Question

我认为这是重复使用细胞的一个问题，但我无法解决这个问题，并会欣赏一些额外的眼睛。我有一个uitableviewcell子类比较两个值，如果一个值更高，它将单元格背景更改为红色，否则它将其更改为白色。当我滚动时，一些细胞是白色的，应该是红色，反之亦然。

(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
     tut_MaintListTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"maintCell" forIndexPath:indexPath];


// Configure the cell...

MaintItem *mItem = [self.fetchedResultsController objectAtIndexPath:indexPath];


[cell configureCellForEntry:mItem sendCar:self.carDetail];


return cell;
}

UITableViewCell子类

- (void)configureCellForEntry:(MaintItem *)mItem sendCar:(Car *)carDetails
{
    self.itemLabel.text = [mItem valueForKey:@"item"];
    self.actionLabel.text = [mItem valueForKey:@"action"];
    self.engineLabel.text = [mItem valueForKey:@"engineCode"];
    self.maintIDLabel.text = [[mItem valueForKey:@"maintID" ]stringValue];


// Grab the mileages recorded in the log for this maint item and turn it into a sorted array
NSArray *result = [[mItem.toLog valueForKey:@"mileage"] sortedArrayUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"" ascending:YES]]];

// Determine mileage of next service
NSString *nextServiceMileage = [NSString stringWithFormat:@"%d",  [mItem.intMileage intValue] + [[result lastObject] intValue]];

nextServiceMileageNS = @([nextServiceMileage intValue]);


if ([mItem.frequencyID isEqualToNumber:[NSNumber numberWithInt:3]])
{
           NSString *timing = [[NSString alloc] initWithFormat:@" %@ Once at %@ miles or %@ months", [mItem valueForKeyPath:@"frequencyID"], [mItem valueForKeyPath:@"intMileage"], [mItem valueForKeyPath:@"intMonth"]];
    NSString *howOften = [[NSString alloc] initWithFormat:@" %@", timing];
    self.howOftenLabel.text = howOften;

    if (carDetails.mileage > nextServiceMileageNS)
    {
        self.backgroundColor = [UIColor redColor];
    }
    else
    {
        self.backgroundColor = [UIColor whiteColor];
    }

}

else if ([mItem.frequencyID isEqualToNumber:[NSNumber numberWithInt:4]])

{
    NSString *timing = [[NSString alloc] initWithFormat:@" %@ Every %@ miles or %@ months, due at %@ ", [mItem valueForKeyPath:@"frequencyID"], [mItem valueForKeyPath:@"intMileage"], [mItem valueForKeyPath:@"intMonth"], nextServiceMileage];
    NSString *howOften = [[NSString alloc] initWithFormat:@" %@", timing];
    self.howOftenLabel.text = howOften;

    if (carDetails.mileage > nextServiceMileageNS)
    {
        self.backgroundColor = [UIColor redColor];
    }
    else
    {
        self.backgroundColor = [UIColor whiteColor];
    }

}

else

{
    NSString *howOften = [[NSString alloc] initWithFormat:@" %@", [mItem valueForKeyPath:@"frequencyID"]];
    self.howOftenLabel.text = howOften;
}


}

Answer 1

解决方案是：您还必须在else部分中设置背景颜色。更好的解决方案是，

UIView *backgroundView;

if (condition_1) {

    backgroundView = [UIView new];
    [backgroundView setBackgroundColor:[UIColor whiteColor]];

} else if (condition_2) {

    backgroundView = [UIView new];
    [backgroundView setBackgroundColor:[UIColor redColor]];

} else {

    // here you can set or leave it.
}

[self setBackgroundView:backgroundView];

希望它对你有用......

Answer 2

解决方案是我在if语句中比较两个NSnumber对象。我改变了 if (carDetails.mileage > nextServiceMileageNS)到if ([carDetails.mileage intvalue] > [nextServiceMileageNS intvalue])，现在它正常运行了。应用随机背景的方式似乎是细胞重用问题。

条件格式不适用于UITableView单元格

2 个答案: