blocks|key|67435|text|在我的测试中，我发现@3x在iOS+7及更低版本上无法识别。因此，如果你计划支持iOS+7和8，你肯定会想要包含@2x的图片。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|67436|至于这些图像的分辨率，我还没有找到一个令人满意的答案。对于我正在开发的应用程序，以全屏jpg+(可能是一张照片)为例，我将@3x保存为1242x2208，@2x保存为750x1334，以匹配这些图像在iPhone上显示的最高分辨率。这不是一个像素完美的解决方案，因为图像需要在非iPhone6(%2B)上缩小，但我认为这是一个很好的折中方案，不涉及太多额外的if语句，该语句指示哪个图像基于屏幕尺寸(ugh)和5个不同的图像。|67437|关于dfmuir提出的性能问题，需要注意的一点是，这些图像在很多情况下都会被缩小，4/4S、5/5S、6/6%2B在显示缩放模式下，即使你采用苹果的首选方法，包括@1x、@2x和@3x的3个图像，因为我们现在有5个(或6个包括3gs)不同的分辨率(更多信息请参见以下图表中的渲染像素行：http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions)。|offset|length|67438|如果你的图片是与点相关的(所以不考虑UI元素)，你唯一不会遇到这些问题的方法是让你的图片与点相关(所以相对于拇指而不是手机的屏幕尺寸保持相同的大小)，但这对应用的设计并不总是有意义的。例如，在较低分辨率的手机上裁剪，而不是缩小。|67439|entityMap|0|LINK|mutability|MUTABLE|url|http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions^0|0|0|3X|1X|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$F|U|G|V|1|W]]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

In my testing, I've found @3x isn't recognized on iOS 7 and below. So if you plan to support iOS 7 &amp; 8, you'll definitely want to include @2x images.

As for the resolution of said images, I haven't found a satisfactory answer yet. For the app I'm working on, taking the example of a fullscreen jpg (likely a photo), I would save at 1242x2208 for @3x and 750x1334 for @2x to match the highest resolution those images will be displayed at on an iPhone. It's not a pixel perfect solution since the images will need to be scaled down on non-iPhone 6(+)'s but I think it's a good middle ground that doesn't involve too much extra work with if statements dictating which image based on the screen size (ugh) and 5 different images.

One thing to note about performance concerns dfmuir brings up is that these images are going to end up being scaled down in a lot of cases, 4/4S, 5/5S, 6/6+ in display zoom mode, even if you go with apple's preferred method of including 3 images at @1x, @2x, and @3x, since we now have 5 (or 6 including 3gs) different resolutions (See the rendered pixels row in this chart for more info: <a href="http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions" rel="nofollow">http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions</a>)

The only way you don't get these issues with photo-like images (so not considering UI elements), is if you design it such that your images are in relation to points (so staying the same size relative to say your thumb instead of relative to the phone's screen size), but that doesn't always make sense for the app's design. An example would be cropping on the lower resolution phones instead of being scaled down.

blocks|key|67543|text|需要注意的是@3x已经被设备缩小了。3是UIDevice+scale，而屏幕在某种意义上实际上是nativeScale。因此，如果这个论点成立，那么从@3x开始，它应该也适用于其他密度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|67544|当然，如果图像有相当多的锐角，并且只有一个像素位于角部，则可能需要精确定位它，而不是让操作系统通过应用要应用于缩小比例的任何连续过滤器来拾取它。|67545|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

One thing to note is that @3x is already downscaled by the device. 3 is UIDevice scale whereas the screen is actually at, in some sense, nativeScale. So, if the argument holds, it should do a proper job for other densities as well from @3x.

Of course, if the image has quite a few sharp corners with just a single pixel sitting at the corners, one may want to precisely position it instead of letting the OS pick it via applying whatever continuous filter it is going to apply to downscale.

In an effort to reduce bundle size, is it possible (and a good idea) to only add @3x images? 

To clarify, I'm not referring to the app icon, launch image, etc. But images that are internal to the app, like UIButton background images.

I saw <a href="https://stackoverflow.com/questions/25781422/image-resolution-for-new-iphone-6-and-6-3x-support-added">Image resolution for new iPhone 6 and 6+, @3x support added?</a>, but it didn't answer my question.

For an iPhone only, iOS 7+ app, can we include only @3x images?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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为了减少捆绑包的大小，是否有可能(也是一个好主意)只添加@3x图像？为了澄清，我指的不是应用程序图标、启动图像等，而是应用程序内部的图像，如UIButton背景图像。我看到了，但它没有回答我的问题。

问对于仅限iPhone的iOS 7+应用程序，我们可以只包含@3x图片吗？
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问对于仅限iPhone的iOS 7+应用程序，我们可以只包含@3x图片吗？EN

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问对于仅限iPhone的iOS 7+应用程序，我们可以只包含@3x图片吗？
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