经过大量的反复试验,我放弃并提出问题.我见过很多人有类似的问题,但无法得到所有正确的答案.
我有一个UITableView由自定义单元格组成的.单元格由5个文本字段组成,彼此相邻(有点像网格).
当我尝试滚动并编辑底部的单元格时UITableView,我无法将单元格正确放置在键盘上方.
我已经看到很多关于改变视图大小的答案......但到目前为止它们都没有很好地工作.
任何人都可以用具体的代码示例澄清"正确"的方法吗？
1> Sam Ho..：
如果您使用UITableViewController而不是UIViewController,它将自动执行此操作.
如果覆盖[super viewWillAppear:YES],它将无法工作.除此之外,它应该工作.
如果覆盖viewWillAppear:(BOOL)动画,请不要忘记调用[super viewWillAppear:animated]; :)
你试过,发现不工作了吗？或者解决方案太简单了吗？只需扩展UITableViewController而不是UIViewController,只要文本字段成为第一个响应者,包含文本字段的单元格就会在键盘上方滚动.无需额外代码.
要澄清一下,说每次使用tableview都需要全屏显示,这不是一个合理的答案,特别是在iPad上.有很多很棒的应用程序没有这样做的例子.例如,许多Apple自己的,包括iPad上的Contacts应用程序.
是的,但特别是在iPad上,我们需要一种不涉及UITableViewController的方法.
在100%的时间不起作用.我有自动滚动工作,现在突然它拒绝工作......
我也有这个问题.它过去自动工作,但现在不:(
2> 小智..：
滚动的功能可以更简单:
- (void) textFieldDidBeginEditing:(UITextField *)textField {
UITableViewCell *cell;
if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
// Load resources for iOS 6.1 or earlier
cell = (UITableViewCell *) textField.superview.superview;
} else {
// Load resources for iOS 7 or later
cell = (UITableViewCell *) textField.superview.superview.superview;
// TextField -> UITableVieCellContentView -> (in iOS 7!)ScrollView -> Cell!
}
[tView scrollToRowAtIndexPath:[tView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
而已.根本没有计算.
不适用于表视图的最后几行.键盘仍然会遮挡无法在键盘上方滚动的所有行.
通过对superview的一系列调用进入单元格是不可靠的,除非你确定你实际上是进入单元格.请参阅http://stackoverflow.com/a/17757851/1371070和http://stackoverflow.com/a/17758021/1371070
如果UITableViewController在显示键盘时已经处理了表格视图的大小调整,似乎无法工作:控制器使用`contentInset`减小了可见大小,当询问`visibleRows`或`时,它显然没有被考虑在内. indexPathsForVisibleRows`.
要使自动滚动行为在表的最后几行上起作用,请检测这些行何时开始编辑,并使用特定高度的空白视图将页脚添加到tableview的末尾.这将允许tableview将单元格滚动到正确的位置.
那么为何不？!只需用UITableViewScrollPositionMiddle替换UITableViewScrollPositionTop即可.当然,您只需要重新缩放UITableView以调整可见区域.
