我通过拍摄UIView的截图来创建PDF,目前在带有视网膜显示屏的iPad3上工作得很好,但是当在其他具有较低分辨率屏幕的设备上进行测试时,我遇到文本分辨率问题.
这是我的代码：
//start a new page with default size and info
//this can be changed later to include extra info.
UIGraphicsBeginPDFPage();
//render the view's layer into an image context
//the last option specifies scale. If 0,it uses the devices scale.
UIGraphicsBeginImageContextWithOptions(view.bounds.size,view.opaque,2.0);
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//render the screenshot into the pdf page CGContext
[screenShot drawInRect:view.bounds];
//close the pdf context (saves the pdf to the NSData object)
UIGraphicsEndPDFContext();
我还尝试将UIGraphicsBeginImageContextWithOptions比例设置为2.0,但这没有任何改变.如何强制iPad2上的视图以2倍的分辨率渲染？
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