Self sizing cell just doesn't work for me - ios

Question

I tried to follow the WWCD 2014 session 226, which introduced the way to realize self sizing cells in iOS 8 using auto layout, and it just doesn't work as it should.
HHTableViewCell.h
#import <UIKit/UIKit.h>
#interface HHTableViewCell : UITableViewCell
#property (strong, nonatomic)UILabel *title;
#end
HHTableViewCell.m
#import "HHTableViewCell.h"
#implementation HHTableViewCell
#synthesize title = _title;
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// configure control(s)
#pragma mark -- title Lable
_title = [[UILabel alloc] initWithFrame:CGRectInset(self.bounds, 15.0, 0.0)];
_title.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
_title.numberOfLines = 0;
[self.contentView addSubview:_title];
#pragma mark -- constraints
NSMutableArray *constraints = [[NSMutableArray alloc]init];
UIView *contentView = self.contentView;
[constraints addObject:[NSLayoutConstraint
constraintWithItem:_title
attribute:NSLayoutAttributeFirstBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.8
constant:3.0]];
[constraints addObject:[NSLayoutConstraint
constraintWithItem:_title
attribute:NSLayoutAttributeFirstBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.8
constant:3.0]];
[constraints addObject:[NSLayoutConstraint
constraintWithItem:_title
attribute:NSLayoutAttributeFirstBaseline
relatedBy:NSLayoutRelationEqual
toItem:contentView
attribute:NSLayoutAttributeTop
multiplier:1.8
constant:3.0]];
[constraints addObject:[NSLayoutConstraint
constraintWithItem:contentView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationGreaterThanOrEqual
toItem:nil
attribute:0
multiplier:1.0
constant:44.0]];
[constraints addObjectsFromArray:[NSLayoutConstraint
constraintsWithVisualFormat:#"H:|-15-[_title]-15-|"
options:0
metrics:nil
views:NSDictionaryOfVariableBindings(_title)]];
[self.contentView addConstraints:constraints];
}
return self;
}
#end
MMTableViewController.h
#import <UIKit/UIKit.h>
#interface MMTableViewController : UITableViewController
#end
MMTableViewController.m
#import "MMTableViewController.h"
#import "HHTableViewCell.h"
#interface MMTableViewController ()
#end
#implementation MMTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView registerClass:[HHTableViewCell class] forCellReuseIdentifier:#"HiCell"];
[self.tableView registerClass:[HHTableViewCell class] forCellReuseIdentifier:#"HCell"];
self.tableView.estimatedRowHeight = 44.0;
self.tableView.rowHeight = UITableViewAutomaticDimension;
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
#warning Potentially incomplete method implementation.
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
#warning Incomplete method implementation.
// Return the number of rows in the section.
return 10;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"HiCell";
HHTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
cell.title.text = #"Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. Hello Apple. ";
// Configure the cell...
NSLog(cell.title.text);
return cell;
}
#end
The cell is of fixed height and wrapping two lines of text. Looks like this:
Hello Apple. Hello Apple. Hello Apple. Hello
Aplle. Hello Apple. Hello Apple. Hello Apple...
Constraints and subviews are added programatically.
Simulator is running iOS 8.3 in Xcode 6.3.1.

Answer 1

For UILabel to work with constraints, looking at Apple's documentation, I think you need to set the preferredMaxLayoutWidth property:
This property affects the size of the label when layout constraints
are applied to it. During layout, if the text extends beyond the width
specified by this property, the additional text is flowed to one or
more new lines, thereby increasing the height of the label.
However, unless you want some specific cell customization, you can use the default UITableViewCell, and set numberOfLines = 0 on the provided titleLabel. It will work with UITableViewAutomaticDimension, although I've only tested it in conjunction with heightForRowAtIndexPath:.
UPDATE:
From what I've learned, you also need to set estimatedRowHeight to something in the viewDidLoad (the value doesn't even needs to be accurate/important it seems).
Here is a working example using default UITableViewCells: