ScrollView 中的 TextView 粘在键盘上
TextView inside ScrollView stick to keyboard
我有一个 UIScrollView
和里面的内容。内容里面有一个UITextView
。当用户按下 UITextView
我想要 UITextView
粘在键盘上。
图中:
整个事情是 UIScrollView
底部黑色区域为可视屏幕
红色区域为内容
蓝色区域为UITextView
绿色距离是内容和屏幕边界之间的动态边距。
我想计算用户可以看到的绿色距离以及用户可以看到的蓝色区域(UITextView
)。如果用户滑动一半 UITextView
,UITextView
应该仍然粘在键盘上。
let userInfo = notification.userInfo!
let keyboardEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
let keyboardBeginFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as UInt
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as Double
let options = UIViewAnimationOptions(curve << 16)
UIView.animateWithDuration(duration, delay: 0, options: options,
animations: {
var visibleGreen = ???
var visibleBlue = ???
var amountToSubtract = visibleGreen + visibleBlue
var newFrame = (self.currentCardInstance?.newCommentCell.frame)!
var kbFrameEnd = self.view.convertRect(keyboardEndFrame, toView: nil)
var kbFrameBegin = self.view.convertRect(keyboardBeginFrame, toView: nil)
newFrame.origin.y -= kbFrameBegin.origin.y - kbFrameEnd.origin.y + amountToSubtract
self.currentCardInstance?.newCommentCell.frame = newFrame;
},
completion: nil
)
我是这样解决的:
var keyboardModifier: CGFloat = 0
func keyboardWillAppear(notification: NSNotification) {
println("keyboardWillAppear")
keyboardResize(notification: notification)
scrollToBottom()
}
func keyboardWillDisappear(notification: NSNotification) {
println("keyboardWillDisappear")
keyboardResize(notification: notification)
}
func keyboardResize(#notification: NSNotification) {
let userInfo = notification.userInfo!
let keyboardEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
let keyboardBeginFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as UInt
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as Double
let options = UIViewAnimationOptions(curve << 16)
var newFrame = (self. currentCardInstance?.frame)!
var kbFrameEnd = self.view.convertRect(keyboardEndFrame, toView: nil)
var kbFrameBegin = self.view.convertRect(keyboardBeginFrame, toView: nil)
keyboardModifier = kbFrameBegin.origin.y - kbFrameEnd.origin.y
scrollView.frame.size.height -= keyboardModifier
}
func scrollToBottom() {
var bottomOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
scrollView.setContentOffset(bottomOffset, animated: false)
}
我有一个 UIScrollView
和里面的内容。内容里面有一个UITextView
。当用户按下 UITextView
我想要 UITextView
粘在键盘上。
图中:
整个事情是 UIScrollView
底部黑色区域为可视屏幕
红色区域为内容
蓝色区域为UITextView
绿色距离是内容和屏幕边界之间的动态边距。
我想计算用户可以看到的绿色距离以及用户可以看到的蓝色区域(UITextView
)。如果用户滑动一半 UITextView
,UITextView
应该仍然粘在键盘上。
let userInfo = notification.userInfo!
let keyboardEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
let keyboardBeginFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as UInt
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as Double
let options = UIViewAnimationOptions(curve << 16)
UIView.animateWithDuration(duration, delay: 0, options: options,
animations: {
var visibleGreen = ???
var visibleBlue = ???
var amountToSubtract = visibleGreen + visibleBlue
var newFrame = (self.currentCardInstance?.newCommentCell.frame)!
var kbFrameEnd = self.view.convertRect(keyboardEndFrame, toView: nil)
var kbFrameBegin = self.view.convertRect(keyboardBeginFrame, toView: nil)
newFrame.origin.y -= kbFrameBegin.origin.y - kbFrameEnd.origin.y + amountToSubtract
self.currentCardInstance?.newCommentCell.frame = newFrame;
},
completion: nil
)
我是这样解决的:
var keyboardModifier: CGFloat = 0
func keyboardWillAppear(notification: NSNotification) {
println("keyboardWillAppear")
keyboardResize(notification: notification)
scrollToBottom()
}
func keyboardWillDisappear(notification: NSNotification) {
println("keyboardWillDisappear")
keyboardResize(notification: notification)
}
func keyboardResize(#notification: NSNotification) {
let userInfo = notification.userInfo!
let keyboardEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
let keyboardBeginFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as NSValue).CGRectValue()
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as UInt
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as Double
let options = UIViewAnimationOptions(curve << 16)
var newFrame = (self. currentCardInstance?.frame)!
var kbFrameEnd = self.view.convertRect(keyboardEndFrame, toView: nil)
var kbFrameBegin = self.view.convertRect(keyboardBeginFrame, toView: nil)
keyboardModifier = kbFrameBegin.origin.y - kbFrameEnd.origin.y
scrollView.frame.size.height -= keyboardModifier
}
func scrollToBottom() {
var bottomOffset = CGPoint(x: 0, y: scrollView.contentSize.height - scrollView.bounds.size.height)
scrollView.setContentOffset(bottomOffset, animated: false)
}