如何使用自动布局创建三个视图，其中一个固定宽度的高度和其他两个固定高度的高度

我试图垂直创建一个视图设置，其中UIView顶部有一个（固定宽度，高度），UILabel底部有两个s（固定宽度，动态高度）。视图（aView）周围的填充为5。周围的_mylabel填充为5。left和right的填充_yourLable为5._yourLable将根据文本而增长，但是当文本内容太大时，它将停止增长以维持从Superview的填充的5。

这是我尝试过的：

- (void)viewDidLoad {
    [super viewDidLoad];

    UIView *superview = self.view;

    UIView *aView = [UIView new];
    [aView setBackgroundColor:[UIColor blackColor]];
    [aView setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self.view addSubview:aView];

    _mylabel = [[UILabel alloc]init];
    [_mylabel setNumberOfLines:0];
    [_mylabel setBackgroundColor:[UIColor redColor]];
    [_mylabel setTranslatesAutoresizingMaskIntoConstraints:NO];
    _mylabel.text = @"i am trying to create a view setup vertically where i have one UIView(fix width, height) at top and other two UILables(fix width, dynamic height) at bottom respectively. Padding on allaround of view/lables is 5. this is what i have tried:";
    [self.view addSubview:_mylabel];

    _yourLable = [[UILabel alloc]init];
    [_yourLable setNumberOfLines:0];
    [_yourLable setBackgroundColor:[UIColor redColor]];
    [_yourLable setTranslatesAutoresizingMaskIntoConstraints:NO];
    _yourLable.text = @"i am trying to create a view setup vertically where i have one UIView(fix width, height) at top and other two UILables(fix width, dynamic height) at bottom respectively. Padding on allaround of view/lables is 5. this is what i have tried:";
    [self.view addSubview:_yourLable];

    NSDictionary * views = NSDictionaryOfVariableBindings(aView,_mylabel, _yourLable, superview);

    NSArray * heightConstraintforLabel = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[aView(==200)]-5-[_mylabel]-5-[_yourLable]-5-|" options:0 metrics:nil views:views];
    NSArray * widthConstraintforView = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[aView]-5-|" options:0 metrics:nil views:views];

    NSArray * widthConstraintformylabel = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[_mylabel]-5-|" options:0 metrics:nil views:views];

    NSArray * widthConstraintforyourLable = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[_yourLable]-5-|" options:0 metrics:nil views:views];

    [superview addConstraints:heightConstraintforLabel];
    [superview addConstraints:widthConstraintforView];

    [superview addConstraints:widthConstraintformylabel];

    [superview addConstraints:widthConstraintforyourLable];
}

和

-(void)viewWillLayoutSubviews{
    [super viewWillLayoutSubviews];
    // Your layout logic here

    CGFloat availableLabelWidth = _mylabel.frame.size.width;
    _mylabel.preferredMaxLayoutWidth = availableLabelWidth;

    availableLabelWidth = _yourLable.frame.size.width;
    _yourLable.preferredMaxLayoutWidth = availableLabelWidth;
}

这是我得到的，没有警告：

我希望两个标签都根据确切的文本高度来调整大小。我希望最后一个红色标签按照其中写入的文本增长，但不要超过5的底部空间。也就是说，它应该增长但应保持5的底部填充。

我已经尝试过将垂直内容压缩用于标签的各种组合...，但没有确切的解决方案。

帮助 ：）