"Expression of type "UIViewController?" is unused".
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func backVC(){
self.navigationController?.popViewController(animated:true)
}
运行时的时候报警告"Expression of type "UIViewController?" is unused".
主要是swift2都有一个默认可以废弃的结果
在swift3.0情况下修改方式如下
func backVC(){
_ = self.navigationController?.popViewController(animated:true)
}
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