參數(shù)'age'不能有'null'的值，因?yàn)樗念愋停[式默認(rèn)值是'null'。 嘗試添加一個(gè)顯式的非'null'默認(rèn)值或'required'
The?parameter?'age'?can't?have?a?value?of?'null'?because?of?its?type,?but?the?implicit?default?value?is?'null'. Try?adding?either?an?explicit?non-'null'?default?value?or?the?'required'
運(yùn)行報(bào)錯(cuò)
2021-08-12
一旦sdk升級(jí)到2.12以上之后，那么就會(huì)執(zhí)行空安全檢查，如果是非空參數(shù)放在可選參數(shù)列表中要有默認(rèn)值或者通過(guò)required修飾。可參考這篇文章?? flutter- 空安全