「Swift」オプショナル変数をアンラップ(unwrap)する方法
使用例
var cft: cfting? = "fcai"
print(cft!)
print(cft)
print(cft! + "456")
var cft: cfting? = "fcai"
print(cft!)
print(cft)
print(cft! + "456")
var cft: cfting? = "fcai" print(cft!) print(cft) print(cft! + "456")
実行結果
“fcai"
Optional(“fcai")
“fcai456"