将UIView转换为UIImage会产生较差的质量 [英] Converting UIView to UIImage gives poor quality

问题描述

我正在使用以下代码将UIView捕获为UIImage并将其保存在Docs Dir中.

I am using the following code to capture a UIView as a UIImage and save it in Docs Dir.

- (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

UIImage已成功保存.但是，分辨率非常差.请参阅下图以供参考.如何确保按照原始​​图像保留分辨率?

The UIImage is successfully saved. However the resolution is very poor. See the image below for reference. How do I make sure the resolution is retained as per the original image?

推荐答案

使用 UIGraphicsBeginImageContextWithOptions 代替 UIGraphicsBeginImageContext

UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0.0);

告诉我它是否有效:)

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