什么类型返回executeFetchRequest

Question

我想从CoreData那里得到一个实体

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

但我正在获得error '[AnyObject]?' does not have a member named 'count'，如何访问结果中的每个实体？

Answer 1

results是一个可选的，这意味着您首先需要打开它。试着像这样使用：

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