indexPathForCell 从 ios7 开始返回 nil [英] indexPathForCell returns nil since ios7

问题描述

我的应用在 ios6.1 下运行良好.尝试了 ios7 模拟器，以下部分不起作用:

my app was running fine under ios6.1. tried the ios7 simulator and the following part does not work:

EditingCell *cell = (EditingCell*) [[textField superview] superview];
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
NSLog(@"the section is %d and row is %d", indexPath.section, indexPath.row);
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *rowKey = [[keysForRows objectAtIndex: section] objectAtIndex: row];

总会来的:

the section is 0 and row is 0

虽然选择了另一个部分/行.有人知道为什么这在 ios7 下不起作用吗?

although another section / row were selected. Has someone an idea why this does not work under ios7?

推荐答案

您查找文本字段的封闭"表格视图单元格的方法很脆弱，因为它假定一个固定的视图层次结构(这似乎在iOS 6 和 iOS 7).

Your approach to find the "enclosing" table view cell of a text field is fragile, because is assumes a fixed view hierarchy (which seems to have changed between iOS 6 and iOS 7).

一种可能的解决方案是在视图层次结构中向上遍历，直到找到表格视图单元格:

One possible solution would be to traverse up in the view hierarchy until the table view cell is found:

UIView *view = textField;
while (view != nil && ![view isKindOfClass:[UITableViewCell class]]) {
    view = [view superview];
}
EditingCell *cell = (EditingCell *)view;

一种完全不同但经常使用的方法是用行标记"文本字段号码:

A completely different, but often used method is to "tag" the text field with the row number:

cell.textField.tag = indexPath.row;   // in cellForRowAtIndexPath

然后只需在文本字段委托方法中使用该标签.

and then just use that tag in the text field delegate methods.

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