不要为superview的深度潜水,而是创建一个`UITextField`的子类并获取你的单元格类型的属性`UITableViewCell`.引用单元格到textfield(可能在`tableview:cellForRowAtIndexPath:`方法中).你可以在这里使用它,像这样,`[tView scrollToRowAtIndexPath:[tView indexPathForCell:textfield.cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];`
3> 小智..：
我正在做一些非常类似的通用,不需要为你的代码计算特定的东西.只需查看代码上的备注:
在MyUIViewController.h中
@interface MyUIViewController: UIViewController
{
UITableView *myTableView;
UITextField *actifText;
}
@property (nonatomic, retain) IBOutlet UITableView *myTableView;
@property (nonatomic, retain) IBOutlet UITextField *actifText;
- (IBAction)textFieldDidBeginEditing:(UITextField *)textField;
- (IBAction)textFieldDidEndEditing:(UITextField *)textField;
-(void) keyboardWillHide:(NSNotification *)note;
-(void) keyboardWillShow:(NSNotification *)note;
@end
在MyUIViewController.m中
@implementation MyUIViewController
@synthesize myTableView;
@synthesize actifText;
- (void)viewDidLoad
{
// Register notification when the keyboard will be show
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
// Register notification when the keyboard will be hide
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}
// To be link with your TextField event "Editing Did Begin"
// memoryze the current TextField
- (IBAction)textFieldDidBeginEditing:(UITextField *)textField
{
self.actifText = textField;
}
// To be link with your TextField event "Editing Did End"
// release current TextField
- (IBAction)textFieldDidEndEditing:(UITextField *)textField
{
self.actifText = nil;
}
-(void) keyboardWillShow:(NSNotification *)note
{
// Get the keyboard size
CGRect keyboardBounds;
[[note.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] getValue: &keyboardBounds];
// Detect orientation
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
CGRect frame = self.myTableView.frame;
// Start animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.3f];
// Reduce size of the Table view
if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
frame.size.height -= keyboardBounds.size.height;
else
frame.size.height -= keyboardBounds.size.width;
// Apply new size of table view
self.myTableView.frame = frame;
// Scroll the table view to see the TextField just above the keyboard
if (self.actifText)
{
CGRect textFieldRect = [self.myTableView convertRect:self.actifText.bounds fromView:self.actifText];
[self.myTableView scrollRectToVisible:textFieldRect animated:NO];
}
[UIView commitAnimations];
}
-(void) keyboardWillHide:(NSNotification *)note
{
// Get the keyboard size
CGRect keyboardBounds;
[[note.userInfo valueForKey:UIKeyboardFrameBeginUserInfoKey] getValue: &keyboardBounds];
// Detect orientation
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
CGRect frame = self.myTableView.frame;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.3f];
// Increase size of the Table view
if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
frame.size.height += keyboardBounds.size.height;
else
frame.size.height += keyboardBounds.size.width;
// Apply new size of table view
self.myTableView.frame = frame;
[UIView commitAnimations];
}
@end
Swift 1.2+版本:
class ViewController: UIViewController, UITextFieldDelegate {
@IBOutlet weak var activeText: UITextField!
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
NSNotificationCenter.defaultCenter().addObserver(self,
selector: Selector("keyboardWillShow:"),
name: UIKeyboardWillShowNotification,
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: Selector("keyboardWillHide:"),
name: UIKeyboardWillHideNotification,
object: nil)
}
func textFieldDidBeginEditing(textField: UITextField) {
activeText = textField
}
func textFieldDidEndEditing(textField: UITextField) {
activeText = nil
}
func keyboardWillShow(note: NSNotification) {
if let keyboardSize = (note.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
var frame = tableView.frame
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(0.3)
frame.size.height -= keyboardSize.height
tableView.frame = frame
if activeText != nil {
let rect = tableView.convertRect(activeText.bounds, fromView: activeText)
tableView.scrollRectToVisible(rect, animated: false)
}
UIView.commitAnimations()
}
}
func keyboardWillHide(note: NSNotification) {
if let keyboardSize = (note.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
var frame = tableView.frame
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(0.3)
frame.size.height += keyboardSize.height
tableView.frame = frame
UIView.commitAnimations()
}
}
}
这是我认为最好的答案.很干净.只有两件事:1)你的viewDidLoad没有调用[super viewDidLoad]和2)我必须在frame.size.height行的某些tabbar数学中.否则完美!谢谢.
以下是修改toxaq描述:`MyAppDelegate*appDelegate =(MyAppDelegate*)[[UIApplication sharedApplication] delegate]; CGFloat tabBarHeight = appDelegate.tabBarController.tabBar.frame.size.height;`然后在键盘高度的任何位置从键盘高度减去tabBarHeight.
4> ph.dev..：
我有同样的问题,但注意到它只出现在一个视图中.所以我开始寻找控制器的差异.
