2017年1月6日 | Leave a comment 问题： VFL 中如何表示规则应用于纵向 解决： 使用”V:”。 如： “V:|-[titleLabel]-|” let views = ["titleLabel":titleLabel,"contentLabel":contentLabel] self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|-[titleLabel]-|", options: [], metrics: nil, views: views)) self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|-[contentLabel]-|", options: [], metrics: nil, views: views)) self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-[titleLabel]-[contentLabel]-|", options: [], metrics: nil, views: views)); 1234 let views = ["titleLabel":titleLabel,"contentLabel":contentLabel] self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|-[titleLabel]-|", options: [], metrics: nil, views: views)) self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|-[contentLabel]-|", options: [], metrics: nil, views: views)) self.contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-[titleLabel]-[contentLabel]-|", options: [], metrics: nil, views: views)); 参考： http://www.jianshu.com/p/bab69690cb1a