I want to build such interface:
With auto layout disabled, I successfully created those 6 buttons and well adjusted them through code in function of screen's height. However, when disabling auto layout, all other controllers become "messy" so I tried to create/adjust those buttons with auto layout enabled. And there is NO WAY to achieve such interface with auto layout enabled. My question is, is there any trick, solution to adjust those 6 buttons with auto layout enabled? Or perhaps there is a library? I'm really stacked.
Thank you for your help.
I see you found an answer, but I'll post mine anyway, because it uses a different approach. Trying to get the constraints correct in IB (in iOS 6) when there are so many dependencies among the 6 buttons is difficult (because of the constraints the system adds for you in IB), so I did it in code. I did it in such a way that the buttons take the whole screen in any size screen or any orientation without having to check the screen size:
#interface ViewController ()
#property (strong,nonatomic) NSMutableDictionary *viewsDict;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.viewsDict = [NSMutableDictionary dictionary];
for (int i=1; i<7; i++) {
UIButton *b = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[b setTitle:[NSString stringWithFormat:#"Button%d",i] forState:UIControlStateNormal];
[b setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.viewsDict setObject:b forKey:[NSString stringWithFormat:#"b%d",i]];
[self.view addSubview:b];
}
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"|[b1][b2(==b1)]|" options:0 metrics:nil views:self.viewsDict]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"|[b3][b4(==b3)]|" options:0 metrics:nil views:self.viewsDict]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"|[b5][b6(==b5)]|" options:0 metrics:nil views:self.viewsDict]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[b1][b3(==b1)][b5(==b1)]|" options:0 metrics:nil views:self.viewsDict]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[b2][b4(==b2)][b6(==b2)]|" options:0 metrics:nil views:self.viewsDict]];
}
With autolayout, you will definitely want to wrap those six views in another UIView to prevent layout interactions between the buttons and other views. If that UIView has a fixed height and width, it might be as simple as that.
Related
I have been searching for the whole day, but could not make it work.
I have a UIView with two labels, on above the other, on the left side, and one button on the right side. I added the constraints to let autolayout resize views accordingly. Everything was working perfectly when I had set one constraint for the height of the UIView (and no one constraint for the height of the two UILabel), but as the content of the lower UILabel will vary, I removed that constraint and set two constraints for the UILabel, one fixed for the upper UILabel and one with relation "greater than or equal" for the lower UILabel, and other one to fix the distance between the lower UILabel and the UIView.
It looks like auto layout is not capable of calculate the intrinsicContentSize of the lower UILabel, because it never increases its height above 10px, despite the content of the lower UILabel.
UIView *miView = [[UIView alloc] init];
UILabel *miLabel = [[UILabel alloc] init];
[miLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[miDetailsLabel setNumberOfLines:1];
[miDetailsLabel setText:#"Just one line."];
[miView addSubview:miLabel];
UILabel *miDetailsLabel = [[UILabel alloc] init];
[miDetailsLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[miDetailsLabel setNumberOfLines:0];
[miDetailsLabel setText:#"Enough text to show 3 lines on an IP4, except first of three UILabels on my test code, with no content"];
[miView addSubview:miDetailsLabel];
UIButton *miButton = [[UIButton alloc] init];
[miButton setTranslatesAutoresizingMaskIntoConstraints:NO];
[miView addSubview:miButton];
NSArray *constraint_inner_h = [NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(0)-[label]-(10)-[button(52)]-(0)-|" options:0 metrics:nil views:#{#"label":miLabel, #"button":miButton}];
NSArray *constraint_inner2_h = [NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(0)-[details]-(10)-[button]-(0)-|" options:0 metrics:nil views:#{#"details":miDetailsLabel, #"button":miButton}];
NSArray *constraint_label_v = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-(0)-[label(18)]-(2)-[details(>=10)]-(0)-|" options:0 metrics:nil views:#{#"label":miLabel, #"details":miDetailsLabel}];
NSArray *constraint_button_v = [NSLayoutConstraint constraintsWithVisualFormat:#"V:[button(22)]" options:0 metrics:nil views:#{#"button":miButton}];
[miView addConstraint:[NSLayoutConstraint constraintWithItem:miButton attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:miView attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0.0]];
[miView addConstraints:constraint_inner_h];
[miView addConstraints:constraint_inner2_h];
[miView addConstraints:constraint_label_v];
[miView addConstraints:constraint_button_v];
I ve put a reduced version of the code.
any ideas of what I am missing?
