Am trying to downcast a view controller to a detail view controller but can't. Am using Core Data (for the first time). The error is in the prepareForSegue method and reads: "Could not cast value of type 'UIViewController' (0x1b81cdc) to 'Patternz.PatternDetailViewController' (0x32488). (lldb) "Am trying to downcast a view controller to a de
阅读背景：
无法将类型为UIViewController的值转换为PatternDetailViewController
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