从URL加载时应如何处理视网膜/正常图像？

本文介绍了从URL加载时应如何处理视网膜/正常图像？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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:@"www.example/images/yourImage@2x.png"]; NSData * imageData = [NSData dataWithContentsOfURL:imageURL]; image = [UIImage imageWithData:imageData]; } else { // @1x NSURL *imageURL = [NSURL URLWithString:@"www.example/images/yourImage.png"]; NSData * imageData = [NSData dataWithContentsOfURL:imageURL]; image = [UIImage imageWithData:imageData]; } UIImageView *yourImageView = [[UIImageView alloc] initWithImage:image];