Using Xcode 7.0 and Swift 2
使用Xcode 7.0和Swift 2
I am trying to execute a fetchrequest in CoreData but is not working.
我正在尝试在CoreData中执行fetchrequest，但是没有工作。
Getting the below error. Not sure what the issue is. "segmentedControl" is an outlet from a segmentedControl view.
得到以下错误。不知道这个问题是什么。“segmentedControl”是一个来自segmentedControl视图的出口。
The strange bit is that I have used similar code in another sample project and there were no issues. Below is that code snippet
奇怪的是，我在另一个示例项目中使用了类似的代码，没有问题。下面是代码片段
I have used the execute fetchrequest syntax based on this post
基于本文，我使用了execute fetchrequest语法
1 个解决方案
#1
1
Use breakpoints or print statements to examine the value of firstTitle!. If it is not a string, and title in your entity is not defined as a String type, you will get this error.
使用断点或打印语句检查firstTitle的值!如果它不是字符串，并且实体中的标题没有定义为字符串类型，您将得到这个错误。
Also, make sure that your segmented control is set up as expected.
另外，确保您的分段控件按照预期设置。
#1
1
Use breakpoints or print statements to examine the value of firstTitle!. If it is not a string, and title in your entity is not defined as a String type, you will get this error.
使用断点或打印语句检查firstTitle的值!如果它不是字符串，并且实体中的标题没有定义为字符串类型，您将得到这个错误。
Also, make sure that your segmented control is set up as expected.
另外，确保您的分段控件按照预期设置。