Thanks
UPDATE : Thanks to Matt advice, I've tried this solution to set the proper value to preferredMawLayoutWidth:
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
NSArray *allKeys = [dictOpcionesTickets allKeys];
for (NSString *key in allKeys) {
NSArray *tmpArray = [dictOpcionesTickets objectForKey:key];
if (![[tmpArray objectAtIndex:0] isEqual:#""]) {
UILabel *tmpLabel = [tmpArray objectAtIndex:3];
tmpLabel.preferredMaxLayoutWidth = tmpLabel.frame.size.width;
NSLog(#"width: %f",tmpLabel.frame.size.width);
}
}
[self.view layoutIfNeeded];
}
To explain the code, as I said, I'm doing it dynamically, so I've created a dictionary with an array with the references to my UILabel (among other interesting information). When I run the code, I get the next log (with the code parsing 3 UILabel, first label with no content):
2014-12-28 20:40:42.898 myapp[5419:60b] width: 0.000000
2014-12-28 20:40:42.912 myapp[5419:60b] width: 0.000000
2014-12-28 20:40:43.078 myapp[5419:60b] width: 229.000000
2014-12-28 20:40:43.080 myapp[5419:60b] width: 229.000000
2014-12-28 20:40:43.326 myapp[5419:60b] width: 229.000000
2014-12-28 20:40:43.327 myapp[5419:60b] width: 229.000000
But I'm still getting the same result...the UIView is still showing a height equals to the minimum height set by the constraints, not showing the content of the UILabel.
UPDATE 2 Still fooling around.
I've tested my initial code but simplified on a fresh project in xcode 6, running on an actual iPhone 4 with iOS7, and it worked perfectly without setting preferredMaxLayoutWidth or subclassing UILabel, and even without calling layoutIfNeeded on parent view. But when it comes to the real project (I think it was originally builded in xcode 4 or 5) it does not work:
- (void)addLabelsDinamically {
self.labelFixed.text = #"Below this IB label goes others added dinamically...";
UIButton *miBoton = [[UIButton alloc] init];
miBoton.translatesAutoresizingMaskIntoConstraints = NO;
[miBoton setTitle:#"Hola" forState:UIControlStateNormal];
[self.viewLabels addSubview:miBoton];
[self.viewLabels addConstraint:[NSLayoutConstraint constraintWithItem:miBoton attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.viewLabels attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0.0]];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:[boton(22)]" options:0 metrics:nil views:#{#"boton":miBoton}]];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:[boton(40)]" options:0 metrics:nil views:#{#"boton":miBoton}]];
UILabel *miLabel = [[UILabel alloc] init];
miLabel.translatesAutoresizingMaskIntoConstraints = NO;
miLabel.backgroundColor = [UIColor redColor];
miLabel.numberOfLines = 0;
miLabel.text = #"ñkhnaermgñlkafmbñlkadnlñejtnhalrmvlkamnñnañorenoetñnngñsdbmnñgwn";
[self.viewLabels addSubview:miLabel];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(8)-[label]-(10)-[boton]-(8)-|" options:0 metrics:nil views:#{#"label":miLabel,#"boton":miBoton}]];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:[previous]-(8)-[label]" options:0 metrics:nil views:#{#"label":miLabel,#"previous":self.labelFixed}]];
UIView *pre = miLabel;
miLabel = [[UILabel alloc] init];
miLabel.translatesAutoresizingMaskIntoConstraints = NO;
miLabel.backgroundColor = [UIColor greenColor];
miLabel.numberOfLines = 0;
miLabel.text = #"ñkhnaermgñlkafmbñlkadnlñejtnhalrmvlkamnñnañorenoetñnngñsdbmnñgwn";
[self.viewLabels addSubview:miLabel];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(8)-[label]-(10)-[boton]-(8)-|" options:0 metrics:nil views:#{#"label":miLabel,#"boton":miBoton}]];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:[previous]-(8)-[label]" options:0 metrics:nil views:#{#"label":miLabel,#"previous":pre}]];
}
Ah, on the same screen I have one UILabel added on IB, with numberOfLines set to '0', vertical constraint "greater or equal than" and horizontal constraint set in a similar way (but both constraints set on IB)...and it works perfectly...this is driving me nuts!! any help???
