DFImageManager,digal/DFImageManager,AddAloner/DFImageManager,Adlai-Holler/DFImageManager,digal/DFImageManager,arvindhsukumar/DFImageManager,AddAloner/DFImageManager,holgersindbaek/DFImageManager,zhaoguohui/DFImageManager,hzm0318hzm/DFImageManager,kean/DFImageManager,benzhipeng/DFImageManager,buithuyen/DFImageManager,buithuyen/DFImageManager,mohsinalimat/DFImageManager