我在 UITableView 中创建一个表单，当我使用 for (UIView *view in cell.contentView.subviews){} 收集表格中的所有数据时，即使它遍历了 UITableView 中的每个单元格，它看不到行中尚不可见的任何数据。我如何访问这些数据？
我尝试添加 scrollToRowAtIndexPath 以徒劳地希望它能加载可见行但无济于事。
for (int i=0; i < countArray.count; i++) { //count needs to be for the cells entire tableView
NSIndexPath *indexPath = [NSIndexPath indexPathForRow: i inSection: 0]; //create NSIndexPath for each cell in section 0
UITableViewCell *cell = [self.table cellForRowAtIndexPath:indexPath]; //iterating through each cell available in table
NSLog(@"iterationing through cell \"%i\"",indexPath.row);
[self.table scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
NSLog(@"moving view to \"%i\"",indexPath.row);
for (UIView *view in cell.contentView.subviews){ //find views within cell.contentview
if ([view isKindOfClass:[UITextField class]]){ // narrow those views down to anything with class UITextField
UITextField* txtField = (UITextField *)view; // instantiate the UITextField
if (txtField.tag == 201) { //find the tag of the instantiated UITextField
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
}else if (dataSwitch == 1) { //we are distributing data
txtField.text = [tmpArray objectAtIndex:i];
}
}
else if (txtField.tag == 202) { //find the tag of the instantiated UITextField
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
}else if (dataSwitch == 1) { //we are distributing data
txtField.text = [tmpArray objectAtIndex:i];
}
}
else if (txtField.tag == 203) { //find the tag of the instantiated UITextField
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
}else if (dataSwitch == 1) { //we are distributing data
txtField.text = [tmpArray objectAtIndex:i];
}
}
else if (txtField.tag == 204) { //find the tag of the instantiated UITextField
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
}else if (dataSwitch == 1) { //we are distributing data
txtField.text = [tmpArray objectAtIndex:i];
}
}
else if (txtField.tag == 205) { //find the tag of the instantiated UITextField
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
}else if (dataSwitch == 1) { //we are distributing data
txtField.text = [tmpArray objectAtIndex:i];
}
}
else {
NSLog(@"Data is being lost %@ with tag %i",[tmpArray objectAtIndex:i], txtField.tag);
}
}
// End of isKindofClass
if ([view isKindOfClass:[UIImageView class]]){ // narrow those views down to anything with class UIImage
UIImageView* image = (UIImageView *)view; // instantiate the UIImage
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:image];
NSLog(@"collecting image data and storing in %i",i);
}else if (dataSwitch == 1) { //we are distributing data
image = [tmpArray objectAtIndex:i];
}
}
if ([view isKindOfClass:[UILabel class]]){ // narrow those views down to anything with class UILabel
UILabel* label = (UILabel *)view; // instantiate the UILabel
if (label.tag == 301) { //find the tag of the instantiated UILabel
if (dataSwitch == 0) { //we are collecting data
[tmpLabelArray addObject:[NSString stringWithFormat:@"%@",label.text]];
NSLog(@"%@",[NSString stringWithFormat:@"%@",label.text]);
}
}
}
if ([view isKindOfClass:[UISegmentedControl class]]){ // narrow those views down to anything with class UISegmentedControl
UISegmentedControl* seg = (UISegmentedControl *)view; // instantiate the UISegmentedControl
if (dataSwitch == 0) { //we are collecting data
[tmpArray addObject:[NSString stringWithFormat:@"%i",seg.selectedSegmentIndex]];
}
}
} // End of Cell Sub View
}// Counter Loop
如有任何帮助，我们将不胜感激。
谢谢尼克。
**编辑**
这是我最后做的
Duncan C 是对的，像这样获取信息是不正确的。可以为 tableview 设置动画以将可重用的单元格带入 View 并收集数据，但它看起来很乱，这是一种更简洁的方法。
-(void)textFieldDidEndEditing:(UITextField *)textField {
if(textField.tag >= 0 && textField.tag <= 10) {
CGPoint location = [self.table convertPoint:textField.frame.origin fromView:textField.superview];
NSIndexPath *indexPath = [self.table indexPathForRowAtPoint:location]; //get the indexPath of the textField.
NSString *str1 = [NSString stringWithFormat:@"%i",stack];
NSString *str2 = [NSString stringWithFormat:@"%i",indexPath.row];
NSString *str3 = [NSString stringWithFormat:@"%@",textField.text];
NSMutableArray *cellAnswer = [[NSMutableArray alloc] initWithObjects:str1,str2,str3, nil];
}
}
最佳答案
您对 TableView 的工作方式以及应该如何使用它们存在概念上的误解。不可见的单元格不存在。 TableView 只创建那些当前可见的单元格。当用户滚动时，滚出屏幕的单元格被放入回收队列，然后重新用作新出现的单元格的新单元格。
单元格是 View 对象，不应该用来保存数据。当用户在单元格中输入数据(在文本字段中键入文本、更改开关或 slider 的值等)时，您应该立即收集这些更改并将它们保存到 TableView 显示的模型中。然后，如果一个单元格滚动到屏幕外并被丢弃，那么您已经收集了它的状态数据。
关于ios - 当单元格不可见时，如何访问和迭代 UITableView 中的 contentView.subviews？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22324789/