当按下新视图控制器并且键盘隐藏时,TableView框架没有正确调整大小

时间:2010-06-09 23:50:50

标签: iphone objective-c uitableview uiviewcontroller

我必须遗漏一些基本的东西。我在NavigationViewController中有一个UITableView。当在UITableView中选择一个表行时(使用tableView:didSelectRowAtIndexPath :)我调用pushViewController来显示一个不同的视图控制器。新的视图控制器正确显示,但当我弹出该视图控制器并返回时,UITableView的大小调整大小,就好像键盘正在显示一样。在推动视图控制器之前,我需要找到一种让键盘隐藏的方法,以便正确恢复帧。如果我注释掉代码以推动视图控制器,则键盘会正确隐藏,并且框架会正确调整大小。

我用来显示键盘的代码如下:

- (void) keyboardDidShowNotification:(NSNotification *)inNotification {
    NSLog(@"Keyboard Show");
    if (keyboardVisible) return;
    // We now resize the view accordingly to accomodate the keyboard being visible
    keyboardVisible = YES;

    CGRect bounds = [[[inNotification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    bounds = [self.view convertRect:bounds fromView:nil];   

    CGRect tableFrame = tableViewNewEntry.frame;
    tableFrame.size.height -= bounds.size.height; // subtract the keyboard height
    if (self.tabBarController != nil) {
        tableFrame.size.height += 48; // add the tab bar height
    }

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(shrinkDidEnd:finished:contextInfo:)];
    tableViewNewEntry.frame = tableFrame;
    [UIView commitAnimations];
}

使用以下方法隐藏键盘:

- (void) keyboardWillHideNotification:(NSNotification *)inNotification {
    if (!keyboardVisible) return;
    NSLog(@"Keyboard Hide");
    keyboardVisible = FALSE;

    CGRect bounds = [[[inNotification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    bounds = [self.view convertRect:bounds fromView:nil];

    CGRect tableFrame = tableViewNewEntry.frame;
    tableFrame.size.height += bounds.size.height; // add the keyboard height
    if (self.tabBarController != nil) {
        tableFrame.size.height -= 48; // subtract the tab bar height
    }
    tableViewNewEntry.frame = tableFrame;   

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(_shrinkDidEnd:finished:contextInfo:)];
    tableViewNewEntry.frame = tableFrame;    
    [UIView commitAnimations];

    [tableViewNewEntry scrollToNearestSelectedRowAtScrollPosition:UITableViewScrollPositionMiddle animated:YES];
    NSLog(@"Keyboard Hide Finished");
}

我通过让第一个响应者为ViewWillDisappear中的第一个响应者控制来触发键盘被隐藏。我添加了NSLog语句并查看日志文件中发生的事情,如下所示:

显示键盘
ViewWillDisappear:隐藏键盘
隐藏键盘
键盘隐藏完成
PushViewController(我推动新视图控制器时的NSLog条目)

从这个跟踪中,我可以看到正确顺序发生的事情,但似乎在按下视图控制器时键盘隐藏代码无法正常执行。

任何想法都会非常感激。我一直在敲击键盘一段时间试图找出我做错了什么。

- 添加了didSelectRowAtIndexPath

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    switch (indexPath.section) {
        case 0: // Required Info
                // removed to simplify
        case 1: // Optional Info
            switch (indexPath.row) {
                case 0:
                    [self showTextDetailPicker: @"Enter a description" 
                                           tag: tDescriptionPicker
                                  sourceTarget: self.newRecord
                                   fieldSource: @selector(description)]; 

                    break;
                default:
                    break;
            }
            break;
        default:
            break;
    }

}



- (void) showTextDetailPicker: (NSString*) titleText tag:(int)tagID sourceTarget:(NSObject*)target fieldSource:(SEL)selector{

    FieldEditorViewController *fe = [[FieldEditorViewController alloc] init];
    fe.titleText = titleText; 
    fe.fieldText = [target performSelector: selector];
    fe.tag = tagID;

    // Replace default back button with one that just says 'Back'
    UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] 
                                      initWithTitle:@"Back" 
                                      style:UIButtonTypeInfoLight
                                      target:nil action:nil];
    [[self navigationItem] setBackBarButtonItem: newBackButton];
    [newBackButton release];

    [fe setDelegate: self];
    [self.navigationController pushViewController:fe animated:YES];
    [fe release];   
}

1 个答案:

答案 0 :(得分:2)

在推动视图控制器之前,找到第一个响应者并呼叫辞职。使用category from this SO post查看如何递归找到第一个响应者(不确定你是否已经这样做了)。

- (void)tableView:(UITableView *)tableView 
          didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIView *fp = [[self view] findFirstResponder];

    [fp resignFirstResponder];

    // Push new view controller here.
    NextViewController *controller = [[NextViewController alloc] init];
    [[self navigationController] pushViewController:controller animated:YES];
    [controller release], controller = nil;
}

要记住的另一件事是您的表视图会自动调整大小,因为您的根视图控制器是从UITableViewController派生的(或者看起来似乎如此)。如果你使根视图控制器成为一个常规的UIViewController 包含一个UITableView,你可以更容易地手动操作表视图的框架 - 至少这是我的经验。