iOS_ 摸推背景透明效果

ScreenListVC  * screenList = [[ScreenListVC alloc] init];
    if ([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) {
        screenList.modalPresentationStyle=UIModalPresentationOverCurrentContext;
    }else{
        self.modalPresentationStyle=UIModalPresentationCurrentContext;
    }
    [self presentViewController:screenList animated:YES completion:^(void){
        screenList.view.superview.backgroundColor = [UIColor clearColor];// 背景色透明

    }];

 看代码就行吧, 应该不用是说 啥, 我感觉我发的东西都挺简单的,  大牛什么的有别的想法可以留下你们的地址, 让小弟也学习学习,