---
title: "appendInterpolation(timerInterval:pauseTime:countsDown:showsHours:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/localizedstringkey/stringinterpolation/appendinterpolation(timerinterval:pausetime:countsdown:showshours:)"
---

# appendInterpolation(timerInterval:pauseTime:countsDown:showsHours:)

Appends a timer interval to a string interpolation.

## Declaration

```swift
mutating func appendInterpolation(timerInterval: ClosedRange<Date>, pauseTime: Date? = nil, countsDown: Bool = true, showsHours: Bool = true)
```

## Parameters

- `timerInterval`: The interval between where to run the timer.
- `pauseTime`: If present, the date at which to pause the timer. The default is nil which indicates to never pause.
- `countsDown`: Whether to count up or down. The default is true.
- `showsHours`: Whether to include an hours component if there are more than 60 minutes left on the timer. The default is true.

## Discussion

Discussion Don’t call this method directly; it’s used by the compiler when interpreting string interpolations.

## See Also

### Appending to an interpolation

- [appendInterpolation(_:)](swiftui/localizedstringkey/stringinterpolation/appendinterpolation(_:).md)
- [appendInterpolation(_:specifier:)](swiftui/localizedstringkey/stringinterpolation/appendinterpolation(_:specifier:).md)
- [appendInterpolation(_:format:)](swiftui/localizedstringkey/stringinterpolation/appendinterpolation(_:format:).md)
- [appendInterpolation(_:formatter:)](swiftui/localizedstringkey/stringinterpolation/appendinterpolation(_:formatter:).md)
- [appendInterpolation(_:style:)](swiftui/localizedstringkey/stringinterpolation/appendinterpolation(_:style:).md)
- [appendLiteral(_:)](swiftui/localizedstringkey/stringinterpolation/appendliteral(_:).md)