Block

1.block属性的定义：

var completeBtnClickBlock: (()->())?  // 无参block
var backNameBlock: ((String,String)->())?  // 含参block

2.block的调用：

//“完成”按钮点击
@IBAction func completeBtnAction(_ sender: Any) {
    guard self.completeBtnClickBlock != nil && self.backNameBlock != nil else {
        return
    }
    self.completeBtnClickBlock!()
    self.backNameBlock!("hushijie","hushituan")
}

3.block的实现

weak var weakSelf = self
paySuccessView.completeBtnClickBlock = { ()->() in
    weakSelf?.navigationController?.popViewController(animated: true)
}
paySuccessView.backNameBlock = { (name1,name2)->() in
    print(name1)
    print(name2)
}