出现Terminating app due to uncaught exception 'NSUnknownKeyException', reason: 错误的解决方法
2018-01-17 17:51
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出现这个的原因是：之前我为按钮添加了一个变量，但是在代码中又把这个变量给删除了，此时关联还在，所以在运行时找这个变量无法找到，所以会出现错误，那么此时就是选择这个变量所在的控件对象右键单击，在弹出的菜单中看是否还存在着关联，如果存在则将此关联删除，删除方法就是单击关联哪里的x号，如下图所示：
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