ios - 在 textFieldShouldBeginEditing 委托(delegate)中获取键盘大小

Question

我在创建消息传递应用程序时遇到问题，当打开键盘时，我不确定键盘的总大小和框架(字典区域是否打开)。
我想获得总尺寸和框架

textFieldShouldBeginEditing

代表。

Answer 1

您应该使用 UIKeyboardWillChangeFrameNotification 。还要确保将 CGRect 转换为正确的 View ，以供横向使用。

在你的 textFieldShouldBeginEditing 中设置 NSNotificationCenter

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

并编写此方法。

- (void)keyboardWillChange:(NSNotification *)notification {
    CGRect keyboardRect = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    keyboardRect = [self.view convertRect:keyboardRect fromView:nil]; //this is it!
}

在 swift 4

 NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(_noti:) ), name: NSNotification.Name.UIKeyboardWillChangeFrame , object: nil)

KeyboardWillChange 方法

@objc func keyboardWillChange(_noti:NSNotification)
{
    let keyBoard = _noti.userInfo
    let keyBoardValue = keyBoard![UIKeyboardFrameEndUserInfoKey]
    let fram = keyBoardValue as? CGRect // this is frame
}