How to download and setup particle-swift
Open terminal and run command
                                            git clone https://github.com/particle-iot/particle-swift.git
                                        
                                        git clone is used to create a copy or clone of particle-swift 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 particle-swift https://github.com/particle-iot/particle-swift/archive/master.zip
Or simply clone particle-swift with SSH
                                            [email protected]:particle-iot/particle-swift.git                                    
                                    If you have some problems with particle-swift
You may open issue on particle-swift support forum (system) here: https://github.com/particle-iot/particle-swift/issuesSimilar to particle-swift repositories
Here you may see particle-swift alternatives and analogs
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