[英]How to use AutoLayout programmatically with subviews inside a UITextView as the text position changes dynamically when the UITextView resizes
[英]UITextView changes position when all text selected
我創建了跟隨鍵盤的UITextView
的子類(例如在聊天應用程序中)。 我將UITextView
放置在界面生成器中的任意位置,並在代碼中初始化它的位置。 除非我在視圖中選擇了所有文本,否則一切都會正常工作,它會返回到界面生成器中的原始隨機位置。 我正在iOS模擬器中測試我的應用程序。 這是我的代碼:
class MessageTextView : UITextView
{
override func awakeFromNib()
{
super.awakeFromNib()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardStateChanged:", name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardDidHide:", name: UIKeyboardDidHideNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardDidHide:", name: UIKeyboardDidChangeFrameNotification, object: nil)
backgroundColor = UIColor.greenColor()
}
func keyboardFrameChanged(notification : NSNotification)
{
println("Keyboard frame changed")
let rect = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey]?.CGRectValue())!
frame = CGRect(x: rect.minX, y: rect.minY - 100, width: rect.maxX, height: 100)
}
func keyboardDidHide(notification : NSNotification?)
{
println("Keyboard hided")
let size = UIScreen.mainScreen().bounds;
frame = CGRect(x: 0, y: size.height - 100, width: size.width, height: 100)
}
func keyboardStateChanged(notification : NSNotification)
{
println("Keyboard showed")
let rect = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey]?.CGRectValue())!
frame = CGRect(x: rect.minX, y: rect.minY - 100, width: rect.maxX, height: 100)
}
}
為什么會有這個問題,我該如何解決? 還是僅僅是iOS或iOS模擬器中的錯誤?
正如@rdelmar所建議的那樣,只需在情節提要中關閉自動布局即可解決此問題。
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