iOS添加到购物车的简单动画效果

#pragma mark - 添加到购物车的动画效果
// huangyibiao
- (void)addAnimatedWithFrame:(CGRect)frame {
  // 该部分动画 以self.view为参考系进行
  frame = [[UIApplication sharedApplication].keyWindow  convertRect:frame fromView:self.RFcell.headBtn];
  UIButton *move = [[UIButton alloc] initWithFrame:frame];
  [move setBackgroundColor:UIColorFromRGB(0xFFA215)];
  [move setTitle:self.RFcell.headBtn.currentTitle forState:UIControlStateNormal];
  [move setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
  move.contentMode = UIViewContentModeScaleToFill;
  [[UIApplication sharedApplication].keyWindow addSubview:move];
  // 加入购物车动画效果
  [UIView animateWithDuration:1.2 animations:^{
    move.frame = CGRectMake(320 - frame.size.width  - 20, 24,
                            frame.size.width, frame.size.height);
  } completion:^(BOOL finished) {
    [move removeFromSuperview];
    if (self.cartCategoriesLabel == nil) {
      self.cartCategoriesLabel = [[UILabel alloc] initWithFrame:CGRectMake((16 - 8) / 2, (16 - 8) / 2, 8, 8)];
      self.cartCategoriesLabel .textColor = [UIColor whiteColor];
      self.cartCategoriesLabel .backgroundColor = [UIColor clearColor];
      self.cartCategoriesLabel .textAlignment = NSTextAlignmentCenter;
      self.cartCategoriesLabel .font = [UIFont systemFontOfSize:9];
      UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(15, 8, 16, 16)];
      imgView.image = [UIImage imageNamed:@"news"];
      [imgView addSubview:self.cartCategoriesLabel];
      [self.cartButton addSubview:imgView];
    }
    self.cartCategoriesLabel .text = [NSString stringWithFormat:@"%d", _cartCategories.count];
  }];
  
  return;
}

frame参数是按钮的frame，也就是原来所在父视图上的Frame

这里会将原来的frame转换成window上的frame

在动画完成后，更新显示购物车中的商品种类数