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Swift Convert Int to Character: UnicodeScalar, utf8
UnicodeScalar. In Swift a Character can be constructed from a UnicodeScalar value. And we can build up a UnicodeScalar from an Int. This allows many conversions.
With utf8 and utf16, both properties on a String, we can access all Int values of the characters of a String. With these properties, we can apply number-based conversions to characters.
Int to character. This example converts an Int that represents an ASCII char to an actual Character. The number 97 indicates a lowercase "a."
UnicodeScalar: We convert the value 97 to a UnicodeScalar instance with an init method. We then create a Character from that.
Result: We find that the value 97 was converted into a Character that indicates a lowercase letter "a."
Swift program that converts Int to Character
let value = 97
// Convert Int to a UnicodeScalar.
let u = UnicodeScalar(value)
// Convert UnicodeScalar to a Character.
let char = Character(u)
// Write results.
print(char)
Output
a
Get Ints from Characters. Here we apply the utf16 and utf8 properties on a String. These return Ints that represent that characters in a String.
Utf16: This returns UInt16 values. We can convert these to an Int or cast them with no errors.
Utf8: This returns UInt8 chars. It is important that the string not contain non-ASCII characters when we use this.
Swift program that converts string characters to Ints
let value = "abc"
for u in value.utf16 {
// This value is a UInt16.
print(u)
}
print("") // Write newline.
for u in value.utf8 {
// This value is a UInt8.
print(u)
}
Output
97
98
99
97
98
99
ROT13. Some algorithms, like the ROT13 substitution cipher, require converting from characters to Ints. We can alter characters based on their numeric values.ROT13
A review. Every character has an underlying integer value. In Swift we can use this value, along with UnicodeScalar, to create a Character. This process is logical.
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