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我正在使用渲染drawRect,但第一次我总是得到错误:
drawRect
<错误>:CGImageCreateWithImageProvider:无效的图像大小:768 x 768。
768 x 768
我用尺寸绘制图像768x500。第一次图像不绘制到上下文中,但下一次它是绘制。
768x500
它是什么 ?