问题描述
我想在显示键盘时向上移动视图.键盘(高度:216)应该用它的高度推高我的视野.这可以通过简单的代码实现吗?
I'd like to move up my view, when the keyboard is shown. The keyboard (height: 216) should push up my view with it's height. Is this possible with a simple code?
推荐答案
要移动视图上,只需改变它的center.首先,将原始的保存在 CGPoint 属性中.
To move the view up, just change its center. First, keep the original one in a CGPoint property.
- (void)viewDidLoad { ... self.originalCenter = self.view.center; ... }
然后,当键盘出现时根据需要进行更改:
Then, change as needed when keyboard shows up:
self.view.center = CGPointMake(self.originalCenter.x, /* new calculated y */);
最后,在键盘隐藏时恢复:
Finally, restore it when keyboard is hidden:
self.view.center = self.originalCenter;
随意添加动画糖
知道键盘何时出现的方法不止一种.
You have more than one way to know when the keyboard appears.
观察 UIKeyboardDidShowNotification 通知.
/* register notification in any of your initWithNibName:bundle:, viewDidLoad, awakeFromNib, etc. */ { ... [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil]; ... } - (void)keyboardDidShow:(NSNotification *)note { /* move your views here */ }
用 UIKeyboardDidHideNotification 做相反的事情.
-或-
实现 UITextFieldDelegate
在编辑开始/结束时检测以移动视图.
Detect when editing begin/end to move views around.
- (void)textFieldDidBeginEditing:(UITextField *)textField { /* keyboard is visible, move views */ } - (void)textFieldDidEndEditing:(UITextField *)textField { /* resign first responder, hide keyboard, move views */ }
根据您可能需要跟踪用户正在编辑哪个字段的实际文本字段,添加一个计时器以避免过多地移动视图.
Depending on the actual text fields you may need to track in which field is the user editing, add a timer to avoid moving views too much.