SDAutoLayerOut

    UIView *vi = [UIView new];
    vi.backgroundColor = [UIColor redColor];
    [self.view addSubview:vi];
    vi.sd_layout
    .leftSpaceToView(self.view,20)
    .rightSpaceToView(self.view,20)
    .topSpaceToView(self.view,30)
    .bottomSpaceToView(self.view,20);