iphone - 如何控制 Retina 显示屏的图像？
我的应用程序将下载图像并将其显示到 UIImageView 中。
图像相当大，比如 600 * 600，而 UIImageView 的大小是 100 * 100。 因此，当显示图像时，我设置 UIImageView 来缩放它以适合。
我的问题是
对于iPhone 3Gs，我理解图像直接缩放到100 * 100并显示在UIImageView中。
但 iPhone 4 呢？当我执行imageView.image = image时，iOS会自动将图像先缩放到200 * 200，然后将其显示在100 * 100 imageView中吗？
我的意思是我应该做一些额外的事情来确保视网膜显示屏适应吗？
谢谢
My app will download a image and display it into a UIImageView.
The image is quite large, say 600 * 600 and the UIImageView's size is 100 * 100.
So when the image is displayed, I set the UIImageView to scale it to fit.
My question is
For iPhone 3Gs, I understand the image is scaled to 100 * 100 directly and displayed in UIImageView.
But what about iPhone 4? When I do imageView.image = image, will iOS automatically scale the image to 200 * 200 first and then display it in 100 * 100 imageView?
I mean should I do anything extra to make sure that the Retina display is adapted?
Thanks
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在这种情况下，不，您不需要做任何特别的事情。如果您的 UIImageView 配置良好（缩放以适合，就像您所做的那样），iPhone4 将在 100x100 点 UIImageView 中显示缩放为 200x200 像素的图像。无需下载不同的“[电子邮件受保护]”图像。
In this case, no, you needn't do anything particular. If your UIImageView is well configured (scale to fit, as it seems you've done), an iPhone4 will display your image scaled at 200x200 pixels in a 100x100 points UIImageView. No need either to download a different "[email protected]" image.
您不必在这里执行任何具体操作。您的图像将由 UIKit 进行适当缩放，事实上，受 Retina 显示屏影响的是
UIImageView，而不是您的图像。您指定的尺寸为 100 x 100，该尺寸在非 Retina 显示器上适用，但在表面下方的 Retina 显示器上，物理尺寸实际上为 200 x 200，因为它会考虑scaleFactor。无论哪种方式，
UIImageView都会相应地缩放图像。You don't have to do anything specific here. Your image will be scaled appropriately by UIKit and in fact it's the
UIImageViewwhich will be affected by the Retina display, not your image. You specify a size of 100 x 100 which on non-Retina displays will hold true, but on Retina displays under the surface the physical size will actually be 200 x 200 because it'll take into account thescaleFactor.Either way, the
UIImageViewwill scale the image accordingly.我有一个经验，它的工作方式相反......所以缩放它的视网膜和 iPhone 3G 或 3GS 将正确显示它。
I have an experience that it works opposite way..so scale it for retina and iphone 3G or 3GS will display it correctly.