从URL加载时应如何处理视网膜/正常图像？ [英] How should retina/normal images be handled when loading from URL?

问题描述

我了解如何以编程方式从网址为我的应用加载图片，而不是将其打包在应用内，但如何处理1x vs 2x问题？如果需要，我可以从外部源提供这两个版本，但在设置UIImage时如何处理？

I understand how to programmatically load images for my app from a URL instead of packaging them within the app but how do I handle the 1x vs 2x issue? I can serve both versions from the external source if need be but how do I handle that when setting the UIImage?

推荐答案

我'我很确定你无法以自动方式远程加载@ 2x图像文件。您将必须测试视网膜显示，然后获得适当的图像，如下所示：

I'm pretty sure you cannot load @2x image files remotely in an automated way. You will have to test for the retina display and then get the appropriate image(s), like so:

UIImage *image;
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2){
  // @2x
  NSURL *imageURL = [NSURL URLWithString:@"http://www.example.com/images/[e-mail]"];
  NSData * imageData = [NSData dataWithContentsOfURL:imageURL];
  image = [UIImage imageWithData:imageData];
} else {
  // @1x
  NSURL *imageURL = [NSURL URLWithString:@"http://www.example.com/images/yourImage.png"];
  NSData * imageData = [NSData dataWithContentsOfURL:imageURL];
  image = [UIImage imageWithData:imageData];
}
UIImageView *yourImageView = [[UIImageView alloc] initWithImage:image];

这篇关于从URL加载时应如何处理视网膜/正常图像？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IT屋！