UIImageView *assetImageView = [[UIImageView alloc] initWithFrame:viewFrames];
[assetImageView setContentMode:UIViewContentModeScaleToFill];
[assetImageView setImage:[UIImage imageWithCGImage:[self.asset thumbnail]]];
[self addSubview:assetImageView];
此代码会因质量下降而产生模糊图像 我发现我需要使用这个
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
但我如何在我的案例中应用此代码?