iOS App 在 segue 崩溃(断点出现在 func prepareForSegue 处)

Question

更新:我发现，仅通过阅读代码很难调试，尤其是在这种情况下，https://www.dropbox.com/s/ty3clsvgednzevj/LoaferMap%20for%20iPhone%20copy%202.zip?dl=0 ，所以如果您想重现该错误，我会将我的项目上传到保管箱。我删除了 destination.delete(self)，现在它不见了。但是应用程序仍然崩溃。我意识到 SliderViewController 中的问题，也许我编写的代码根本无法执行。我是初学者，是快速编程语言的新手。您的帮助对我来说意义重大。

If you download my project, and look at it. My goal is actually pretty straightforward, you use a slider to select a travel radius, and there are long lines of code generates a random location based on my current location. And finally pass that code to destinationViewController, to display a flyover animation based on the new generated location. But right now I think everything is set up correctly, but the app still crushes.

当我要从一个 View 转换到下一个 View 时，我的应用程序崩溃了。

     override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
         if (segue.identifier == "sendLocationdata") {
             let destination = segue.destinationViewController as! DestinationViewController

Thread 1, Breakpoint 1.1

   destination.latitude = latitude
   destination.longitude = longitude
          }

更多源代码在VC，下一个VC，你可以查看我问的另一个问题How to Pass Data from View Controllers? .

Answer 1

segue.destinationViewController

不是 destinationViewController这个类是一个 UINavigationController

你必须给 UINavigationController 的 rootViewController 设置经纬度

请这样编辑