A custom modal sheet is a full-screen view that slides over your app’s current screen. Use this type of sheet when you want to present a custom interface modally. The top-left corner of the modal sheet is reserved for the Close button, which dismisses the interface. The Close button is always white.
Retitle the Close button if doing so makes sense. Apple Watch supplies a default title for the Close button, but you can change it to convey a different meaning. The most common alternate titles for this button are Done and Dismiss.
Don’t use “Back” or “<“ in the Close button title. You don’t want your custom Close button title to mislead users into thinking that the sheet is part of a hierarchical navigation interface.
Don’t use the Close button to title the page. If the Close button looks like a page or an app title, or if its title is empty, users won’t know how to dismiss the modal sheet.
Don’t misuse modal sheets. Use modal sheets only as a temporary interruption to the current workflow, and use them only to facilitate some critical task. Never use them to navigate your app’s content.
Use the system’s alerts and action sheets in appropriate situations. Use alerts and action sheets for their intended purposes and do not replace them with custom modal sheets. For information about how to use alerts and actions, see Alert and Action Sheets.