经过大量的试验和错误,我放弃了,并提出了这个问题。我见过很多人有类似的问题,但不能得到所有的答案工作正确。
我有一个由自定义单元格组成的UITableView。单元格由相邻的5个文本字段组成(有点像网格)。
当我试图滚动和编辑UITableView底部的单元格时,我不能设法让我的单元格正确地定位在键盘上方。
我看到过很多关于改变视图大小的回答……但到目前为止,没有一种效果很好。
谁能用一个具体的代码示例来阐明这样做的“正确”方式?
经过大量的试验和错误,我放弃了,并提出了这个问题。我见过很多人有类似的问题,但不能得到所有的答案工作正确。
我有一个由自定义单元格组成的UITableView。单元格由相邻的5个文本字段组成(有点像网格)。
当我试图滚动和编辑UITableView底部的单元格时,我不能设法让我的单元格正确地定位在键盘上方。
我看到过很多关于改变视图大小的回答……但到目前为止,没有一种效果很好。
谁能用一个具体的代码示例来阐明这样做的“正确”方式?
当前回答
使用UITextField的委托方法:
斯威夫特
func textFieldShouldBeginEditing(textField: UITextField) -> bool {
let txtFieldPosition = textField.convertPoint(textField.bounds.origin, toView: yourTableViewHere)
let indexPath = yourTablViewHere.indexPathForRowAtPoint(txtFieldPosition)
if indexPath != nil {
yourTablViewHere.scrollToRowAtIndexPath(indexPath!, atScrollPosition: .Top, animated: true)
}
return true
}
objective - c
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
CGPoint txtFieldPosition = [textField convertPoint:CGPointZero toView: yourTablViewHere];
NSLog(@"Begin txtFieldPosition : %@",NSStringFromCGPoint(txtFieldPosition));
NSIndexPath *indexPath = [yourTablViewHere indexPathForRowAtPoint:txtFieldPosition];
if (indexPath != nil) {
[yourTablViewHere scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}
return YES;
}
其他回答
这个解决方案为我工作,请注意这一行
[tableView setContentOffset:CGPointMake(0.0, activeField.frame.origin.y-kbSize.height+160) animated:YES];
您可以更改160值以使其与您的工作相匹配
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGRect bkgndRect = activeField.superview.frame;
bkgndRect.size.height += kbSize.height;
[activeField.superview setFrame:bkgndRect];
[tableView setContentOffset:CGPointMake(0.0, activeField.frame.origin.y-kbSize.height+160) animated:YES];
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
activeField = textField;
}
-(void)textFieldDidEndEditing:(UITextField *)textField
{
activeField = nil;
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
tableView.contentInset = contentInsets;
tableView.scrollIndicatorInsets = contentInsets;
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGRect bkgndRect = activeField.superview.frame;
//bkgndRect.size.height += kbSize.height;
[activeField.superview setFrame:bkgndRect];
[tableView setContentOffset:CGPointMake(0.0, activeField.frame.origin.y-kbSize.height) animated:YES];
}
非常有趣的讨论线程,我也面临着同样的问题,可能更糟糕的一个原因
我正在使用一个自定义单元格和文本字段在里面。 我不得不使用UIViewController来满足我的要求,所以不能利用UITableViewController。 我有过滤/排序标准在我的表格单元格,即你的单元格不断改变和跟踪indexpath和所有将没有帮助。
所以阅读这里的帖子并实现我的版本,这帮助我在iPad的横屏模式下提升我的内容。 这里是代码(这不是傻瓜证明,但它修复了我的问题) 首先,你需要在你的自定义单元格类中有一个委托,在编辑开始时,将文本字段发送到你的视图控制器,并设置activefield = theTextField
//只处理横向模式
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbValue = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGRect aRect = myTable.frame;
CGSize kbSize = CGSizeMake(kbValue.height, kbValue.width);
aRect.size.height -= kbSize.height+50;
// This will the exact rect in which your textfield is present
CGRect rect = [myTable convertRect:activeField.bounds fromView:activeField];
// Scroll up only if required
if (!CGRectContainsPoint(aRect, rect.origin) ) {
[myTable setContentOffset:CGPointMake(0.0, rect.origin.y) animated:YES];
}
}
//当发送UIKeyboardWillHideNotification时调用
- (void)keyboardWillHide:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
myTable.contentInset = contentInsets;
myTable.scrollIndicatorInsets = contentInsets;
NSDictionary* info = [aNotification userInfo];
CGSize kbValue = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGSize kbSize = CGSizeMake(kbValue.height, kbValue.width);
CGRect bkgndRect = activeField.superview.frame;
bkgndRect.size.height += kbSize.height;
[activeField.superview setFrame:bkgndRect];
[myTable setContentOffset:CGPointMake(0.0, 10.0) animated:YES];
}
-anoop4real
