思路：自定义View【支付选择框】，加在 window上，创建一个 蒙版 VIew，加在window 上， 通过 UIVIew 动画 实现弹出 效果

ps: 也可以将蒙版 和 支付框 写成 懒加载

代码：

选择框。h：
typedef void(^dismissViewBlock)();
@property(nonatomic, copy) dismissViewBlock dismissBlock;

选择框。m： 布局代码自己布局

• (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
  [UIView animateWithDuration:0.5 animations:^{
  self.frame = CGRectMake(0, JKScreenHeight, JKScreenWidth, JKScreenHeight);
  self.dismissBlock();

  }];
  }

控制器。m ：

// 缴费按钮点击

• (void)payButtonClick:(UIButton *)sender{
  [self.view setUserInteractionEnabled:NO];
  _maskView.frame = CGRectMake(0, 0, JKScreenWidth, JKScreenHeight);
  [UIView animateWithDuration:0.5 animations:^{
  _payView.frame = CGRectMake(0, 0, JKScreenWidth, JKScreenHeight);
  _maskView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];

  }];

}

pragma mark - 支付界面

• (void)setupPayView{

  RSMeMyNewsRegistrationPayForView * payView = [[RSMeMyNewsRegistrationPayForView alloc] initWithFrame:CGRectMake(0, JKScreenHeight, JKScreenWidth, JKScreenHeight)];

  [[UIApplication sharedApplication].keyWindow addSubview:payView];
  payView.dismissBlock = ^{
  [self dismissMaskView];
  };
  self.payView = payView;
  }

pragma mark - 蒙版

• (void)setupMaskView{

  UIView * maskView = [[UIView alloc] initWithFrame:CGRectMake(0, JKScreenHeight, JKScreenWidth, JKScreenHeight)];
  [[UIApplication sharedApplication].keyWindow addSubview:maskView];

  /添加手势事件,移除View/
  UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissMaskView)];
  [maskView addGestureRecognizer:tapGesture];

  self.maskView = maskView;
  }

//隐藏蒙版

• (void)dismissMaskView{

  [self.view setUserInteractionEnabled:YES];
  [UIView animateWithDuration:0.5 animations:^{
  _maskView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0];
  } completion:^(BOOL finished) {
  if (finished) {
  _maskView.frame = CGRectMake(0, JKScreenHeight, JKScreenWidth, JKScreenHeight);
  }
  }];

}