當(dāng)鍵盤出現(xiàn)時 - 如何開始編輯時，如何讓UITextField向上移動？使用iOS SDK：我有一個UIView帶有UITextField鍵盤的s。我需要它能夠：UIScrollView一旦鍵盤出現(xiàn)，允許滾動內(nèi)容以查看其他文本字段自動“跳躍”（通過向上滾動）或縮短我知道我需要一個UIScrollView。我已經(jīng)嘗試將我的類更改UIView為a UIScrollView但我仍然無法向上或向下滾動文本框。我需要a UIView和a UIScrollView嗎？一個人進(jìn)去另一個嗎？需要實現(xiàn)什么才能自動滾動到活動文本字段？理想情況下，盡可能多的組件設(shè)置將在Interface Builder中完成。我只想編寫需要它的代碼。注意：我正在使用的UIView（或UIScrollView）是由tabbar（UITabBar）啟動的，它需要正常運行。編輯：我正在添加滾動條，僅用于鍵盤出現(xiàn)時。即使它不需要，我覺得它提供了更好的界面，因為用戶可以滾動和更改文本框。我已經(jīng)讓它工作，我改變UIScrollView了鍵盤上下的框架大小。我只是使用：-(void)textFieldDidBeginEditing:(UITextField *)textField {
//Keyboard becomes visible
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y, scrollView.frame.size.width,scrollView.frame.size.height - 215 + 50);
//resize}-(void)textFieldDidEndEditing:(UITextField *)textField {
//keyboard will hide
scrollView.frame = CGRectMake(scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.frame.size.width,
scrollView.frame.size.height + 215 - 50); //resize}但是，這不會自動“向上移動”或?qū)⒖梢妳^(qū)域中的下部文本字段居中，這是我真正想要的。
4 回答
狐的傳說
TA貢獻(xiàn)1804條經(jīng)驗 獲得超3個贊
實際上，最好只使用Apple的實現(xiàn)，如文檔中所提供的那樣。但是，他們提供的代碼是錯誤的。將keyboardWasShown:評論下方的部分替換為以下內(nèi)容：
NSDictionary* info = [aNotification userInfo];
CGRect keyPadFrame=[[UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue] fromView:self.view];
CGSize kbSize =keyPadFrame.size;
CGRect activeRect=[self.view convertRect:activeField.frame fromView:activeField.superview];
CGRect aRect = self.view.bounds;
aRect.size.height -= (kbSize.height);
CGPoint origin = activeRect.origin;
origin.y -= backScrollView.contentOffset.y;
if (!CGRectContainsPoint(aRect, origin)) {
CGPoint scrollPoint = CGPointMake(0.0,CGRectGetMaxY(activeRect)-(aRect.size.height));
[backScrollView setContentOffset:scrollPoint animated:YES];
}
Apple代碼的問題是這些：（1）它們總是計算點是否在視圖的框架內(nèi)，但它是a ScrollView，所以它可能已經(jīng)滾動，你需要考慮該偏移：
origin.y -= scrollView.contentOffset.y
（2）他們將contentOffset移動鍵盤的高度，但我們想要相反（我們想要移動contentOffset屏幕上可見的高度，而不是不是）：
activeField.frame.origin.y-(aRect.size.height)
汪汪一只貓
TA貢獻(xiàn)1898條經(jīng)驗 獲得超8個贊
在textFieldDidBeginEditting和textFieldDidEndEditing通話功能[self animateTextField:textField up:YES]，如下所示：
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
[self animateTextField:textField up:YES]; }- (void)textFieldDidEndEditing:(UITextField *)textField{
[self animateTextField:textField up:NO];}-(void)animateTextField:(UITextField*)textField up:(BOOL)up{
const int movementDistance = -130; // tweak as needed
const float movementDuration = 0.3f; // tweak as needed
int movement = (up ? movementDistance : -movementDistance);
[UIView beginAnimations: @"animateTextField" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
self.view.frame = CGRectOffset(self.view.frame, 0, movement);
[UIView commitAnimations];}我希望這段代碼可以幫到你。
在Swift 2中
func animateTextField(textField: UITextField, up: Bool) {
let movementDistance:CGFloat = -130
let movementDuration: Double = 0.3
var movement:CGFloat = 0
if up
{
movement = movementDistance }
else
{
movement = -movementDistance }
UIView.beginAnimations("animateTextField", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(movementDuration)
self.view.frame = CGRectOffset(self.view.frame, 0, movement)
UIView.commitAnimations()}func textFieldDidBeginEditing(textField: UITextField) {
self.animateTextField(textField, up:true)}func textFieldDidEndEditing(textField: UITextField) {
self.animateTextField(textField, up:false)}SWIFT 3
func animateTextField(textField: UITextField, up: Bool)
{
let movementDistance:CGFloat = -130
let movementDuration: Double = 0.3
var movement:CGFloat = 0
if up {
movement = movementDistance }
else
{
movement = -movementDistance }
UIView.beginAnimations("animateTextField", context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(movementDuration)
self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
UIView.commitAnimations()
}
func textFieldDidBeginEditing(textField: UITextField)
{
self.animateTextField(textField: textField, up:true)
}
func textFieldDidEndEditing(textField: UITextField)
{
self.animateTextField(textField: textField, up:false)
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