Cannot update during an existing state transition warning

[Aryk]

I believe it's coming from here:

    // 保存 imageSize
    const saveImageSize = () => {
      // 如果已经 success 了，就不做处理
      if (this!.state!.imageSizes![index] && this!.state!.imageSizes![index].status !== 'loading') {
        return;
      }

      const imageSizes = this!.state!.imageSizes!.slice();
      imageSizes[index] = imageStatus;
      this.setState({ imageSizes });
    };