使用AutoLayout将UIView高度调整为其内容

Question

我正在使用iOS 6 AutoLayout功能与Masonry DSL在UITableViewCell中安排视图.这是我想要实现的布局安排:

这containerView是一个虚拟容器,应该动态调整其大小以适应其内容.通过我当前的实现,这就是我得到的:

似乎containerView确实正确地垂直居中,但它没有宽度和高度,因此没有正确显示.我如何指示containerView其大小适合其内容？代码段附在下面.

谢谢!

UITableViewCell初始化程序

- (id)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier]) {
        self.titleLabel = [[UILabel alloc] init];
        self.titleLabel.font = [UIFont boldSystemFontOfSize:[UIFont smallSystemFontSize]];
        self.titleLabel.text = @"???????";

        self.coverImage = [[UIView alloc] init];
        self.coverImage.backgroundColor = [UIColor carrotColor];

        self.avatarImage = [[UIView alloc] init];
        self.avatarImage.backgroundColor = [UIColor emerlandColor];

        self.authorLabel = [[UILabel alloc] init];
        self.authorLabel.font = [UIFont systemFontOfSize:[UIFont smallSystemFontSize]];
        self.authorLabel.text = @"?????";

        self.containerView = [[UIView alloc] init];
        self.containerView.backgroundColor = [UIColor lightGrayColor];
        [self.containerView addSubview:self.titleLabel];
        [self.containerView addSubview:self.avatarImage];
        [self.containerView addSubview:self.authorLabel];

        [self.contentView addSubview:self.containerView];
        [self.contentView addSubview:self.coverImage];

        self.selectionStyle = UITableViewCellSelectionStyleNone;
        [self updateConstraintsIfNeeded];
    }

    return self;
}

UITableViewCell updateConstraints

- (void)updateConstraints
{
    [super updateConstraints];

    [self.coverImage mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.contentView).with.offset(20);
        make.top.equalTo(self.contentView).with.offset(5);
        make.bottom.equalTo(self.contentView).with.offset(-5);

        make.width.equalTo(self.coverImage.mas_height).multipliedBy(0.75);
    }];

    [self.containerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.coverImage.mas_right).with.offset(10);
        make.centerY.equalTo(self.contentView);
    }];

    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.containerView);
        make.top.equalTo(self.containerView);
    }];

    [self.avatarImage mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.titleLabel.mas_bottom).with.offset(5);
        make.left.equalTo(self.titleLabel);

        make.width.equalTo(@20);
        make.height.equalTo(@20);
    }];

    [self.authorLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.avatarImage.mas_right).with.offset(5);
        make.centerY.equalTo(self.avatarImage);
    }];
}

Answer 1

我找到了解决自己问题的方法.显然,为了containerView动态地调整自身大小,我们必须确保内部的每个元素彼此刚性连接以及超视图的边缘(即containerView).例如,在VFL中它应该是这样的:"V:|-10-[child1]-5-[child2]-5-|"

所以,在我的情况,我添加了一个新的约束make.bottom.equalTo(self.containerView),以avatarImage现在的上海华知道如何高度本身!