Question

我在导航控制器下有一个tableview控制器。我的一些表单元格包含文本字段，因此当我点击它们时，键盘将显示并自动调整（缩小）我的tableview的边界。通过在我的文本字段上调用resignFirstResponder以编程方式解除键盘时，将恢复边界。

我的一些单元格会在点击时将新的视图控制器推入视图堆栈，所以我在推动视图控制器之前首先重新设置当前的文本字段：

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (currentEditingTextField != nil) {
    [currentEditingTextField resignFirstResponder];
    currentEditingTextField = nil;
}
return indexPath;

}

问题是当我导航回我的表视图时，tableview的边界大小就像键盘仍在那里一样。我知道这一点，因为滚动指示器只到达键盘所在的正上方，并且在表视图下面有空的视图空间。

有人经历过这个并知道解决方案吗？感谢

Answer 1

我有同样的问题。我发现在键盘隐藏之前我需要阻止调用[UIView viewWillDisappear:]。

我的解决方案。

// useful method, thus I don't need to remember current first responder
@interface UIView (FindAndResignFirstResponder) 
- (BOOL)findAndResignFirstResonder;
@end

// ---

@implementation UIView (FindAndResignFirstResponder)
// http://stackoverflow.com/questions/1823317/how-do-i-legally-get-the-current-first-responder-on-the-screen-on-an-iphone
- (BOOL)findAndResignFirstResonder {
    if (self.isFirstResponder) {
        return [self resignFirstResponder];
    }
    for (UIView *subView in self.subviews) {
        if ([subView findAndResignFirstResonder]) {
            return YES;
        }
    }
    return NO;
}
@end

// ---

@interface MyTableViewController : UITableViewController {

    // some booleans required to track state of keyboard and view
    BOOL hidingKeyboard;
    BOOL viewWillDisappear;
    BOOL viewWillDisappearAnimated;

}

// methods for keyboard event handling
- (void)keyboardWillHide:(id)sender;
- (void)keyboardDidHide:(id)sender;

@end

// ---

@implementation MyTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // adding observer for keyboard events (notifications)
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
    hidingKeyboard = NO;
    viewWillDisappear = NO;
}

- (void)viewDidUnload {
    [super viewDidUnload];

    // removing observer
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)viewWillDisappear:(BOOL)animated {
    // finding and resigning first responder
    [self.view findAndResignFirstResonder];

    if (hidingKeyboard) {
        // if keyboard hide animation in process,
        //   remembering to run [super viewWillDisappear:] after keyboard hides
        viewWillDisappear = YES;
        viewWillDisappearAnimated = animated;
    } else {
        // if there is no keyboard hide animation,
        //   calling super immediately
        [super viewWillDisappear:animated]; 
    }
}

- (void)keyboardWillHide:(id)sender {
    hidingKeyboard = YES;
}

- (void)keyboardDidHide:(id)sender {
    hidingKeyboard = NO;

    if (viewWillDisappear) {
        // calling [super viewWillAppear:] after keyboard hides, if required
        viewWillDisappear = NO;
        [super viewWillAppear:viewWillDisappearAnimated];
    }
}

@end

tableView在键盘显示时按下另一个视图时调整大小问题

1 个答案: