refreshView是Xib,,用UINib加载Xibspa
let nib = UINib(nibName: "RefreshView", bundle: nil) return nib.instantiateWithOwner(nil, options: nil)[0] as! RefreshView
给xib设置约束的时候必定要重写赋值size,,用当前的大小赋值便可,,若是不设置,,位置可能不对的code
refreshView.snp_makeConstraints { (make) -> Void in // make.centerX.equalTo(self.snp_centerX) // make.centerY.equalTo(self.snp_centerY) make.center.equalTo(self.snp_center) make.size.equalTo(refreshView.bounds.size) }