xxxController中view的起始位置上移，被导航栏遮挡，UIImagePickerController 内容被导航栏遮挡_uidocumentpickerviewcontroller内容上移

为了适配iOS11下来刷新下下偏移问题，适配：

    if (@available(iOS 11.0,*)) {
        [UITableView appearance].estimatedRowHeight = 0;
        [UITableView appearance].estimatedSectionHeaderHeight = 0;
        [UITableView appearance].estimatedSectionFooterHeight = 0;
        [UIScrollView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }

导致问题：

1.storyboard默认创建的xxxController中view起始位置在导航栏上面

解决：

创建的xxxController去掉红色框中的钩

2.UIImagePickerController

UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
/*****....*****/
imagePickerController.navigationBar.translucent = NO;//将导航条的毛玻璃效果去除掉就可以了,解决上移问题
[self presentViewController:imagePickerController animated:YES completion:nil];

增加代码imagePickerController.navigationBar.translucent = NO;(将导航条的毛玻璃效果去除掉就可以了)