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
我在做一些非常相似的事情它是通用的，不需要为你的代码计算特定的东西。 只需检查代码上的注释:
在MyUIViewController.h
@interface MyUIViewController: UIViewController <UITableViewDelegate, UITableViewDataSource>
{
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
@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()
}
}
}
其他回答
我正在用这些，它们就像魔法一样管用:
bskey控制板- bskey控制板github
tpkeyboardavoidance - tpkeyboardavoidance github
我希望你们读了这些已经找到了答案。但我找到了我的解决方案如下。我期待你已经有一个单元与UITextField。在准备时，保持行索引到文本字段的标签中。
cell.textField.tag = IndexPath.row;
创建一个activeTextField, UITextField实例的全局作用域如下所示:
@interface EditViewController (){
UITextField *activeTextField;
}
现在你只需要在最后复制粘贴我的代码。别忘了添加UITextFieldDelegate
#pragma mark - TextField Delegation
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
activeTextField = textField;
return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField{
activeTextField = nil;
}
注册键盘通知
#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];
}
处理键盘通知:
当发送UIKeyboardDidShowNotification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];
}
当UIKeyboardWillHideNotification被发送时调用
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
[self.tableView setContentInset:contentInsets];
[self.tableView setScrollIndicatorInsets:contentInsets];
}
现在还剩下一件事，在ViewDidLoad方法中调用registerForKeyboardNotifications方法，如下所示:
- (void)viewDidLoad {
[super viewDidLoad];
// Registering keyboard notification
[self registerForKeyboardNotifications];
// Your codes here...
}
你完成了，希望你的文本字段将不再隐藏在键盘。
在viewdidload
-(void)viewdidload{
[super viewdidload];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
-(void)keyboardWillChange:(NSNotification*)sender{
NSLog(@"keyboardwillchange sender %@",sender);
float margin=0 // set your own topmargin
CGFloat originY = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
if (originY >= self.view.frame.size.height){
NSLog(@"keyboardclose");
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, self.view.frame.size.height-margin)];
}else{
NSLog(@"keyobard on");
float adjustedHeight = self.view.frame.size.height - margin - (self.view.frame.size.height-originY);
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, adjustedHeight)];
}
}
我将把我的解决方案(或者QuickDialog的)扔进帽子里。基本上是等待动画到滚动。获得键盘动画JIT而不是神奇的数字会很好。
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
if (textField == self.emailTextField) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 50 * USEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
});
}
}
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;
}
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