协议没有从容器中挣脱

Question

我有一个ViewController，其中有两个重叠ContainerViews。从其中一个子视图我想将标签更改为另一个。

我创建了一个协议：

protocol pickerDelegate {
    func changeMainContainer(index:Int)
}

在儿童观点中：

class ChildViewInContainerController: UIViewController, UIPickerViewDelegate {
    var delegateStorePicker:storePickerDelegate?
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        self.delegatePicker?.changeMainContainer(0)
    }
}

在主视图中：

class MainViewController: UIViewController, storePickerDelegate {
    func changeMainContainer(index:Int) {
        switch index {
            case 0 :
                self.container1.hidden = true
                self.container2.hidden = false
            case 1:
                self.container1.hidden = false
                self.container2.hidden = true
            default: break;
        }
    }
}

代码有效，但未调用changeMainContainer函数。

Answer 1

协议:(注意我改变了符合using (XLWorkbook wb = new XLWorkbook()) { wb.Worksheets.Add(dt1); Response.Clear(); Response.Buffer = true; Response.Charset =""; Response.ContentType = "application/vnd.openxmlformats- officedocument.spreadsheetml.sheet"; //Response.AddHeader("content-disposition", "attachment;filename=GridView.xlsx"); Response.AddHeader("content-disposition", "attachment;filename=" + filename); using (MemoryStream MyMemoryStream = new MemoryStream()) { wb.SaveAs(MyMemoryStream); MyMemoryStream.WriteTo(Response.OutputStream); Response.Flush(); Response.End(); } 的协议）

class

ChildView :(将您的委托更改为弱变量）

protocol PickerDelegate: class {
    func changeMainContainer(index:Int)
}

主要观点：

class ChildViewInContainerController: UIViewController, UIPickerViewDelegate {
    weak var delegateStorePicker: PickerDelegate?
}

使代表弱会阻止强大的参考周期。