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i did coding on xcode :
UIView *airView;
UIViewController *vcl;
vcl = [[[UIApplication sharedApplication] keyWindow] rootViewController];
airView = vcl.view;
airView.backgroundColor = [UIColor clearColor];
[self.freRootView addSubview:self.readerView];
[self.freRootView sendSubviewToBack:self.readerView];
but, got a gray background.