小编Abh*_*hra的帖子

我有一个与iPhone中的pdf绘图有关的问题.当我在ipad中绘制pdf时它工作正常,但在iphone页面图像质量不好.该图像在灰色背景处包含黑点.
任何人都可以帮我解决这个问题吗？

谢谢.

- (UIImage *) imageForPageIndex:(NSUInteger)pageIndex {
    UIImage *image = nil;
    if ([delegate illustration_Enable])
    {
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGContextRef context = CGBitmapContextCreate(NULL, 
                                                     pageSize.width, 
                                                     pageSize.height, 
                                                     8,                     /* bits per component*/
                                                     pageSize.width * 4,    /* bytes per row */
                                                     colorSpace, 
                                                     kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
        CGColorSpaceRelease(colorSpace);
        CGContextClipToRect(context, CGRectMake(0, 0, pageSize.width, pageSize.height));

        [self renderPageAtIndex:pageIndex OnContext:context];

        CGImageRef cgimage = CGBitmapContextCreateImage(context);
        CGContextRelease(context);
        image = [UIImage imageWithCGImage:cgimage];
        CGImageRelease(cgimage);
    }
    else 
    {
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGContextRef context = CGBitmapContextCreate(NULL, 
                                                     pageSize.width, 
                                                     pageSize.height, 
                                                     8,                     /* bits per component*/ …