SnapKit更新约束-Swift3.0

导入SnapKit

import SnapKit

修改约束

var snpCenterX: Constraint?
var snpCenterY: Constraint?
 /// 偏移量，默认 0
var offset:CGPoint = .zero {
    didSet {
        snpCenterX?.update(offset: offset.x)
        snpCenterY?.update(offset: offset.y)
    }
}

建立约束

viewTips.snp.makeConstraints { (make) in
    /// 这个一会要加上偏移量
    self.snpCenterX = make.centerX.equalTo(self).offset(offset.x).constraint
    self.snpCenterY = make.centerY.equalTo(self).offset(offset.y).constraint
}