How to get the height constraint declared by snapkit for UIView?

Question

For example, I declare some constraints through snapkit for a UIView:

timeProgress.snp_makeConstraints { (make) in
  make.left.equalTo(startTime.snp_right).offset(15)
  make.right.equalTo(endTime.snp_left).offset(-15)
  make.height.equalTo(5)
  make.centerY.equalTo(startTime)
}

How can I get the height constraint for the timeProgress?

score 4 · Answer 1 · answered Jan 07 '20 at 17:32

You can hold a reference to the height constraint:

var timeHeightConstraint: Constraint

timeProgress.snp_makeConstraints { (make) in
    make.left.equalTo(startTime.snp_right).offset(15)
    make.right.equalTo(endTime.snp_left).offset(-15)
    self.timeHeightConstraint = make.height.equalTo(5).constraint
    make.centerY.equalTo(startTime)
}

score 2 · Accepted Answer · answered Aug 09 '16 at 03:34

2

You need to keep a global reference to the constraint.

let timeProgressHeightConstant = 5.0

timeProgress.snp_makeConstraints { (make) in
    make.left.equalTo(startTime.snp_right).offset(15)
    make.right.equalTo(endTime.snp_left).offset(-15)
    make.height.equalTo(timeProgressHeightConstant)
    make.centerY.equalTo(startTime)
}

Hence, you could now access self.timeProgressHeightConstant.

answered Aug 09 '16 at 03:34

Zigii Wong

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Thanks！But i also want know how can I get the width constraint for it? – tongxing Aug 09 '16 at 03:46
@tongxing There is no shortcut to get the width constraint in this case. You need to calculate yourself manually. – Zigii Wong Aug 09 '16 at 03:50

How to get the height constraint declared by snapkit for UIView?

2 Answers2