抱歉，如果这看起来不太好，但我是第一次尝试编程并且还在学习。 这是我的代码:
func textFieldDidBeginEditing(_ textField: UITextField) {
var heightOfKeyboard = CGFloat(0.0)
UIView.animate(withDuration: 0.5) {
func keyboardWillShow(_ notification: Notification) {
if let keyboardFrame: NSValue = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
let keyboardRectangle = keyboardFrame.cgRectValue
let keyboardHeight = keyboardRectangle.height
heightOfKeyboard = keyboardHeight
}
}
print(heightOfKeyboard)
self.heightConstraint.constant = heightOfKeyboard + CGFloat(50)
self.view.layoutIfNeeded()
}
}
在我的控制台输出中，我得到 heighOfKeyboard 仍然是 0.0，我认为这是因为方法 textFieldDidBeginEditing 在 keyboardWillShow 之前被触发。如何在触发 textFieldDidBeginEditing 之前让 heightOfKeyboard 获取 keyboardHeight 的值？
感谢您的回答!!
最佳答案
你可以把所有的东西都展示出来
func keyboardWillShow(_ notification: Notification) {
if let keyboardFrame: NSValue = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
let keyboardRectangle = keyboardFrame.cgRectValue
let keyboardHeight = keyboardRectangle.height
print(keyboardHeight )
self.heightConstraint.constant = keyboardHeight + CGFloat(50)
UIView.animate(withDuration: 0.5) {
self.view.layoutIfNeeded()
}
}
}
关于ios - 根据键盘高度更新文本字段的约束，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48952391/