当视图已经加载时，如何在出现键盘的情况下打开视图?
问题描述：
我需要在视图中有文本框的地方.当我想通过切换选项卡(基于Tab的应用程序)打开视图时，第一次加载视图时会出现键盘，因为调用了loadview方法.但是，当我切换到tab2并再次切换到tab1时，不会调用加载视图.我希望每次打开tab1页面时都出现键盘.
I have a requirement where I have a textfield in a view. When I want to open the view by switching the tab (TabBased Application), first time when the view is loaded the keyboard appears because i loadview method is called. But when I switch to tab2 and again switch to tab1 again, load view is not called. I want the keyboard to appear every time I open the tab1 page.
答
在视图控制器中使用 -viewWillAppear:向您的文本字段发送 -becomeFirstResponder 消息，例如:
Use -viewWillAppear: in your view controller to send your text field a -becomeFirstResponder message, e.g.:
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[myTextField becomeFirstResponder];
}