nipple
                                The script takes one large PNG image and creates AppIcon.appiconset for Apple Xcode with all icons prefilled for iPhone, iPad and Apple Watch.
                            
                        How to download and setup nipple
Open terminal and run command
                                            git clone https://github.com/michaelnitsenko/nipple.git
                                        
                                        git clone is used to create a copy or clone of nipple repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with nipple https://github.com/michaelnitsenko/nipple/archive/master.zip
Or simply clone nipple with SSH
                                            [email protected]:michaelnitsenko/nipple.git                                    
                                    If you have some problems with nipple
You may open issue on nipple support forum (system) here: https://github.com/michaelnitsenko/nipple/issuesSimilar to nipple repositories
Here you may see nipple alternatives and analogs
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