代码之家 › 专栏 › 技术社区 › Onur Var

indexPathForCell无法识别的选择器已通过ObjC发送到iOS 8上的实例

nsindexpath unrecognized-selector ios8 uitableview

Onur Var · 技术社区 · 10 年前

我在UITableViewCell中有一个UITextField。当用户试图在此文本字段中输入一些文本时,应用程序会将该单元格滚动到UITableView的顶部。代码如下:

#pragma mark - UITextField Delegates
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    UITableViewCell *QCELL = (UITableViewCell *)[[[[textField superview]superview]superview]superview];
    UITableView *QTable = (UITableView *)[[QCELL superview] superview];
    NSIndexPath*path = = [QTable indexPathForCell:QCELL];
    return true;
}

和异常

    2014-09-11 11:12:50.604 InspectTHIS[9401:348011] -[UIView indexPathForCell:]: unrecognized selector sent to instance 0x7c2e8b30
    2014-09-11 11:12:50.608 InspectTHIS[9401:348011] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView indexPathForCell:]: unrecognized selector sent to instance 0x7c2e8b30'

已更新-已答复

我在视图图层中搜索后发现

//////////iOS 8//////////

<UIView: 0x792aabd0; frame = (0 0; 768 1023); opaque = NO; autoresize = W+H; layer = <CALayer: 0x792aac40>>
<UITableViewCellContentView: 0x79758340; frame = (0 0; 768 699); opaque = NO; gestureRecognizers =                 <NSArray: 0x79758530>; layer = <CALayer: 0x797583b0>>
<QuestionCell: 0x79757ed0; baseClass = UITableViewCell; frame = (0 0; 768 699); autoresize = W; layer = <CALayer: 0x79758190>>
<UITableViewWrapperView: 0x7967bc50; frame = (0 0; 768 750); gestureRecognizers = <NSArray: 0x7967bef0>; layer = <CALayer: 0x7967be30>; contentOffset: {0, 0}; contentSize: {768, 750}>
<UITableView: 0x78c99600; frame = (0 244; 768 750); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7967b9c0>; layer = <CALayer: 0x7967ae00>; contentOffset: {0, 0}; contentSize: {768, 699}>
<UIView: 0x7967abd0; frame = (0 0; 768 1024); autoresize = RM+BM; layer = <CALayer: 0x7967ac40>>

////////iOS 7////

<UIView: 0x11fbbbf0; frame = (0 0; 768 1023); opaque = NO; autoresize = W+H; layer = <CALayer: 0x11fbbc50>>
<UITableViewCellContentView: 0x11f832a0; frame = (0 0; 768 699); opaque = NO; gestureRecognizers =     <NSArray: 0x11f8dd40>; layer = <CALayer: 0x11faa6f0>>
<UITableViewCellScrollView: 0x11fc4090; frame = (0 0; 768 699); autoresize = W+H; gestureRecognizers = <NSArray: 0x11f9c830>; layer = <CALayer: 0x11f978f0>; contentOffset: {0, 0}>
<QuestionCell: 0x11fa2090; baseClass = UITableViewCell; frame = (0 0; 768 699); autoresize = W; layer = <CALayer: 0x11fa1c90>>
<UITableViewWrapperView: 0xced1860; frame = (0 0; 768 750); autoresize = W+H; layer = <CALayer: 0xced18d0>>
<UITableView: 0xd958800; frame = (0 244; 768 750); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0xced1560>; layer = <CALayer: 0xced0eb0>; contentOffset: {0, 0}>
<UIView: 0xced0c30; frame = (0 0; 768 1024); autoresize = RM+BM; layer = <CALayer: 0xced0c90>>

正如你在iOS 8中看到的,UITableViewCellScrollView缺失,我无法像在iOS 7中那样升级。所以我这样修改代码。

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    NSIndexPath*path;
    UITableView *QTable;
    CGFloat version =[[[UIDevice currentDevice] systemVersion] floatValue];
    if (version >= 7.0)
    {
        UITableViewCell *QCELL = (UITableViewCell *)[[[[textField superview]superview]superview]superview];
        QTable = (UITableView *)[[QCELL superview] superview];
        path  = [QTable indexPathForCell:QCELL];
    }
    else if(version >= 8.0)
    {
        UITableViewCell *QCELL = (UITableViewCell *)[[[textField superview]superview]superview];
        QTable = (UITableView *)[[QCELL superview] superview];
        path  = [QTable indexPathForCell:QCELL];
    }

    NSIndexPath*path = = [QTable indexPathForCell:QCELL];
    return true;
}

3 回复 | 直到 10 年前

Juan 10 年前

我对你的原始代码做了一点修改,结果是:

我做了此更改,因为当版本为8时,我遇到了问题,如果>=7人被解雇。我需要if之外的变量。

 CGFloat version =[[[UIDevice currentDevice] systemVersion] floatValue];
UITableViewCell *cell;
UITableView *table;

if ((version > 7) && (version < 8))
{
    UITableViewCell *cell = (UITableViewCell*)[[[sender superview] superview]superview];
    table = (UITableView *)cell.superview.superview;


}
else if(version > 8)
{
    UITableViewCell *cell = (UITableViewCell*)[[sender superview] superview];
    table = (UITableView *)cell.superview.superview;

 }

deltaaruna 10 年前

类似地,我在UITableViewCell中有一个按钮。这将对您有用。此处buttonView表示我的UIButton实例对于iOS 8

UITableViewCell *cell = (UITableViewCell*)[buttonView superview];

给了我UITableViewCell实例和iOS 7一样

UITableViewCell *cell = [buttonView superview]superview];

给了我UITableViewCell实例

以及

[QTable indexPathForCell:cell];

将为您提供NSIndexPath(该部分在给定的答案中是正确的)。

ullstrm 10 年前

这是遍历视图层次结构而不是使用单元格本身的委托方法所获得的结果。

使单元格本身响应文本视图的委托。让单元格拥有自己的协议(委托方法),让TableViewController成为它的委托。

然后,子类UITableViewCell类中的代码将如下所示:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField 
{

    [self.delegate textFieldDidBeginEditingForCell:self];
    return true;
}

然后在TableViewController中:

- (void)textFieldDidBeginEditingForCell:(YourCustomCell*)cell 
{
    NSIndexPath *path =  [QTable indexPathForCell:cell];

   ...
}