Well, finally I've found the error, as I stated in the "UPDATE 2", it was very strange that it was working on an UILabel added via IB, but not with those added dynamically.
So, I looked again to my screen on IB, and found that I have an height constraint with "equal" relation, when I changed it to "greater or equal than" it all started to work!!!! Why I did not notice that the constraint was not "greater or equal than"? Because the view with the constraint was getting larger and larger as I was adding views with labels inside. Is that a bug?
Well, to summarize if someone find this useful. "How to add UILabels multi-line which adapts to its content?"
In iOS 6 versions it was a bug with "preferredMaxLayoutWidth", not getting the width once it was "layouted", and as a result of that programmers must set it via code (the best solution is doing it dynamically, an example of that I put it on my above question).
Fortunately on iOS7 and later, this has been solved, and you can rely only with constraints.
Adding via IB
Add the UILabel, and set "number of lines" to '0' (this will make the UILabel use as many lines as it needs).
Add the constraints, you need at least 3 constraints (pin to top or bottom, and both sides), the fourth will be height with a relation "greater or equal than".
Be sure than the view container has enough room, or also has a height constraint with a relation "greater or equal than".
Adding via code (just paste the code posted above):
UILabel *miLabel = [[UILabel alloc] init]; // Initialitze the UILabel
miLabel.translatesAutoresizingMaskIntoConstraints = NO; // Mandatory to disable old way of positioning
miLabel.backgroundColor = [UIColor redColor];
miLabel.numberOfLines = 0; // Mandatory to allow multiline behaviour
miLabel.text = #"ñkhnaergñsdbmnñgwn"; // big test to test
[self.viewLabels addSubview:miLabel]; // Add subview to the parent view
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(10)-[label]-(10)-|" options:0 metrics:nil views:#{#"label":miLabel}]]; // horizontal constraint
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|-(10)-[label]" options:0 metrics:nil views:#{#"label":miLabel}]];
UIView *pre = miLabel;
// Adding a second label to test the separation
miLabel = [[UILabel alloc] init];
miLabel.translatesAutoresizingMaskIntoConstraints = NO;
miLabel.backgroundColor = [UIColor greenColor];
miLabel.numberOfLines = 0;
miLabel.text = #"ñkhnaermgñlkafmbnoetñnngñsdbmnñgwn";
[self.viewLabels addSubview:miLabel];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(10)-[label]-(10)-|" options:0 metrics:nil views:#{#"label":miLabel,#"boton":miBoton}]];
[self.viewLabels addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:[previous]-(10)-[label]" options:0 metrics:nil views:#{#"label":miLabel,#"previous":pre}]];
Thanks to those who has tried to help me!! This site is amazing :)
This answer will work in a programmatic situation when you are added the text information dynamically and if this above is on a UICollectionViewCell or UITableViewCell.
In these situations you will need to update the layout and constraints on the contentView, then set the preferedWidth:
-(void) layoutSubviews
{
[super layoutSubviews];
[self.contentView setNeedsLayout];
[self.contentView layoutIfNeeded];
//locationName.preferredMaxLayoutWidth = locationName.frame.size.width;
//locationDetails.preferredMaxLayoutWidth = locationDetails.frame.size.width;
[super layoutSubviews];
}
This is similar to other answers where u are getting the new frame information and using that for the preferredMaxLayoutWidth then updating the view.
You will need constraints added to those views for the vertical as a start point and the UILabel need their numberOfLines = 0
On second thoughts setting he preferredMaxLayoutWidth in the layoutSubViews is poor solution if your width changes, as well as the height. Best to set this else where like the init for that cell. In some ways it might not be needed if you are constraining the width. This in my situation lead to the preferredMaxLayoutWidth changing each time that cell was set.
I'm trying the simplest thing but it's not working correctly. I have a MKMapView called mapView in a controller and in the viewDidLoad, I'm doing:
- (void)viewDidLoad
{
[super viewDidLoad];
CGRect myRect=CGRectMake(10.0f, 10.0f, 100.0f, 100.0f);
self.mapView.frame = myRect;
}
but the MKMapView is still taking up the whole controller screen. What am I doing wrong?
thx
If you have autolayout enabled, it will not pay attention to the frame. If you want to adjust the mapView size and/or position, I would turn off autolayout or add constraints in code.
