Swift:如何创建带有 Int 值的谓词? [英] Swift: How do I create a predicate with an Int value?

问题描述

我在此语句中收到 EXC-BAD-ACCESS 错误:

I am getting an EXC-BAD-ACCESS error on this statement:

var thisPredicate = NSPredicate(format: "(sectionNumber == %@"), thisSection)

thisSection 的 Int 值为 1，当我将鼠标悬停在它上面时会显示值 1.但是在调试区我看到了这个:

thisSection has an Int value of 1 and displays the value 1 when I hover over it. But in the debug area I see this:

thisPredicate = (_ContiguousArrayStorage ...)

另一个使用字符串的谓词显示为 ObjectiveC.NSObject为什么会发生这种情况?

Another predicate using a String shows as ObjectiveC.NSObject Why is this happening?

推荐答案

当您的数据安全或经过消毒时，您可以尝试字符串插值 Swift 标准库参考.看起来像这样:

When your data is safe or sanitized, you might try String Interpolation Swift Standard Library Reference. That would look something like this:

let thisSection = 1
let thisPredicate = NSPredicate(format: "sectionNumber == (thisSection)")

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