我发现滚动行为是在- (void)viewWillAppear:(BOOL)animated超级实例中设置的.
所以一定要这样实现:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
// your code
}
如果你使用UIViewController或者无关紧要UITableViewController; 通过将a UITableView作为self.view的子视图进行检查UIViewController.这是相同的行为.如果呼叫[super viewWillAppear:animated];丢失,视图不允许滚动.
我也有这个问题,这个答案应该让它达到顶峰!
5> squall2022..：
基于BartłomiejSemańczyk解决方案的Swift 3最简单的解决方案:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(CreateEditRitualViewController.keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(CreateEditRitualViewController.keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
// MARK: Keyboard Notifications
@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardHeight = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height {
tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardHeight, 0)
}
}
@objc func keyboardWillHide(notification: NSNotification) {
UIView.animate(withDuration: 0.2, animations: {
// For some reason adding inset in keyboardWillShow is animated by itself but removing is not, that's why we have to use animateWithDuration here
self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0)
})
}
6> mickm..：
我可能错过了这个,因为我没有在这里阅读整篇文章,但我想出的似乎看似简单.我没有通过绞拧器,在所有情况下测试,但它似乎应该工作得很好.
只需通过键盘的高度调整tableview的contentInset,然后将单元格滚动到底部:
- (void)keyboardWasShown:(NSNotification *)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
self.myTableView.contentInset = contentInsets;
self.myTableView.scrollIndicatorInsets = contentInsets;
[self.myTableView scrollToRowAtIndexPath:self.currentField.indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
而且当然
- (void)keyboardWasHidden:(NSNotification *)aNotification
{
[UIView animateWithDuration:.3 animations:^(void)
{
self.myTableView.contentInset = UIEdgeInsetsZero;
self.myTableView.scrollIndicatorInsets = UIEdgeInsetsZero;
}];
}
这太简单了吗？我错过了什么吗？到目前为止它对我来说很好,但正如我所说,我还没有通过绞尽脑汁......
7> Michael Balt..：
我想我已经提出了与Apple应用程序行为相匹配的解决方案.
首先,在你的viewWillAppear中:订阅键盘通知,这样你就知道键盘何时显示和隐藏,系统会告诉你键盘的大小,但不要忘记在你的viewWillDisappear中取消注册:.
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
实现类似于下面的方法,以便在键盘显示后调整tableView的大小以匹配可见区域.这里我分别跟踪键盘的状态,因此我可以选择何时将tableView设置回自己的全高,因为您在每次更改字段时都会收到这些通知.不要忘记实现keyboardWillHide:并选择适合的地方来修复tableView大小.
-(void) keyboardWillShow:(NSNotification *)note
{
CGRect keyboardBounds;
[[note.userInfo valueForKey:UIKeyboardBoundsUserInfoKey] getValue: &keyboardBounds];
keyboardHeight = keyboardBounds.size.height;
if (keyboardIsShowing == NO)
{
keyboardIsShowing = YES;
CGRect frame = self.view.frame;
frame.size.height -= keyboardHeight;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.3f];
self.view.frame = frame;
[UIView commitAnimations];
}
}
现在,这里的滚动位,我们制定出了几个规模第一,然后我们看到我们在可见区域,并设置我们要滚动到RECT要高于或文本字段的基于偏下半视它在视图中的位置.在这种情况下,我们有UITextFields数组和跟踪他们的枚举,所以由行号的rowHeight乘以为我们提供了实际的这种外视图中的帧偏移.