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-(10)-[mapView(100)]" options:0 metrics:nil views:#{#"mapView" : self.mapView}]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|-(10)-[mapView(100)]" options:0 metrics:nil views:#{#"mapView" : self.mapView}]];
I'm trying to figure out how to resize UITextView (and everything actually) without losing constraints. Basically, I'm trying to layout a page where most components can have variable sizes (like description). I tried doing it with a simple use case where I have a UITextView and a UIButton underneath. I want to make sure that the position of the button is relative to the bottom of the UITextView.
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
CGRect frame = self.textView.frame;
int height = self.textView.contentSize.height;
frame.size.height = height;
self.textView.frame = frame;
}
What I ended up with is UITextView overlapping with UIButton. After doing a bit of research, it seems that if I replace the frame, all constraints are gone also. I tried copying the constraints over, but of course the pointer is still pointing at the old frame so that didn't help at all.
Is there a good way to solve a very dynamically laid out page? I'm trying to at least use interface builder rather than code everything.
EDITED
I tried updating the constraint as suggested, but that didn't actually resize the UITextView. Did I do it incorrectly? When I get the constant again, it's updated, but the height isn't changed visually. I did simplify my code by adding an IBOutlet for the constraint. Still no luck however.
int height = self.textView.contentSize.height;
self.textViewHeightConstraint.constant = height;
EDITED 2
I figured it out now. I had an extra constraint for the bottom and that was stopping me from actually resizing the UITextView.
The issue is how you've defined your button's top constraint. If it's to the label, when you adjust the label's height constraint, the button will move. For example, if doing it programmatically:
UILabel *label = [[UILabel alloc] init];
label.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:label];
label.text = #"Hello world";
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Submit" forState:UIControlStateNormal];
button.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:button];
NSDictionary *views = NSDictionaryOfVariableBindings(label, button);
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-[label]" options:0 metrics:nil views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|-[button]" options:0 metrics:nil views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|-[label]-[button]" options:0 metrics:nil views:views]];
NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:20];
[label addConstraint:heightConstraint];
Then, if you change the label's height constraint, the button will move:
heightConstraint.constant = 100;
[UIView animateWithDuration:1.0 animations:^{
[self.view layoutIfNeeded];
}];
If you've defined your UI in Interface Builder, select the button and check the top constraint of the button and make sure it's to the label, not the superview:
But, again, if the button's top constraint is to the label, when the label's height constraint changes, the button will move.
I've got a UIView ("superview") that has a couple of UILabels as subviews, set up in Interface Builder. I've got Auto-Layout turned on to properly space all the labels in a list, one after another. This works well.
What I'm trying to do now is make it so that my Superview resizes vertically to match the height of all my labels and I can't quite figure out how to do this.
How does this work?
Here's an example using visual layouts... so ignore the translatesAutoresizingMaskIntoConstraints business.
This relies on the fact that the container view does NOT have any height constraints and it seems to rely on the spacing between views. The system will resize the view to match the requirements of the subviews.
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor redColor];
[self setTranslatesAutoresizingMaskIntoConstraints:NO];
_labelOne = [[UILabel alloc] init];
_labelOne.text = #"Banana";
_labelOne.backgroundColor = [UIColor blueColor];
[_labelOne setTranslatesAutoresizingMaskIntoConstraints:NO];
_labelTwo = [[UILabel alloc] init];
_labelTwo.text = #"Dinosaur";
_labelTwo.backgroundColor = [UIColor yellowColor];
[_labelTwo setTranslatesAutoresizingMaskIntoConstraints:NO];
[self addSubview:_labelOne];
[self addSubview:_labelTwo];
NSDictionary *views = NSDictionaryOfVariableBindings(_labelOne, _labelTwo);
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[_labelOne]|" options:0 metrics:nil views:views]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[_labelTwo]|" options:0 metrics:nil views:views]];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|-10-[_labelOne(30)]-15-[_labelTwo(30)]-10-|" options:0 metrics:nil views:views]];
}
return self;
}
I know the basic idea is to have the intrinsic content size of your subviews drive the height of superview by making sure the content compression resistance and content hugging constraints in the vertical dimension for each subview are not being overridden by higher-priority constraints you have added.
Try use the UIView method sizeToFit?
I'm trying to generate a view in code. Here's the hierachy of my view object
UIScrollView
UIView
UIButton
The ScrollView should be the same size as the window.
The button should be as big as possible.
I'm using iOS auto layout, so the constraint strings for all of my objects look like this
H:|[object]|
V:|[object]|
I've also set translatesAutoresizingMaskIntoConstraints to NO for each object.
