How do I set up Debug, Release, and custom configurations in Xcode/Swift?

In Xcode, you can set up multiple build configurations for your Swift projects, allowing you to customize how your application is built in different situations, such as debugging or release. Custom configurations can also be created for various purposes.

Setting Up Build Configurations in Xcode

1. Open your Xcode project.
2. Select the project file in the project navigator.
3. Under the 'Info' tab, you'll see a section called 'Configurations'. By default, there are usually 'Debug' and 'Release' configurations.
4. To add a custom configuration, click the '+' button under the configurations list.
5. Copy an existing configuration or start from scratch as per your requirement. Name your configuration accordingly (e.g., 'Staging').
6. Adjust the settings in the Build Settings tab for your new configuration, such as compiler optimizations, code signing, etc.

Example: Customizing Build Settings for Different Configurations

// Example for setting up different build configurations
// In Debug configuration, you might want to enable assertions

#if DEBUG
    let isDebugMode = true
#else
    let isDebugMode = false
#endif

// Use 'isDebugMode' to conditionally compile your code for Debug and Release configurations
if isDebugMode {
    print("Running in Debug mode!")
} else {
    print("Running in Release mode!")
}