Can you enter a constraint value with decimal in IB?

Question

Here is to hoping it is a simple setting.

I cannot enter a constraint value with decimals in IB. Whenever I enter a value with decimals and press enter, the system rounds it!

I don't have this problem when creating constraints in code. Only in IB.

Is there a way?

Answer 1

Yes, you can.

1. Enter the value with a "f" postfix like this:

2. Click Priority. notice how the effective constraint value changes to 0.5:

3. Hit ESC

Answer 2

It has to be done programmatically, I believe. As of Xcode 6.3, constraint constant values seem to be restricted to integers in the storyboard editor (unlike multiplier values, which can be decimals).

For Googlers, here's how to do it:

To specify a decimal value for a constraint defined in a storyboard, you can set the constant property of a constraint iVar. Here's an example of setting a height constraint to 0.5f:

In your header:

@property (nonatomic, retain) IBOutlet NSLayoutConstraint *separatorHeightConstraint;

then connect the IBOutlet to the constraint in the storyboard.

In your implementation:

-(void)layoutSubviews {
    [super layoutSubviews];
    self.separatorHeightConstraint.constant = 0.5f;
}

That's all!