Swift-string, Character

String, Character

String uses double quotation marks (") as the bounds in Swift:

"Hello!"  // greeting‘stypeisString

Character can be initialized from string, as long as it contains only one character:

let"H"// validlet"??"// validlet"abc"// invalid - multiple grapheme clusters

String insertion Value

String interpolation allows an expression to be injected, which can be any value, including strings, integers, floating-point numbers, and other kinds.

The syntax is a slash, followed by a pair of parentheses around the value: \(value) . Any valid expression can appear in parentheses, including function calls.

let number = 5let interpolatedNumber = "\(number)" // string is "5"let fortyTwo = "\(6 * 7)" // string is "42"let example = "This post has \(number) view\(number == 1 ? "" : "s")"// It will output "This post has 5 views" for the above example.// If the variable number had the value 1, it would output "This post has 1 view" instead.

Special characters

• /
  Null character
• \
  Slash Slash
• \ t
  tab character
• \v
  Portrait tab
• \ r
  Carriage return character
• \ n
  Line break
• \”
  Double quotes
• \’
  Single quotation marks
• \u{n}
  Unicode symbols

Like what:

message"Then he said, \"I \u{1F496} you!\""print(message"I ?? you!"

Swift-string, Character