iOS11没有正确地接受约束

Question

我在商店里有一个应用程序，为了支持所有的设备和键盘，我要根据键盘的高度改变底部的约束高度。它适用于所有iOS版本，但iOS11除外。按钮不改变其位置，如下图所示。

谢谢!

这是iOS10预览

​

这是iOS11预览

​

码

    func keyboardWillShow(notification: NSNotification) {
    if !keyboardIsHidden{
        return;
    }
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        keyboardIsHidden = false
        nextButtonBottmConstraint.constant = nextButtonBottmConstraint.constant + keyboardSize.height
    }
}

Answer 1

如果使用UIKeyboardWillShowNotification获取键盘高度，则使用UIKeyboardFrameEndUserInfoKey更改UIKeyboardFrameBeginUserInfoKey

UIKeyboardFrameBeginUserInfoKey返回iOS 11中键盘rect高度值为0。将其更改为UIKeyboardFrameEndUserInfoKey可能解决此问题。

目标-C

- (void)keyboardWasShown:(NSNotification*)aNotification {
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    //Change constraints
}

Swift 3

func keyboardWasShown(_ aNotification: Notification) {
    let info = aNotification.userInfo
    let kbSize: CGSize? = info?[UIKeyboardFrameEndUserInfoKey]?.cgRectValue?.size
    //Change constraints
}

Answer 2

Swift

使用IHKeyboardAvoiding

第一步)豆荚'IHKeyboardAvoiding‘

步骤2)复制以下代码

 import IHKeyboardAvoiding

  override func viewDidAppear(_ animated: Bool) {
    KeyboardAvoiding.avoidingView = Your_View
  }