The problem is that the button only gets the default button-size. Its parent view object (UIView) only gets the size its subviews need.
red: UIScrollView / yellow: UIView
How can I force those views to be as big as the scrollView?
When I use a UIView instead of th UIScrollView everything works great...
Here's some code:
- (void) viewDidLoad {
[super viewDidLoad];
// SCROLL VIEW
UIScrollView* scrollView = [UIScrollView new];
scrollView.backgroundColor=[UIColor redColor];
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
//CONTAINER VIEW
UIView *containerView = [UIView new];
containerView.translatesAutoresizingMaskIntoConstraints = NO;
containerView.backgroundColor = [UIColor yellowColor];
[scrollView addSubview:containerView];
// CONSTRAINTS SCROLL VIEW - CONTAINER VIEW
[scrollView addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[containerView]|"
options:0 metrics:nil
views:#{#"containerView":containerView}]];
[scrollView addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[containerView]|"
options:0 metrics:nil
views:#{#"containerView":containerView}]];
// BUTTON
UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.translatesAutoresizingMaskIntoConstraints = NO;
[button setTitle:#"I'm way to small" forState:UIControlStateNormal];
[containerView addSubview:button];
// CONSTRAINTS CONTAINER VIEW - BUTTON
[containerView addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[button]|"
options:0 metrics:nil
views:#{#"button":button}]];
[containerView addConstraints:
[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[button]|"
options:0 metrics:nil
views:#{#"button":button}]];
self.view = scrollView;
}
UPDATE:
I really don't know, why this is happening. If you set up the view in IB, connect the outlets and instanciate the view in code, the scrollview behaves like a normal view (which bounces vertically). Its contentSize is not calculated correctly. More here. But how to do it correctly?
A couple of observations:
Constraints for subviews in scroll views don't work like constraints in other views. They're used to set the contentSize of the scroll view. (See TN2154.) That way, you throw a bunch of stuff on a scroll view, set the constraints for the stuff inside it, and the contentSize is calculated for you. It's very cool feature, but it's antithetical to what you're trying to do here.
Worse, buttons will, unless you set an explicit constraint for their width and height of a button, will resize according to their content.
The net effect of these two observations is that your existing constraints say "(a) set my container to be the size of my button; (b) let my button resize itself dynamically to the size of the text; and (c) set my scrollview's contentSize according to the size of my container (which is the size of the button)."
I'm unclear as to what the business problem is. But here are some constraints that achieve what I think your technical question was:
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *view = self.view;
UIScrollView *scrollView = [[UIScrollView alloc] init];
scrollView.backgroundColor = [UIColor redColor]; // just so I can see it
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:scrollView];
UIView *containerView = [[UIView alloc] init];
containerView.backgroundColor = [UIColor yellowColor]; // just so I can see it
containerView.translatesAutoresizingMaskIntoConstraints = NO;
[scrollView addSubview:containerView];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.translatesAutoresizingMaskIntoConstraints = NO;
[button setTitle:#"I'm the right size" forState:UIControlStateNormal];
[containerView addSubview:button];
NSDictionary *views = NSDictionaryOfVariableBindings(scrollView, button, view, containerView);
// set the scrollview to be the size of the root view
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[scrollView]|"
options:0
metrics:nil
views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[scrollView]|"
options:0
metrics:nil
views:views]];
// set the container to the size of the main view, and simultaneously
// set the scrollview's contentSize to match the size of the container
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[containerView(==view)]|"
options:0
metrics:nil
views:views]];
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[containerView(==view)]|"
options:0
metrics:nil
views:views]];
// set the button size to be the size of the container view
[containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:|[button(==containerView)]"
options:0
metrics:nil
views:views]];
[containerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[button(==containerView)]"
options:0
metrics:nil
views:views]];
}
Frankly, I don't understand the business intent of your UI, as this feels like a contortion of auto layout to achieve a very simply UI. I don't know why you have a scroll view if you have "screen sized" content in it (unless you were paging through buttons). I don't know why you'd have a content view with a single item in it. I don't understand why you're using a full-screen button (I'd just put a tap gesture on the root view at that point and call it a day).
I'll assume you have good reasons for all of this, but it might make sense to back up, ask what is your desired user experience is, and then approach the problem fresh to see if there's a more efficient way to achieve the desired effect.