1.NSMutableString *receiver = [[NSMutableString alloc] init];
[receiver appendFormat:@"%@",[self.receiverArray objectAtIndex:i]];
2.[self.textfield becomeFirstResponder] ->將焦點移到NSTextField上，這時虛擬鍵盤將會出現(xiàn)
[self.textfield resignFirstResponder] ->將焦點移出NSTextField，這時虛擬鍵盤將會關(guān)閉
becomeFirstResponder ->將焦點移動控件上
resignFirstResponder ->將焦點移出控件
3.viewWillAppear:
Called when the view is about to made visible. Default does nothing
視圖即將可見時調(diào)用。默認情況下不執(zhí)行任何操作
viewDidAppear:
Called when the view has been fully transitioned onto the screen. Default does nothing
視圖已完全過渡到屏幕上時調(diào)用
viewWillDisappear:
Called when the view is dismissed, covered or otherwise hidden. Default does nothing
視圖被駁回時調(diào)用，覆蓋或以其他方式隱藏。默認情況下不執(zhí)行任何操作
viewDidDisappear:
Called after the view was dismissed, covered or otherwise hidden. Default does nothing
視圖被駁回后調(diào)用，覆蓋或以其他方式隱藏。默認情況下不執(zhí)行任何操作
loadView;
This is where subclasses should create their custom view hierarchy if they aren't using a nib. Should never be called directly.
這是當他們沒有正在使用nib視圖頁面，子類將會創(chuàng)建自己的自定義視圖層。絕不能直接調(diào)用。
viewDidLoad;
Called
after the view has been loaded. For view controllers created in code,
this is after -loadView. For view controllers unarchived from a nib,
this is after the view is set.
在視圖加載后被調(diào)用，如果是在代碼中創(chuàng)建的視圖加載器，他將會在loadView方法后被調(diào)用，如果是從nib視圖頁面輸出，他將會在視圖設置好 后被調(diào)用。