更新时间:2023-02-02 15:04:17
您需要包括alpha通道进入你的位图: UIGraphicsBeginImageContextWithOptions(...,NO,...)
如果你想看到角落背后的东西。
You need to include alpha channel into your bitmap: UIGraphicsBeginImageContextWithOptions(..., NO, ...)
if you want to see what is behind the corners.