UITableView within UIScrollView using autolayout

Solution 1:

First of all, are those other views (siblings of the table view) strictly above and below the table view? If so, have you considered letting the table view scroll normally, and putting those outside views in the table view's header and footer views? Then you don't need the scroll view.

Second, you may want to read Technical Note TN2154: UIScrollView And Autolayout if you haven't already.

Third, given the information in that tech note, I can think of a few ways to do what you want. The cleanest is probably to create a subclass of UITableView that implements the intrinsicContentSize method. The implementation is trivial:

@implementation MyTableView

- (CGSize)intrinsicContentSize {
    [self layoutIfNeeded]; // force my contentSize to be updated immediately
    return CGSizeMake(UIViewNoIntrinsicMetric, self.contentSize.height);
}

@end

Then just let auto layout use the table view's intrinsic content size. Create the constraints between the subviews of the scroll view (including the table view) to lay them out, and make sure there are constraints to all four edges of the scroll view.

You probably need to send invalidateIntrinsicContentSize to the table view at appropriate times (when you add or remove rows or change the heights of rows). You could probably just override the appropriate methods in MyTableView to do that. E.g. do [self invalidateIntrinsicContentSize] in -endUpdates, -reloadData, - insertRowsAtIndexPaths:withRowAnimation:, etc.

Here's the result of my testing:

The scroll view has the light blue background. The red top label and the blue bottom label are siblings of the table view inside the scroll view.

Here's the complete source code for the view controller in my test. There's no xib file.

#import "ViewController.h"
#import "MyTableView.h"

@interface ViewController () <UITableViewDataSource, UITableViewDelegate>

@end

@implementation ViewController

- (void)loadView {
    UIView *view = [[UIView alloc] init];
    self.view = view;

    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    scrollView.backgroundColor = [UIColor cyanColor];
    [view addSubview:scrollView];

    UILabel *topLabel = [[UILabel alloc] init];
    topLabel.translatesAutoresizingMaskIntoConstraints = NO;
    topLabel.text = @"Top Label";
    topLabel.backgroundColor = [UIColor redColor];
    [scrollView addSubview:topLabel];

    UILabel *bottomLabel = [[UILabel alloc] init];
    bottomLabel.translatesAutoresizingMaskIntoConstraints = NO;
    bottomLabel.text = @"Bottom Label";
    bottomLabel.backgroundColor = [UIColor blueColor];
    [scrollView addSubview:bottomLabel];

    UITableView *tableView = [[MyTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
    tableView.translatesAutoresizingMaskIntoConstraints = NO;
    tableView.dataSource = self;
    tableView.delegate = self;
    [scrollView addSubview:tableView];

    UILabel *footer = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 30)];
    footer.backgroundColor = [UIColor greenColor];
    footer.text = @"Footer";
    tableView.tableFooterView = footer;

    NSDictionary *views = NSDictionaryOfVariableBindings(
        scrollView, topLabel, bottomLabel, tableView);
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"V:|[scrollView]|"
        options:0 metrics:nil views:views]];
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"H:|[scrollView]|"
        options:0 metrics:nil views:views]];
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"V:|[topLabel][tableView][bottomLabel]|"
        options:0 metrics:nil views:views]];
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"H:|[topLabel]|"
        options:0 metrics:nil views:views]];
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"H:|-8-[tableView]-8-|"
        options:0 metrics:nil views:views]];
    [view addConstraint:[NSLayoutConstraint
        constraintWithItem:tableView attribute:NSLayoutAttributeWidth
        relatedBy:NSLayoutRelationEqual
        toItem:view attribute:NSLayoutAttributeWidth
        multiplier:1 constant:-16]];
    [view addConstraints:[NSLayoutConstraint
        constraintsWithVisualFormat:@"H:|[bottomLabel]|"
        options:0 metrics:nil views:views]];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 20;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
    }
    cell.textLabel.text = [NSString stringWithFormat:@"Row %d", indexPath.row];
    return cell;
}

@end

Solution 2:

In addition to rob's answer there is swift example of self-resizable subclass of UITableView:

Swift 2.x

class IntrinsicTableView: UITableView {

    override var contentSize:CGSize {
        didSet {
            self.invalidateIntrinsicContentSize()
        }
    }


    override func intrinsicContentSize() -> CGSize {
        self.layoutIfNeeded()
        return CGSizeMake(UIViewNoIntrinsicMetric, contentSize.height)
    }

}

Swift 3.x or Swift 4.x

class IntrinsicTableView: UITableView {

    override var contentSize:CGSize {
        didSet {
            self.invalidateIntrinsicContentSize()
        }
    }

    override var intrinsicContentSize: CGSize {
        self.layoutIfNeeded()
        return CGSize(width: UIViewNoIntrinsicMetric, height: contentSize.height)
    }

}

I have used it to put a table view into another auto-resizable table view's cell.