ios - 检索带有边距的 UITableViewCell 的框架

Question

我正在尝试创建一个可编辑的 UITableViewCell，它可以工作，但我缺少边距:

文本直接向左对齐，没有边距。所以我猜 cell.frame 部分有点错误。

但我不知道还能用什么，我尝试了 cell.contentView.frame，但没有任何效果:

UITextField *textField = [[UITextField alloc] initWithFrame:cell.frame];

textField.placeholder     = @"What's your email address?";
textField.clearButtonMode = UITextFieldViewModeNever;
textField.textAlignment   = NSTextAlignmentLeft;

[cell.contentView addSubview: textField];

return cell;

P.S 我稍后可能会添加一个图标，我也不能使用静态边距，它必须以某种方式计算

Answer 1

这应该向您展示如何以快速而肮脏的方式实现这一目标。只需将它放在现有的相同命名方法的位置，看看发生了什么，然后重构它

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"myCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myCell"];

    if (cell == nil) {

        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];

        UITextField *textField = [[UITextField alloc] initWithFrame:CGRectZero];

        textField.placeholder     = @"What's your email address?";
        textField.clearButtonMode = UITextFieldViewModeNever;
        textField.textAlignment   = NSTextAlignmentLeft;
        textField.text = @"hi";

        if ([textField respondsToSelector:@selector(setTranslatesAutoresizingMaskIntoConstraints:)]) {
            [textField setTranslatesAutoresizingMaskIntoConstraints: NO];
        }

        [cell.contentView addSubview: textField];

        NSDictionary * viewsDictionary = NSDictionaryOfVariableBindings(textField);

        [cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[textField]-10-|" options:0 metrics: 0 views:viewsDictionary]];

        [cell addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=1)-[textField(==20)]-(>=1)-|" options:0 metrics: 0 views:viewsDictionary]];

        [cell addConstraint:
         [NSLayoutConstraint constraintWithItem:textField
                                  attribute:NSLayoutAttributeCenterY
                                  relatedBy:NSLayoutRelationEqual
                                     toItem:cell
                                  attribute:NSLayoutAttributeCenterY
                                 multiplier:1
                                   constant:0]];

        textField.backgroundColor = [UIColor grayColor];

    }

    return cell;

}