一个更加流线型的解决方案。它滑入UITextField委托方法,所以它不需要搞砸/ UIKeyboard通知。
实现注意事项:
kSettingsRowHeight——UITableViewCell的高度。
offsetTarget和offsetThreshold基于kSettingsRowHeight。如果使用不同的行高,则将这些值设置为point的y属性。[alt:以不同的方式计算行偏移量。]
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
CGFloat offsetTarget = 113.0f; // 3rd row
CGFloat offsetThreshold = 248.0f; // 6th row (i.e. 2nd-to-last row)
CGPoint point = [self.tableView convertPoint:CGPointZero fromView:textField];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
CGRect frame = self.tableView.frame;
if (point.y > offsetThreshold) {
self.tableView.frame = CGRectMake(0.0f,
offsetTarget - point.y + kSettingsRowHeight,
frame.size.width,
frame.size.height);
} else if (point.y > offsetTarget) {
self.tableView.frame = CGRectMake(0.0f,
offsetTarget - point.y,
frame.size.width,
frame.size.height);
} else {
self.tableView.frame = CGRectMake(0.0f,
0.0f,
frame.size.width,
frame.size.height);
}
[UIView commitAnimations];
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
CGRect frame = self.tableView.frame;
self.tableView.frame = CGRectMake(0.0f,
0.0f,
frame.size.width,
frame.size.height);
[UIView commitAnimations];
return YES;
}
键盘通知可以工作,但苹果的示例代码假设滚动视图是窗口的根视图。通常情况并非如此。您必须补偿标签栏等,以获得正确的偏移量。
这比听起来容易。下面是我在UITableViewController中使用的代码。它有两个实例变量,hiddenRect和keyboardshow。
// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification {
if (keyboardShown)
return;
NSDictionary* info = [aNotification userInfo];
// Get the frame of the keyboard.
NSValue *centerValue = [info objectForKey:UIKeyboardCenterEndUserInfoKey];
NSValue *boundsValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
CGPoint keyboardCenter = [centerValue CGPointValue];
CGRect keyboardBounds = [boundsValue CGRectValue];
CGPoint keyboardOrigin = CGPointMake(keyboardCenter.x - keyboardBounds.size.width / 2.0,
keyboardCenter.y - keyboardBounds.size.height / 2.0);
CGRect keyboardScreenFrame = { keyboardOrigin, keyboardBounds.size };
// Resize the scroll view.
UIScrollView *scrollView = (UIScrollView *) self.tableView;
CGRect viewFrame = scrollView.frame;
CGRect keyboardFrame = [scrollView.superview convertRect:keyboardScreenFrame fromView:nil];
hiddenRect = CGRectIntersection(viewFrame, keyboardFrame);
CGRect remainder, slice;
CGRectDivide(viewFrame, &slice, &remainder, CGRectGetHeight(hiddenRect), CGRectMaxYEdge);
scrollView.frame = remainder;
// Scroll the active text field into view.
CGRect textFieldRect = [/* selected cell */ frame];
[scrollView scrollRectToVisible:textFieldRect animated:YES];
keyboardShown = YES;
}
// Called when the UIKeyboardDidHideNotification is sent
- (void)keyboardWasHidden:(NSNotification*)aNotification
{
// Reset the height of the scroll view to its original value
UIScrollView *scrollView = (UIScrollView *) self.tableView;
CGRect viewFrame = [scrollView frame];
scrollView.frame = CGRectUnion(viewFrame, hiddenRect);
keyboardShown = NO;
}
因此,经过数小时的艰苦工作,尝试使用这些当前的解决方案(完全失败),我终于让事情正常工作,并更新它们以使用新的动画块。我的回答完全基于Ortwin上面的回答。
所以不管出于什么原因,上面的代码就是不适合我。我的设置似乎和其他人的很相似,但可能是因为我用的是iPad或4.3……不知道。它在做一些古怪的数学运算然后把我的tableview从屏幕上拍下来。
见我的解决方案的最终结果:http://screencast.com/t/hjBCuRrPC(请忽略照片。: - p)
所以我沿用了Ortwin的基本原理,但改变了计算原点的方法。Y和尺寸。我的表格视图的高度和键盘的高度。当我从结果中减去窗口的高度时,它告诉我有多少交集。如果它大于0(也就是有一些重叠),我执行帧高度的动画。
此外,还有一些重绘问题得到了解决,1)等待滚动到单元格直到动画完成,2)使用UIViewAnimationOptionBeginFromCurrentState选项隐藏键盘。
有几件事需要注意。
_topmostrowbeforekeyboardwasshow & _originalFrame是在头文件中声明的实例变量。 自我。guestEntryTableView是我的tableView(我在外部文件中) iaskcgrecswap是Ortwin用于翻转帧坐标的方法 我只更新tableView的高度如果它至少有50px会显示 因为我不在UIViewController中,所以我没有self。视图,我只是把tableView返回到它的原始框架
同样,如果我Ortwin没有提供关键,我也不会得到这个答案。代码如下:
- (IBAction)textFieldDidBeginEditing:(UITextField *)textField
{
self.activeTextField = textField;
if ([self.guestEntryTableView indexPathsForVisibleRows].count) {
