NSFetchedResultsController - 排序为数字但字符串字段

Question

我正在从获取请求中返回一些数据，该字段存储为字符串。我想做的是对结果进行排序，使数字有序

let sortDescriptor = NSSortDescriptor(key: "number", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]

我要的顺序是 1,2,3,100, 200, 1544, White 实际字符串的开头或结尾并不重要（ End 是首选但不需要）

1, 100, 1544, 2, 3, 白色

Answer 1

var sortDescriptor = NSSortDescriptor(key: "title", ascending: true,
            selector: #selector(NSString.localizedStandardCompare))
fetchRequest.sortDescriptors = [sortDescriptor]

NSFetchedResultsController - 排序为数字但字符串字段

NSFetchedResultsController - sort as a number but string field

nssortdescriptor

swift