小编Mic*_*ael的帖子

食谱

• recipeID:Int
• recipeName:String

我有一个带有属性recipeID的实体配方.如何在Swift中将max(recipeID)作为Int值？

我很快,请帮助我.提前致谢.

func fetchMaxID() {
    let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
    let fetchRequest = NSFetchRequest(entityName: "Recipe")

    fetchRequest.fetchLimit = 1
    let sortDescriptor = NSSortDescriptor(key: "recipeID", ascending: false)
    fetchRequest.sortDescriptors = [sortDescriptor]
    do {
        let maxID = try [managedObjectContext?.executeFetchRequest(fetchRequest)].first
        print(maxID)
    } catch _ {

    }
}