快速将字符串数组转换为浮点数组

Question

I am building an iOS application using Swift Language. Inside my ViewController2, i have an array of String. How do i convert this array of String to an array of Float value? toPass1 stores numerical values that user enters through the UITextField.

var toPass1 = [String]()
var force = [Float] ()

Answer 1

You can do this

var toPass1 : [String] = ["1.0","2.90","23"]

var force = toPass1.map{
    ($0 as NSString).floatValue
}

Answer 2

Here is an alternative:

var toPass : [String] = ["21.0","3.12","23"]
var force = [Float]()

for item in toPass {
    force.append((item as NSString).floatValue)
}

Answer 3

let toPass = ["1.2", "-15", "4.137e+02"] let force = toPass.map { Float($0)! }