Swift

发布时间：2020-12-14 02:34:32 所属栏目：百科来源：网络整理

导读：Beginning Swift Optionals Safe Unwrapping if myOptional != nil { myOptional!} 或者 if let unwrapped = myOptional { //use unwrapped here} 类型转换 String to Int var languagesLearned: String = "3"var languagesLearnedNum: Int? = Int(languages

Beginning Swift

Optionals

Safe Unwrapping

if myOptional != nil {
    myOptional!
}

或者

if let unwrapped = myOptional {
    //use unwrapped here
}

类型转换
String to Int

var languagesLearned: String = "3"
var languagesLearnedNum: Int? = Int(languagesLearned)

（编辑：李大同）

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