_topmostRowBeforeKeyboardWasShown = (NSIndexPath*)[[self.guestEntryTableView indexPathsForVisibleRows] objectAtIndex:0];
} else {
// this should never happen
_topmostRowBeforeKeyboardWasShown = [NSIndexPath indexPathForRow:0 inSection:0];
[textField resignFirstResponder];
}
}
- (IBAction)textFieldDidEndEditing:(UITextField *)textField
{
self.activeTextField = nil;
}
- (void)keyboardWillShow:(NSNotification*)notification {
NSDictionary* userInfo = [notification userInfo];
NSValue* keyboardFrameValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
// Reduce the tableView height by the part of the keyboard that actually covers the tableView
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
CGRect windowRect = [[UIApplication sharedApplication] keyWindow].bounds;
CGRect viewRectAbsolute = [self.guestEntryTableView convertRect:self.guestEntryTableView.bounds toView:[[UIApplication sharedApplication] keyWindow]];
CGRect keyboardFrame = [keyboardFrameValue CGRectValue];
if (UIInterfaceOrientationLandscapeLeft == orientation ||UIInterfaceOrientationLandscapeRight == orientation ) {
windowRect = IASKCGRectSwap(windowRect);
viewRectAbsolute = IASKCGRectSwap(viewRectAbsolute);
keyboardFrame = IASKCGRectSwap(keyboardFrame);
}
// fix the coordinates of our rect to have a top left origin 0,0
viewRectAbsolute = FixOriginRotation(viewRectAbsolute, orientation, windowRect.size.width, windowRect.size.height);
CGRect frame = self.guestEntryTableView.frame;
_originalFrame = self.guestEntryTableView.frame;
int remainder = (viewRectAbsolute.origin.y + viewRectAbsolute.size.height + keyboardFrame.size.height) - windowRect.size.height;
if (remainder > 0 && !(remainder > frame.size.height + 50)) {
frame.size.height = frame.size.height - remainder;
float duration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration: duration
animations:^{
self.guestEntryTableView.frame = frame;
}
completion:^(BOOL finished){
UITableViewCell *textFieldCell = (UITableViewCell*) [[self.activeTextField superview] superview];
NSIndexPath *textFieldIndexPath = [self.guestEntryTableView indexPathForCell:textFieldCell];
[self.guestEntryTableView scrollToRowAtIndexPath:textFieldIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}];
}
}
- (void)keyboardWillHide:(NSNotification*)notification {
NSDictionary* userInfo = [notification userInfo];
float duration = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration: duration
delay: 0.0
options: (UIViewAnimationOptionBeginFromCurrentState)
animations:^{
self.guestEntryTableView.frame = _originalFrame;
}
completion:^(BOOL finished){
[self.guestEntryTableView scrollToRowAtIndexPath:_topmostRowBeforeKeyboardWasShown atScrollPosition:UITableViewScrollPositionTop animated:YES];
}];
}
#pragma mark CGRect Utility function
CGRect IASKCGRectSwap(CGRect rect) {
CGRect newRect;
newRect.origin.x = rect.origin.y;
newRect.origin.y = rect.origin.x;
newRect.size.width = rect.size.height;
newRect.size.height = rect.size.width;
return newRect;
}
CGRect FixOriginRotation(CGRect rect, UIInterfaceOrientation orientation, int parentWidth, int parentHeight) {
CGRect newRect;
switch(orientation)
{
case UIInterfaceOrientationLandscapeLeft:
newRect = CGRectMake(parentWidth - (rect.size.width + rect.origin.x), rect.origin.y, rect.size.width, rect.size.height);
break;
case UIInterfaceOrientationLandscapeRight:
newRect = CGRectMake(rect.origin.x, parentHeight - (rect.size.height + rect.origin.y), rect.size.width, rect.size.height);
break;
case UIInterfaceOrientationPortrait:
newRect = rect;
break;
case UIInterfaceOrientationPortraitUpsideDown:
newRect = CGRectMake(parentWidth - (rect.size.width + rect.origin.x), parentHeight - (rect.size.height + rect.origin.y), rect.size.width, rect.size.height);
break;
}
return newRect;
}