什么类型返回executeFetchRequest

Question

我正在尝试从CoreData获取实体：

var request = NSFetchRequest(entityName: "Themes")
        request.returnsObjectsAsFaults = false
        var results = context.executeFetchRequest(request, error: nil)
        if results.count > 0 {}

但我得到error '[AnyObject]?' does not have a member named 'count' 如何访问结果中的每个实体？

Answer 1

results是可选的，这意味着您首先需要打开它。尝试使用这样：

if let results = context.executeFetchRequest(request, error: nil) {
    if results.count > 0 {}
}