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Phone input mask on swift.
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| extension String { | |
| func formatUserInput(pattern: String) -> String { | |
| var inputCollection = Array(self) | |
| var resultCollection: Array<Character> = [] | |
| for i in 0 ..< pattern.count { | |
| let patternCharIndex = String.Index(utf16Offset: i, in: pattern) | |
| let patternChar = pattern[patternCharIndex] | |
| guard let nextInputChar = inputCollection.first else { break } | |
| if (patternChar == nextInputChar || patternChar == "#") { | |
| resultCollection.append(nextInputChar) | |
| inputCollection.removeFirst() | |
| } else { | |
| resultCollection.append(patternChar) | |
| } | |
| } | |
| return String(resultCollection) | |
| } | |
| } |
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