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i am using below code for fill rgba forful view. but i am getting half(1/2) width only. anybody please inform me anything wrong with my code. 

             CGContextRef bitmap = CGBitmapContextCreate(
             rgba,
             width,     // width = 320
             height,        // 460
             8               //CGImageGetBitsPerComponent(imageRef),    
             4 * width, // rowbytes
             colorSpace,
             kCGImageAlphaNoneSkipLast);
             );
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1 回答 1

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尝试使用：width * [UIDevice currentDevice].scale代替width和height * [UIDevice currentDevice].scale代替height。

请记住，您的设备可以有 Retina 屏幕，而您的 320 像素视图实际上是 640 像素视图。（规模 = 2）

于 2012-09-25T10:05:02.840 回答