- (void) textFieldDidBeginEditing:(UITextField *)textField
{
CGRect frame = textField.frame;
CGFloat rowHeight = self.tableView.rowHeight;
if (textField == textFields[CELL_FIELD_ONE])
{
frame.origin.y += rowHeight * CELL_FIELD_ONE;
}
else if (textField == textFields[CELL_FIELD_TWO])
{
frame.origin.y += rowHeight * CELL_FIELD_TWO;
}
else if (textField == textFields[CELL_FIELD_THREE])
{
frame.origin.y += rowHeight * CELL_FIELD_THREE;
}
else if (textField == textFields[CELL_FIELD_FOUR])
{
frame.origin.y += rowHeight * CELL_FIELD_FOUR;
}
CGFloat viewHeight = self.tableView.frame.size.height;
CGFloat halfHeight = viewHeight / 2;
CGFloat midpoint = frame.origin.y + (textField.frame.size.height / 2);
if (midpoint < halfHeight)
{
frame.origin.y = 0;
frame.size.height = midpoint;
}
else
{
frame.origin.y = midpoint;
frame.size.height = midpoint;
}
[self.tableView scrollRectToVisible:frame animated:YES];
}
这看起来效果很好.
从iOS 3.2开始,不推荐使用`UIKeyboardBoundsUserInfoKey`.请参阅下面的解决方案,该解决方案适用于所有当前版本≥3.0/@ iPhoneDev
8> Ortwin Gentz..：
如果您可以使用UITableViewController,您将免费获得该功能.但是,有时候这不是一个选项,特别是如果您需要多个视图而不仅仅是UITableView.
这里提出的一些解决方案不适用于iOS≥4,有些不适用于iPad或横向模式,有些不适用于蓝牙键盘(我们不希望任何滚动),有些则不适用在多个文本字段之间切换时工作.因此,如果您选择任何解决方案,请务必测试这些情况.这是我们的解决方案使用 用于在InAppSettingsKit:
- (void)_keyboardWillShow:(NSNotification*)notification {
if (self.navigationController.topViewController == self) {
NSDictionary* userInfo = [notification userInfo];
// we don't use SDK constants here to be universally compatible with all SDKs ? 3.0
NSValue* keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardBoundsUserInfoKey"];
if (!keyboardFrameValue) {
keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardFrameEndUserInfoKey"];
}
// Reduce the tableView height by the part of the keyboard that actually covers the tableView
CGRect windowRect = [[UIApplication sharedApplication] keyWindow].bounds;
if (UIInterfaceOrientationLandscapeLeft == self.interfaceOrientation ||UIInterfaceOrientationLandscapeRight == self.interfaceOrientation ) {
windowRect = IASKCGRectSwap(windowRect);
}
CGRect viewRectAbsolute = [_tableView convertRect:_tableView.bounds toView:[[UIApplication sharedApplication] keyWindow]];
if (UIInterfaceOrientationLandscapeLeft == self.interfaceOrientation ||UIInterfaceOrientationLandscapeRight == self.interfaceOrientation ) {
viewRectAbsolute = IASKCGRectSwap(viewRectAbsolute);
}
CGRect frame = _tableView.frame;
frame.size.height -= [keyboardFrameValue CGRectValue].size.height - CGRectGetMaxY(windowRect) + CGRectGetMaxY(viewRectAbsolute);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
_tableView.frame = frame;
[UIView commitAnimations];
UITableViewCell *textFieldCell = (id)((UITextField *)self.currentFirstResponder).superview.superview;
NSIndexPath *textFieldIndexPath = [_tableView indexPathForCell:textFieldCell];
// iOS 3 sends hide and show notifications right after each other
// when switching between textFields, so cancel -scrollToOldPosition requests
[NSObject cancelPreviousPerformRequestsWithTarget:self];
[_tableView scrollToRowAtIndexPath:textFieldIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}
}
- (void) scrollToOldPosition {
[_tableView scrollToRowAtIndexPath:_topmostRowBeforeKeyboardWasShown atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
- (void)_keyboardWillHide:(NSNotification*)notification {
if (self.navigationController.topViewController == self) {
NSDictionary* userInfo = [notification userInfo];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
_tableView.frame = self.view.bounds;
[UIView commitAnimations];
[self performSelector:@selector(scrollToOldPosition) withObject:nil afterDelay:0.1];
}
}
这是InAppSettingsKit中该类的完整代码.要测试它,请使用"完整列表"子窗格,您可以在其中测试上述方案.
