iOS 获取键盘焦点并隐藏键盘
示例
获得焦点
迅速
textField.becomeFirstResponder()
目标C
[textField becomeFirstResponder];
辞职
迅速
textField.resignFirstResponder()
目标C
[textField resignFirstResponder];
获得焦点
textField.becomeFirstResponder()
[textField becomeFirstResponder];
辞职
textField.resignFirstResponder()
[textField resignFirstResponder];