Question

我想在一个按钮上实现选择/取消选择所有功能，因此必须根据用户交互来选择和取消选择tableview单元格所有按钮。我已经选择了数组和未选择的数组，同时通过tableview单元格按钮进行选择。在给定的代码下方，通过indexPath方法在地窖行上单击tableview单元格按钮。

NSMutableDictionary *d=[_studentArr objectAtIndex:indexPath.row];
cell.studentId.text=[[d objectForKey:@"student_id"]description];
cell.rollNum.text=[[d `enter code here`objectForKey:@"class_roll_no"]description];
cell.firstName.text=[[d objectForKey:@"first_name"]description];
cell.lastName.text=[[d objectForKey:@"last_name"]description];
cell.attendanceStatus.text=[[d objectForKey:@"status"]description];
cell.studentFullName.text=[[[d objectForKey:@"first_name"]description] stringByAppendingString:[[d objectForKey:@"last_name"]description]];
NSLog(@"studentFullName.text=%@ status=%@",cell.studentFullName.text,cell.attendanceStatus.text);

NSLog(@"Student array count=%ld",_studentArr.count);


cell.studentSelectBtn.tag=indexPath.row;
NSLog(@"Selectted cell indexpath===%ld",(long)cell.studentSelectBtn.tag);
[cell.studentSelectBtn setTag:indexPath.row];

[cell.studentSelectBtn addTarget:self action:@selector(studentselectBtnClicked:) forControlEvents:UIControlEventTouchUpInside];

if ([selectedArr containsObject:self.studentArr[indexPath.row]]) {
    [cell.studentSelectBtn setImage:[UIImage imageNamed:@"checkedAttendance.png"] forState:UIControlStateNormal];
    [cell.studentSelectBtn setUserInteractionEnabled:YES];

    NSLog(@"attendance Status in checked ===%@",cell.attendanceStatus.text);
    NSLog(@"selected array count=%ld",selectedArr.count);
}
else{

    [cell.studentSelectBtn setImage:[UIImage imageNamed:@"checkbox.png"] forState:UIControlStateNormal];
    [cell.studentSelectBtn setUserInteractionEnabled:YES];

    NSLog(@"attendance status in unchecked====%@",cell.attendanceStatus.text);
}

Answer 1

您没有显示当前如何向selectedArr添加/删除条目，但是从显示的内容来看，您可以将这两种方法关联为“全选” /“全选”的目标按钮：

-(void) selectAll {
    self.selectedArr = [NSMutableArray arrayWithArray:self.studentArr];
    [self.unselectArr removeAllObjects];
    [self.tableView reloadData];
}

-(void) deselectAll {
    [self.selectedArr removeAllObjects];
    [self.unselectedArr = [NSMutableArray arrayWithArray:self.studentArr];
    [self.tableView reloadData];
}

如何在目标c中的表格视图上方实现一个全选/取消全选按钮？

1 个答案: