'#selector' does not refer to an '@objc' method,No method declared with Objective-C selector 'compos
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swift3中，添加事件的selector时
action:#selector(“composeBtnClick”)和
action:(“composeBtnClick”)都会出错
正确的写法是 action :#selector(MainViewController.composeBtnClick)
然后在方法composeBtnClick添加
@objc阅读全文
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