Swift打印插值警告处理

let score: Double? = 100
if score == nil {
    print("no score!")
}else{
    print("Score:(score)")
}

⚠️String interpolation produces a debug description for an optional value; did you mean to make this explicit?

处理一：Use 'String(describing:)' to silence this warning

let score: Double? = 100
if score == nil {
    print("no score!")
}else{
    print("Score:(String(describing: score))")
}

处理二：提供默认值

let score: Double? = 100
if score == nil {
    print("no score!")
}else{
    print("Score:(score ?? 0)")
}

处理三：解包

let score: Double? = 100
if score == nil {
    print("no score!")
}else{
    print("Score:(score!)")
}