Xcode 9.3 - NSPredicate Bool崩溃 [英] Xcode 9.3 - NSPredicate Bool crash

问题描述

在Xcode 9.3更新之后，我注意到如果你想让Predicate像这样：

After the Xcode 9.3 update, I've noticed that if you want to have Predicate like this:

let predicate = NSPredicate(format: "preferred = %@", true as CVarArg)

您遇到了崩溃。但在Xcode 9.2中，这不是问题。有什么想法？

You have a crash. But in Xcode 9.2 this wasn't a problem. Any idea?

推荐答案

//解决方案3 [ Apple文档]

// Solution 3 [ Apple Documentation ]

let predicate = NSPredicate(format: "preferred == TRUE")

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发生异常是因为 true 不是对象（％@ ）。你需要％d 占位符

---

The exception occurs because true is not an object (%@). You need the %d placeholder

let predicate = NSPredicate(format: "preferred = %d", true)

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