模态半透明

[ToolClass CurrentInterface:self.view.window.layer time:0.2 type:kCATransitionFade subtype:kCATransitionFromBottom];//动画
        EnterPassword *psw=[[EnterPassword alloc]init];
        psw.modalPresentationStyle = UIModalPresentationOverFullScreen;
        psw.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
        [self presentViewController:psw animated:NO completion:^{
            psw.view.backgroundColor = [[UIColor clearColor] colorWithAlphaComponent:0.3];
        }];