如何将 CGPoints 列表转置为 Swift 数组

Question

I have a (list) of CGPoints returned in the format below (with line feeds ("/n") on each line):

80.0 (return)
100.0 (return)
120.0 (return)
150.0 (return)

I wish to transpose the above CGPoint (Doubles) (list) into a Swift (Integer) array [80,100,120,140] using this Swift statement: Array(arrayLiteral: list) :

But first I must convert the line feeds (return "/n" ) to commas ( "," ) using this Swift RegEx statement below, which is not working for some reason:

let wantedList = list.replacingOccurrences(of: "\n", with: ",",options: .regularExpression)

Any suggestions where:

a) I am screwing up in this RegEx conversion? b) Some way to do a one-pass transposition to get the desired array of CGPoints in the form of [80,100,120,140]

Clarification:

Many thanks: worked like a charm when passing in the raw CGPoints between a string literal (""") ! In my particular case: I am passing in my CGPoints in the form of a string variable: let list = "(frame.origin.y)" ). I cannot figure out how to insert the required double quotes at the beginning and end of this list variable so I keep getting back each CGPoint as an individual array ie [80][100] rather than as a fully populated array [80,100,120,140] .

Answer 1

You can split your string into lines and compact map the substrings up to the first space trying to initialize a Double:

let string = """
80.0 (return)
100.0 (return)
120.0 (return)
150.0 (return)
"""

---

let values = string.split(whereSeparator: \.isNewline)
    .compactMap { 
        Double($0[..<($0.firstIndex(of: " ") ?? $0.endIndex)])
    }
print(values)  // "[80.0, 100.0, 120.0, 150.0]\n"

---

If you would like integers instead of Doubles just try to find a period instead of a space:

let integers = string.split(whereSeparator: \.isNewline)
    .compactMap {
        Int($0[..<($0.firstIndex(of: ".") ?? $0.endIndex)])
    }
print(integers)  // "[80, 100, 120, 150]\n"