//初始化
GoodsAttrViewController *goodsAttr = (GoodsAttrViewController*)[mainStoryboard instantiateViewControllerWithIdentifier:@"goodsAttr"];
//设置背景色(alpha:0.5)
goodsAttr.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
if ([[[UIDevice currentDevice]systemVersion]floatValue]>= 8.0) {
goodsAttr.modalPresentationStyle = UIModalPresentationOverFullScreen;
} else {
self.modalPresentationStyle = UIModalPresentationFullScreen;
}
//模态出
[self.navigationController showDetailViewController:goodsAttr sender:nil];
