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[英]Keyboard is hiding text fields in UIScrollView. How to move the text field in accordance with the keyboard?
[英]How to move the focussed text field to the middle of the view after keyboard popups
在我的iPad中,我創建了SplitView
應用程序。 我有一個包含多行的UITableVewtable
,每行/單元格具有三個UITextField
當我點擊UITextField
某些字段會被鍵盤隱藏。
所以即時通訊使用TPKeyboardAvoidingScrollView框架,但它不適用於ios 5.0+.
有時無法滾動表上的滾動視圖。
所以我想每次都將聚焦的單元格移到鍵盤的中間/正上方
我應該使用什么?
提前致謝。
試試這個代碼。 把它放在你的.h文件中:
CGFloat animatedDistance;
在您的.m文件中:
static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 264;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 352;
在@interface myclass()之前添加此靜態const,您可以根據需要更改上述鍵盤高度值。 然后添加以下代碼:
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect textFieldRect =
[self.view.window convertRect:textField.bounds fromView:textField];
CGRect viewRect =
[self.view.window convertRect:self.view.bounds fromView:self.view];
CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size. height;
CGFloat denominator =
(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
if (heightFraction < 0.0)
{
heightFraction = 0.0;
}
else if (heightFraction > 1.0)
{
heightFraction = 1.0;
}
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait ||
orientation == UIInterfaceOrientationPortraitUpsideDown)
{
animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
}
else
{
animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
CGRect viewFrame = self.view.frame;
viewFrame.origin.y -= animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
CGRect viewFrame = self.view.frame;
viewFrame.origin.y += animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
您想要的是對視圖進行動畫處理,例如,當您觸摸textField時,它應該上升,而當您結束鍵入時,它應該下降。 您可以通過實現兩個UITextFiled
委托方法和一些小的動畫來實現此目的,如下所示:
- (void)textFieldDidEndEditing:(UITextField *)textField
{
[self startAnimatingTextField: textField up: NO];
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
[self startAnimatingTextField: textField up: YES];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.1];
[UIView setAnimationCurve: UIViewAnimationCurveLinear];
[UIView commitAnimations];
}
-(void)startAnimatingTextField:(UITextField *) textField up: (BOOL) up
{
const int distance = 120; /* modify conform your needs */
const float duration = 0.3f;
int movement = (up ? -movementDistance : movementDistance);
[UIView beginAnimations: @"anim" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
self.view.frame = CGRectOffset(self.view.frame, 0, movement);
[UIView commitAnimations];
}
希望這可以幫助 !
首先打開xib文件,並將Content insets(在Scrollview Size中)設置為200
現在,在.m文件中更新以下兩種方法。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cell=@"Cell";
Cell *customCell= (Cell *)[tableView dequeueReusableCellWithIdentifier:cell];
if (customCell==nil) {
NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:@"Cell" owner:self options:nil];
for (id object in bundle) {
if ([object isKindOfClass:[Cell class]])
{
customCell = (Cell *)object;
break;
}
}
}
customCell.IBTxtfield.tag=indexPath.row;
return customCell;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField{
NSIndexPath *path=[NSIndexPath indexPathForRow:textField.tag inSection:0];
[IBtblView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
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