Setting a label to UITableView's tableFooterView - with autolayout - objective-c

Question

When my table view is empty, I want to add a simple label into the tableview footer to display a "no content" message. It was working fine when I was setting the frames of the UILabel and the UIView that I used for footerView, but now I'm trying to convert to using auto-layout, and I can't get it to work.
Here's what I'm doing:
// Create the footer
UIView *tempFooter = [[UIView alloc] init];
UILabel *atext = [[UILabel alloc] init];
tempFooter.translatesAutoresizingMaskIntoConstraints = NO;
atext.translatesAutoresizingMaskIntoConstraints = NO;
atext.numberOfLines = 0;
[atext setText:#"Add Some Text"];
atext.textAlignment = NSTextAlignmentCenter;
atext.font = [UIFont italicSystemFontOfSize:14];
atext.textColor = [UIColor grayColor];
atext.backgroundColor = [UIColor clearColor];
atext.lineBreakMode = NSLineBreakByWordWrapping;
// add label to footer view, and add constraints
[tempFooter addSubview:atext];
NSLayoutConstraint *tvatt1 = [NSLayoutConstraint constraintWithItem:tempFooter
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:atext attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:10.0];
NSLayoutConstraint *tvatt2 = [NSLayoutConstraint constraintWithItem:tempFooter
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:atext
attribute:NSLayoutAttributeRight
multiplier:1.0
constant:10.0];
NSLayoutConstraint *tvatt3 = [NSLayoutConstraint constraintWithItem:tempFooter
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:atext
attribute:NSLayoutAttributeTop
multiplier:5.0
constant:0];
NSLayoutConstraint *tvatt4 = [NSLayoutConstraint constraintWithItem:tempFooter
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:atext
attribute:NSLayoutAttributeBottom
multiplier:1.0
constant: 0];
[tempFooter addConstraints: #[tvatt1, tvatt2, tvatt3, tvatt4]];
// set the footerview
self.tview.tableFooterView = tempFooter;
When I run this, I get a crash:
2014-09-08 19:57:16.594 SimpleList[49442:60b] * Assertion failure in
-[UITableView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2935.137/UIView.m:8794 2014-09-08
19:57:21.073 SimpleList[49442:60b] * Terminating app due to uncaught
exception 'NSInternalInconsistencyException', reason: 'Auto Layout
still required after executing -layoutSubviews. UITableView's
implementation of -layoutSubviews needs to call super
I'm not sure what I'm doing wrong. I've also tried setting constraints for the self.tview.tableFooterView wrt the tempFooter (pinning against all 4 sides) but that doesn't change the crash. I also call:
[self.tview.tableFooterView layoutSubviews];
but that doesn't help either.
Any ideas what I'm doing wrong?

Answer 1

You shouldn't set translatesAutoresizingMaskIntoConstraints to NO for table views, their cells, or table header and footer views (or for your controller's self.view for that matter). It's ok to use constraints for views inside those views (the content view of cells or the header and footer views). I added a simplified version of your code to viewDidLoad, and it worked as expected. Note that you need to give the footer view a height and an x position (the y position and the width are ignored),
UIView *tempFooter = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 50)];
UILabel *atext = [[UILabel alloc] init];
atext.translatesAutoresizingMaskIntoConstraints = NO;
atext.numberOfLines = 0;
[atext setText:#"Add Some Text"];
atext.textAlignment = NSTextAlignmentCenter;
atext.font = [UIFont italicSystemFontOfSize:14];
atext.textColor = [UIColor grayColor];
atext.backgroundColor = [UIColor clearColor];
atext.lineBreakMode = NSLineBreakByWordWrapping;
[tempFooter addSubview:atext];
NSDictionary *dict = NSDictionaryOfVariableBindings(atext);
[tempFooter addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"|-10-[atext]-10-|" options:0 metrics:nil views:dict]];
[tempFooter addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[atext]|" options:0 metrics:nil views:dict]];
self.tableView.tableFooterView = tempFooter;
I'm not sure what you were trying to accomplish with your constraint, tvatt3. The multiplier (you have 5) doesn't do anything with a top or left constraint since the value of those attributes is 0. I used the visual constraints, rather than the method you used, but when I used your code to add the constraints, it worked also .

Answer 2

Interestingly, changing the Autoresizing mask in the xib solved my problem.
Constraints not working:
Working:

Answer 3

I was able to make dynamically auto layout table footer width and height by implementing #rdelmar solution for constraints and adding these lines below. Same solution applies to table header view.
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if let tableFooter = tableView.tableFooterView {
let maxSize = CGSize(width: self.tableView.bounds.size.width,
height: CGFloat.greatestFiniteMagnitude)
let size = tableFooter.systemLayoutSizeFitting(maxSize)
let height = size.height
var headerFrame = tableFooter.frame
// If we don't have this check, viewDidLayoutSubviews() will get
// repeatedly, causing the app to hang.
if height != headerFrame.size.height {
headerFrame.size.height = height
tableFooter.frame = headerFrame
tableView.tableFooterView = tableFooter
}
}
}
P. S. I prefer Interface Builder for constraints setup

Answer 4

hope this will help you
I am not sure of this but it help me in my project, first add every thing in contentView (all the subview and the constraint)
[self.contentView addSubview:atext]
and then comes to code part
NSLayoutConstraint *tvatt1 = [NSLayoutConstraint constraintWithItem:tempFooter
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:atext attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:10.0];
code saying for left attribute
temfooter(must be equal) = 1.0*atext +10.0
i.e
temfooter must be equal to the modified atext , so need to make sure that your constraints are not wrong.