Auto layout VFL: align all trailing in an horizontal constraint - ios

Question

I have four labels stacked one below the previous one but alighning its baseline with the top of its content view, not with a vertical spacing with each other.
I do it by code this way
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:topFirstLabel_
attribute:NSLayoutAttributeBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.0f
constant:20.0f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:topSecondLabel_
attribute:NSLayoutAttributeBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.0f
constant:47.0f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:topThirdLabel_
attribute:NSLayoutAttributeBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.0f
constant:70.0f]];
[contentView addConstraint:[NSLayoutConstraint constraintWithItem:topFourthLabel_
attribute:NSLayoutAttributeBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.0f
constant:87.0f]];
Now, I want all labels to be aligned by the trailing space with its superview.
Can I do that with an unique VFL string? Something like this, although this example will crash the app:
NSDictionary *views = NSDictionaryOfVariableBindings(contentView, topFirstLabel_, topSecondLabel_, topThirdLabel_, topFourthLabel_);
NSDictionary *metrics = #{ #"bigMargin" : #12 };
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:[topFirstLabel_][topSecondLabel_][topThirdLabel_][topFourthLabel_]-bigMargin-|"
options:NSLayoutFormatAlignAllTrailing
metrics:metrics
views:views]];

Answer 1

This library might help you. It uses a vertical linear layout concept and you can add paddings as needed.

Answer 2

I don't think you can do this in a single call.
You can probably do something like this:
for ( NSString* viewName in views.allKeys )
{
[contentView addConstraints: [NSLayoutConstraint constraintsWithVisualFormat: [NSString stringWithFormat: #"H:[%#]-bigMargin-|", viewName], options:NSLayoutFormatAlignAllTrailing metrics:metrics views:views];
}