我正在构建一个具有常规设计和聊天应用 UI 的聊天应用。
我有一个我的应用程序需要的“工具栏”(0,0 375x66),我希望它在显示键盘时保持原样。它有 4 个约束:top: 0, leading: 0, trailing: 0, aspect-ratio: 125:22
我有一个 UICollectionView
(0,66 375x530),我想在显示键盘时像任何其他聊天应用程序一样滚动它。它有 4 个约束:顶部(到工具栏):0,前导:0,尾随:0,底部(到 newMessageView,我将在稍后解释):0
我有一个 UIView
,里面有一个 UITextField
。我们称它为 newMessageView
(0,596 375x71),它有 4 个约束:bottom: 0, leading: 0, trailing: 0, aspect-ratio: 375:71
现在,我正尝试在显示键盘时引入 newMessageView
应用程序。我正在尝试这样做:
@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y == 0{
self.newMessageViewBottomConstraint.constant += keyboardSize.height
}
}
}
@objc func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if self.view.frame.origin.y != 0{
self.newMessageViewBottomConstraint.constant -= keyboardSize.height
}
}
}
但它完全不起作用。 View 跳跃和隐藏,我真的不明白为什么。
我做的对吗?任何人都可以帮助我并指导我吗?
最佳答案
更新约束后必须使用self.view.layoutIfNeeded()
我为你写完整的解决方案
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
@objc func keyboardWillShow(notification: Notification) {
self.keyboardControl(notification, isShowing: true)
}
@objc func keyboardWillHide(notification: Notification) {
self.keyboardControl(notification, isShowing: false)
}
private func keyboardControl(_ notification: Notification, isShowing: Bool) {
/* Handle the Keyboard property of Default*/
var userInfo = notification.userInfo!
let keyboardRect = (userInfo[UIKeyboardFrameEndUserInfoKey]! as AnyObject).cgRectValue
let curve = (userInfo[UIKeyboardAnimationCurveUserInfoKey]! as AnyObject).uint32Value
let convertedFrame = self.view.convert(keyboardRect!, from: nil)
let heightOffset = self.view.bounds.size.height - convertedFrame.origin.y
let options = UIViewAnimationOptions(rawValue: UInt(curve!) << 16 | UIViewAnimationOptions.beginFromCurrentState.rawValue)
let duration = (userInfo[UIKeyboardAnimationDurationUserInfoKey]! as AnyObject).doubleValue
var pureheightOffset : CGFloat = -heightOffset
if isShowing { /// Wite space of save area in iphonex ios 11
if #available(iOS 11.0, *) {
pureheightOffset = pureheightOffset + view.safeAreaInsets.bottom
}
}
// Here change you Consrant
// self.actionBarPaddingBottomConstranit?.update(offset:pureheightOffset)
UIView.animate(
withDuration: duration!,
delay: 0,
options: options,
animations: {
self.view.layoutIfNeeded()
},
completion: { bool in
})
}
关于ios - 处理具有底部约束的键盘,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50171955/