Attempt to present <TestViewController2: 0x7fd7f8d10f30> on <ViewController: 0x7fd7f8c054c0> whose view is not in the window hierarchy!
2018-06-15 00:15
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当 storyboard里面的 按钮 即连接了 类文件里面的点击方法 又 连接了 storyboard里 另一个 控制器的 modal
就会出现类似Attempt to present <TestViewController2: 0x7fd7f8d10f30> on <ViewController: 0x7fd7f8c054c0> whose view is not in the window hierarchy!的错误 ，意思是说系统尝试present一个没有在window的层级结构内 存在view的控制器
需要去掉一个方法，不要对一个按钮通过不同形式重复add不同的方法。这样会冲突。
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