Question

扩展元素{

git checkout -b <branch>

}

这里我想比较使用NSPredicate的pageId。我该怎么做？我尝试了以下内容。

案例1：

@nonobjc public class func fetchRequest() -> NSFetchRequest<Element> {
    return NSFetchRequest<Element>(entityName: "Element");
}

@NSManaged public var elementId: Int32
@NSManaged public var elementName: String?
@NSManaged public var elementText: String?
@NSManaged public var pageId: Int32
@NSManaged public var sortOrder: Int32

案例2：

elementFetch.predicate = NSPredicate(format: "pageId == %@","1")

var Data = try moc.fetch(elementFetch as! NSFetchRequest<NSFetchRequestResult>) as! [Element]

案例3：

elementFetch.predicate = NSPredicate(format: "pageId == %i",1)
var Data = try moc.fetch(elementFetch as! NSFetchRequest<NSFetchRequestResult>) as! [Element]

没有一个案例有效。我无法找到关于此谓词的任何文档，尤其是比较INT32

请帮忙

Answer 1

字面值非常简单

elementFetch.predicate = NSPredicate(format: "pageId == 1")

谓词来比较Int32

1 个答案: