SnapKit使用

https://github.com/SnapKit/SnapKit

iconView.snp_makeConstraints { (make) -> Void in
        make.centerX.equalTo(self.snp_centerX)
        make.centerY.equalTo(self.snp_centerY).offset(-60)
        }
        
        
homeIconView.snp_makeConstraints { (make) -> Void in
        make.center.equalTo(iconView.snp_center)
        }
        
        
messageLabel.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(iconView.snp_centerX)
            make.top.equalTo(iconView.snp_bottom).offset(16)
            make.width.equalTo(224)
            make.height.equalTo(36)
        }