摘要：
首先CGImageRef与UIImage相互转换//CGImageRef转换成UIImage CGImageRef iOffscreen = CGBitmapContextCreateImage(context);UIImage* image = [UIImage imageWithCGImage: iOffscreen]; //UIImage转换成CGImageRef UIImage *loadImage=[UIImage imageNamed:@"comicsplash.png"];CGImageRef cgimage=loadImage.CGImage;之所以需要转换 阅读全文