是否可以在不损失质量的情况下调整UIImage的大小？

p> 更新：我在图像上附加了前后（已由用户在imageview中缩放），以及在使用上述方法调整尺寸后的外观。 解决方案我遇到了同样的问题之后，我使用以下代码来修复它： CGFloat比例= 1.0; if（[[[UIScreen mainScreen] respondsToSelector：@selector（scale）]）{ CGFloat tmp = [[UIScreen mainScreen] scale]; if（tmp> 1.5）{ scale = 2.0; } } if（scale> 1.5）{ UIGraphicsBeginImageContextWithOptions（targetSize，NO，scale）; } else { UIGraphicsBeginImageContext（targetSize）; } I have a UIImage that I put in a UIImageView which has a pinch gesture recognizer attached to it which I use to scale the image. When I scale the image in the UIImageView, there is no distortion and it scales perfectly. However, I need to resize the UIImage while not in the UIImageView, and when I do this using the following code, the result is slightly skewed:CGFloat width = self.imageView.frame.size.width;CGFloat height = self.imageView.frame.size.height;UIGraphicsBeginImageContext(CGSizeMake(width, height));[self.image drawInRect:CGRectMake(0, 0, width, height)];UIImage *resizedImage = [UIGraphicsGetImageFromCurrentImageContext() retain];UIGraphicsEndImageContext();As you can see I'm taking the height and width from the imageView, because that is what the image needs to be scaled to.I know that it has to be possible to scale it perfectly if the imageView is able to do this, does anyone happen to know what I'm doing incorrectly?UPDATE: I attached a before / after of an image (which has been rescaled by the user in an imageview) and how it looks after I resized it using the above method. 解决方案 I had this same issue, I used the following code to help fix it: CGFloat scale = 1.0;if([[UIScreen mainScreen]respondsToSelector:@selector(scale)]) { CGFloat tmp = [[UIScreen mainScreen]scale]; if (tmp > 1.5) { scale = 2.0; }}if(scale > 1.5) { UIGraphicsBeginImageContextWithOptions(targetSize, NO, scale);} else { UIGraphicsBeginImageContext(targetSize);} 这篇关于是否可以在不损失质量的情况下调整UIImage的大小？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！