9> Bartłomiej S..：
Swift最简单的解决方案:
override func viewDidLoad() {
super.viewDidLoad()
searchBar?.becomeFirstResponder()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(MyViewController.keyboardWillShow(_:)), name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(MyViewController.keyboardWillHide(_:)), name: UIKeyboardDidHideNotification, object: nil)
}
deinit {
NSNotificationCenter.defaultCenter().removeObserver(self)
}
func keyboardWillShow(notification: NSNotification) {
if let userInfo = notification.userInfo {
if let keyboardHeight = userInfo[UIKeyboardFrameEndUserInfoKey]?.CGRectValue.size.height {
tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardHeight, 0)
}
}
}
func keyboardWillHide(notification: NSNotification) {
UIView.animateWithDuration(0.2, animations: { self.table_create_issue.contentInset = UIEdgeInsetsMake(0, 0, 0, 0) })
// For some reason adding inset in keyboardWillShow is animated by itself but removing is not, that's why we have to use animateWithDuration here
}
10> Hussain KMR ..：
我希望你们已经有了解决所有这些问题的解决方案.但我发现我的解决方案如下.我期待你已经有了一个单元格UITextField.所以在准备时只需将行索引保留在文本字段的标记中.
cell.textField.tag = IndexPath.row;
创建一个具有全局范围的activeTextField实例,UITextField如下所示:
@interface EditViewController (){
UITextField *activeTextField;
}
所以,现在你只需复制粘贴我的代码.而且别忘了添加UITextFieldDelegate
#pragma mark - TextField Delegation
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
activeTextField = textField;
return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField{
activeTextField = nil;
}
注册键盘 notifications
#pragma mark - Keyboard Activity
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
}
处理键盘Notifications:
UIKeyboardDidShowNotification发送时调用.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
[self.tableView setContentInset:contentInsets];
[self.tableView setScrollIndicatorInsets:contentInsets];
NSIndexPath *currentRowIndex = [NSIndexPath indexPathForRow:activeTextField.tag inSection:0];
[self.tableView scrollToRowAtIndexPath:currentRowIndex atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
UIKeyboardWillHideNotification发送时调用
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
[self.tableView setContentInset:contentInsets];
[self.tableView setScrollIndicatorInsets:contentInsets];
}
现在剩下一件事,调用registerForKeyboardNotifications方法in ViewDidLoad方法如下:
- (void)viewDidLoad {
[super viewDidLoad];
// Registering keyboard notification
[self registerForKeyboardNotifications];
// Your codes here...
}
你完成了,希望你的textFields意志不再被键盘隐藏.
11> Colin..：
结合并填充几个答案的空白(特别是Ortwin Gentz,用户98013)和另一篇文章,这将在纵向或横向模式的iPad上开箱即用:
@implementation UIView (FindFirstResponder)
- (UIResponder *)findFirstResponder
{
if (self.isFirstResponder) {
return self;
}
for (UIView *subView in self.subviews) {
UIResponder *firstResponder = [subView findFirstResponder];
if (firstResponder != nil) {
return firstResponder;
}
}
return nil;
}
@end
@implementation MyViewController
- (UIResponder *)currentFirstResponder {
return [self.view findFirstResponder];
}
- (IBAction)editingEnded:sender {
[sender resignFirstResponder];
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return NO;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
UITableViewCell *cell = (UITableViewCell*) [[textField superview] superview];
[_tableView scrollToRowAtIndexPath:[_tableView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
- (void)keyboardWillShow:(NSNotification*)notification {
if ([self currentFirstResponder] != nil) {
NSDictionary* userInfo = [notification userInfo];
// we don't use SDK constants here to be universally compatible with all SDKs ? 3.0
NSValue* keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardBoundsUserInfoKey"];
