Question

let tabClosures = [
"Adicionar": {(a:Float, b:Float)-> Float in var varaux = a + b; return varaux;},     "Subtrair":{(a:Float, b:Float)-> Float in var varaux = a - b; return varaux;},     "Multiplicar": {$0 * $1},     
"FarToCelsius": { (a:Float, b:Float) -> Float in var varaux = (a * 9 / 5 + 32); return varaux;},     
"CelsiusToFar": { (a:Float, b:Float) -> Float in var varaux = (a - 32)*5/9; return varaux;},     
"KelvinToCelsius": { (a:Float, b:Float) -> Float in var varaux = (a - 273.15); return varaux;},     
"CelsiusToKelvin": { (a:Float, b:Float) -> Float in var varaux = (a + 273.15); return varaux;} ]  
let val1:Float = 120.1 
let val2:Float = 10.1  
for(x, y) in tabClosures{     
if( x == "FarToCelsius"){         
print("\(x): \(y(val1, val2))")}     
else     if( x == "CelsiusToFar"){         
print("\(x): \(y(val1, val2))")}}

如何在没有For循环的情况下拾取此数组的元素。我想，例如用字符串搜索一个元素。例如，我有一个字符串是＆＃34; FarToCelsius＆＃34;我想执行＆＃34; FarToCelsius＆＃34;关闭元素。

Answer 1

这是一个你可以做到的词典：

if let fn = tabClosures["FarToCelsius"] {
    let res = fn(2.2, 3.0)
    print("\(res)")
}

Swift阵列闭包 - 查找元素

1 个答案: