swift - 通过可选的布尔属性对对象数组进行排序，而不需要强制解包 [英] swift - sort an array of objects by their optional boolean property without force unwrapping

问题描述

我可以通过'旗舰'布尔属性对这个商店对象数组进行排序，但是如何才能安全地首先打开'旗舰'属性呢？

I can sort this array of store objects by their 'flagship' boolean property, but how can I safely unwrap the 'flagship' property first?

let flagshipStores = self.stores.sort {
    $0.flagship! && !$1.flagship!
}

推荐答案

let flagshipStores = self.stores.sort {
    guard let flagship0 = $0.flagship, let flagship1 = $1.flagship else { return false }
    return flagship0 && !flagship1
}

这篇关于swift - 通过可选的布尔属性对对象数组进行排序，而不需要强制解包的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！