example for http://stackoverflow.com/a/26261978/1271826

gistfile1.m

// example for http://stackoverflow.com/a/26261978/1271826

// create scroll view

UIScrollView *scrollView = [[UIScrollView alloc] init];
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[scrollViewSuperView addSubview:scrollView];

// create container 1

UIView *container1 = [[UIView alloc] init];
container1.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:container1];

// create labels for container 1

UILabel *label1_1 = [[UILabel alloc] init];
label1_1.text = @"Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.";
label1_1.numberOfLines = 0;
label1_1.translatesAutoresizingMaskIntoConstraints = NO;
[container1 addSubview:label1_1];

UILabel *label1_2 = [[UILabel alloc] init];
label1_2.text = @"Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battlefield of that war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. It is altogether fitting and proper that we should do this.";
label1_2.numberOfLines = 0;
label1_2.translatesAutoresizingMaskIntoConstraints = NO;
[container1 addSubview:label1_2];

UILabel *label1_3 = [[UILabel alloc] init];
label1_3.text = @"But, in a larger sense, we can not dedicate, we can not consecrate, we can not hallow this ground. The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. The world will little note, nor long remember what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us—that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain—that this nation, under God, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.";
label1_3.numberOfLines = 0;
label1_3.translatesAutoresizingMaskIntoConstraints = NO;
[container1 addSubview:label1_3];

// create container 2

UIView *container2 = [[UIView alloc] init];
container2.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:container2];

// create labels for container 2

UILabel *label2_1 = [[UILabel alloc] init];
label2_1.text = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin varius aliquet leo, nec malesuada est pulvinar nec. Aliquam sodales tristique ante, ac ornare ante maximus commodo. Nunc consectetur urna in enim vehicula, malesuada laoreet diam pretium. Donec sed lorem eu massa consectetur convallis quis ac nibh. Fusce quis tellus sit amet ligula mollis iaculis a eu sem. Sed tincidunt arcu est, eget pretium tellus ullamcorper eu. Morbi aliquet convallis fermentum. Sed a finibus ipsum. Vestibulum ultrices luctus nibh nec finibus. Proin vehicula ex ut felis ullamcorper, ac lobortis neque elementum.\n\nPraesent tincidunt luctus dui in vulputate. Maecenas dictum sapien congue quam iaculis efficitur. Phasellus in enim eleifend, tempor nunc et, bibendum tortor. Vivamus fermentum tempor placerat. Phasellus mattis, quam id pretium faucibus, elit velit accumsan arcu, a faucibus elit elit non purus. Donec lorem purus, condimentum ut dui vitae, dignissim molestie orci. Sed vel erat cursus, luctus lacus id, eleifend felis. Vivamus sed consequat lectus. Maecenas congue ultrices nunc varius dapibus. Nulla facilisi. Vestibulum efficitur arcu enim, eget ornare ex fermentum ac. Proin pulvinar, libero vitae cursus semper, odio risus rutrum metus, nec dapibus lorem lacus eget ex. Pellentesque lobortis, lectus in tincidunt vestibulum, tortor metus semper enim, ut volutpat enim mi a nulla. Fusce semper accumsan augue, ac faucibus est aliquet nec. Cras vitae tempor dui.";
label2_1.numberOfLines = 0;
label2_1.translatesAutoresizingMaskIntoConstraints = NO;
[container2 addSubview:label2_1];

UILabel *label2_2 = [[UILabel alloc] init];
label2_2.text = @"Phasellus molestie sapien ante, in viverra turpis cursus at. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Phasellus mollis arcu id magna accumsan dictum. Fusce quis dapibus nisi, id maximus quam. Nulla vel lacus justo. In vitae felis at risus commodo scelerisque. Cras molestie a tellus et laoreet. Ut nec dolor eget arcu fringilla cursus non vel leo. Pellentesque blandit semper augue sed fringilla. Ut iaculis mi quis nunc sagittis dignissim. Vivamus lacus sapien, mollis sit amet scelerisque sit amet, gravida sed tortor.\n\nMorbi id ultricies tellus. Quisque aliquet laoreet turpis. Ut a sem molestie, vestibulum tellus sed, ullamcorper orci. Duis purus neque, porttitor vitae nulla vel, pulvinar consectetur diam. Suspendisse ac molestie elit. Vivamus consectetur rhoncus nisl vel iaculis. Suspendisse nec venenatis purus, sit amet vestibulum arcu. Praesent tempor nisl vel urna sagittis pharetra. Integer dignissim, tellus nec facilisis ullamcorper, lectus tellus euismod neque, elementum dapibus turpis ipsum ac tellus. Proin at massa et ex cursus accumsan.\n\nUt tortor urna, dapibus at semper quis, consequat vel mi. Quisque pharetra sapien nec velit rutrum vestibulum. Maecenas non lorem ex. Aenean interdum varius porta. Suspendisse viverra maximus neque, vitae porta purus. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum nulla risus, commodo et tellus ut, ornare tincidunt nunc. Integer id mi nibh. Sed eu justo luctus, imperdiet erat aliquet, ultrices sapien.";
label2_2.numberOfLines = 0;
label2_2.translatesAutoresizingMaskIntoConstraints = NO;
[container2 addSubview:label2_2];

NSDictionary *views = NSDictionaryOfVariableBindings(scrollView, container1, label1_1, label1_2, label1_3, container2, label2_1, label2_2);

// set up scroll view to take up entire superview

[scrollViewSuperView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|" options:0 metrics:nil views:views]];
[scrollViewSuperView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|" options:0 metrics:nil views:views]];

// set up containers to take up entire scrollview

[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[container1]|" options:0 metrics:nil views:views]];
[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[container2]|" options:0 metrics:nil views:views]];
[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[container1][container2]|" options:0 metrics:nil views:views]];

// layout labels within container 1

[container1 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[label1_1]-8-|" options:0 metrics:nil views:views]];
[container1 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[label1_2]-8-|" options:0 metrics:nil views:views]];
[container1 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[label1_3]-8-|" options:0 metrics:nil views:views]];
[container1 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[label1_1]-[label1_2]-[label1_3]-|" options:0 metrics:nil views:views]];

// layout labels within container 2

[container2 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[label2_1]-8-|" options:0 metrics:nil views:views]];
[container2 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[label2_2]-8-|" options:0 metrics:nil views:views]];
[container2 addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[label2_1]-[label2_2]-|" options:0 metrics:nil views:views]];

// tell the labels to be as wide as the superview of the scroll view (minus a bit for margins)

NSArray *labels = @[label1_1, label1_2, label1_3, label2_1, label2_2];
for (UILabel *label in labels) {
    [scrollViewSuperView addConstraint:[NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:scrollViewSuperView attribute:NSLayoutAttributeWidth multiplier:1.0 constant:-16.0]];
}