UIGraphicsGetImageFromCurrentImageContext（）Retina分辨率？ [英] UIGraphicsGetImageFromCurrentImageContext() Retina resolution?

问题描述

我正在拍照并使用 UIGraphicsGetImageFromCurrentImageContext（）来操作它。一切都工作很好。然而，在iPhone 4上，分辨率看起来很不舒服，因为它使用的图像似乎是标准分辨率，而不是@ 2x。是否有任何方法可以提高生成的图片的分辨率？

  UIGraphicsBeginImageContext（self.view.bounds.size）; 
 [self.view.layer renderInContext：UIGraphicsGetCurrentContext（）]; 
 UIImage * image = UIGraphicsGetImageFromCurrentImageContext（）; 
 UIGraphicsEndImageContext（）; 
    你应该使用 UIGraphicsBeginImageContextWithOptions ，它允许您设置缩放因子。使用比例因子0.0f可使用设备的比例因子。
 
I'm taking a picture of my screen and manipulating it by using UIGraphicsGetImageFromCurrentImageContext().  Everything is working just fine.  However, on an iPhone 4, the resolution looks pretty shabby as it seems like the image it uses is standard resolution, not @2x.  Is there any way to increase the resolution of the resulting image?
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

解决方案
You should use UIGraphicsBeginImageContextWithOptions which allows you to set the scale factor.  Use a scale factor of 0.0f to use the device's scale factor.

                        
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