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!)")
}
精彩链接
评论可见，请评论后查看内容，谢谢！！！评论后请刷新页面。
发表评论