if (!keyboardFrameValue) {
keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardFrameEndUserInfoKey"];
}
// Reduce the tableView height by the part of the keyboard that actually covers the tableView
CGRect windowRect = [[UIApplication sharedApplication] keyWindow].bounds;
CGRect viewRectAbsolute = [_tableView convertRect:_tableView.bounds toView:[[UIApplication sharedApplication] keyWindow]];
CGRect frame = _tableView.frame;
if (UIInterfaceOrientationLandscapeLeft == self.interfaceOrientation ||UIInterfaceOrientationLandscapeRight == self.interfaceOrientation ) {
windowRect = CGRectMake(windowRect.origin.y, windowRect.origin.x, windowRect.size.height, windowRect.size.width);
viewRectAbsolute = CGRectMake(viewRectAbsolute.origin.y, viewRectAbsolute.origin.x, viewRectAbsolute.size.height, viewRectAbsolute.size.width);
}
frame.size.height -= [keyboardFrameValue CGRectValue].size.height - CGRectGetMaxY(windowRect) + CGRectGetMaxY(viewRectAbsolute);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
_tableView.frame = frame;
[UIView commitAnimations];
UITableViewCell *textFieldCell = (id)((UITextField *)self.currentFirstResponder).superview.superview;
NSIndexPath *textFieldIndexPath = [_tableView indexPathForCell:textFieldCell];
// iOS 3 sends hide and show notifications right after each other
// when switching between textFields, so cancel -scrollToOldPosition requests
[NSObject cancelPreviousPerformRequestsWithTarget:self];
_topmostRowBeforeKeyboardWasShown = [[_tableView indexPathsForVisibleRows] objectAtIndex:0];
[_tableView scrollToRowAtIndexPath:textFieldIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}
}
- (void) scrollToOldPosition {
[_tableView scrollToRowAtIndexPath:_topmostRowBeforeKeyboardWasShown atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
- (void)keyboardWillHide:(NSNotification*)notification {
if ([self currentFirstResponder] != nil) {
NSDictionary* userInfo = [notification userInfo];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
_tableView.frame = self.view.bounds;
[UIView commitAnimations];
[self performSelector:@selector(scrollToOldPosition) withObject:nil afterDelay:0.1];
}
}
@end
12> Corey Floyd..：
如果你使用uitableview来放置文本字段(来自Jeff Lamarche),你可以使用委托方法滚动tableview,就像这样.
(注意:我的文本字段存储在一个数组中,其索引与tableview中的行相同)
- (void) textFieldDidBeginEditing:(UITextField *)textField
{
int index;
for(UITextField *aField in textFields){
if (textField == aField){
index = [textFields indexOfObject:aField]-1;
}
}
if(index >= 0)
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:index inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
[super textFieldDidBeginEditing:textField];
}
13> Dustin Voss..：
键盘通知有效,但Apple的示例代码假定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.
它听起来比听起来容易.这是我在UITableViewController中使用的代码.它有两个实例变量,hiddenRect和keyboardShown.
// 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;
}
14> 小智..：
如果您使用Three20,则使用该autoresizesForKeyboard属性.只需在视图控制器的-initWithNibName:bundle方法中设置即可
self.autoresizesForKeyboard = YES
这需要注意:
收听键盘通知并调整表格视图的框架
滚动到第一个响应者
做完了.
15> 小智..：
我的方法:
我首先将UITextField子类化并添加一个indexPath属性.在cellFor ...方法中,我移交了indexPath属性.
然后我添加以下代码:
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:textField.indexPath];
CGPoint cellPoint = [cell convertPoint:textField.center toView:self.tableView];
[UIView animateWithDuration:0.3 animations:^(void){self.tableView.contentOffset = CGPointMake(0, cellPoint.y-50);}];
到textFieldShould/WillBegin ...等.
当键盘消失时,您必须将其反转:
[UIView animateWithDuration:0.3 animations:^(void){self.tableView.contentOffset = CGPointMake(0, 0);}];
京公网安备 11010802040832号