通過segue進行數據傳輸

在viewControl中，加入-（void）prepareForSegue:(UIStoryBoardSegue *)segue sender: (id)sender方法，會在通過segue跳轉之前執行。

-（void）prepareForSegue:(UIStoryBoardSegue *)segue sender: (id)sender{
 id destController=segue.destinationViewController;//獲取segue將要跳轉到的目標視圖控制器
 destController setValue:self.label.text forKey:@"XXX"];//通過KVC方式將label內的文本設爲destController的XXX的屬性值
}

For example, if the segue originated from a table view, the sender parameter would identify the table view cell that the user tapped. You could use that information to set the data on the destination view controller.

當你點擊一個表格單元格進行segue跳轉，調用prepareForSegue方法時，sender參數就是你點擊的那個表格單元格，你可以用這個信息來設置目標VC的數據。

UIStoryBoardSegue有三個property，destinationViewController,sourceViewController,identifier.當一個viewController有多個segue並且要調用prepareForSegue時，通過identifier進行區分segue。

if you have a source view controller that can segue to two or more different destination view controllers, you would assign different identifiers to each segue so that the source view controller’s prepareForSegue:sender: method could tell them apart and prepare each segue appropriately.