OC_Model控制器需要设置参数才可以设置背景颜色

GFBSetWalletPasswordVC *setWalletPasswordVC = [[UIStoryboard storyboardWithName:@"Setting" bundle:nil] instantiateViewControllerWithIdentifier:@"GFBSetWalletPasswordVC"];
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {**
    setWalletPasswordVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;**
}else{
    self.modalPresentationStyle = UIModalPresentationCurrentContext;**
}
[self presentViewController:setWalletPasswordVC animated:NO completion:^{
}];