blocks|key|52478|text|Images.xcassets可以选择为iPhone+5(视网膜4+@2x)、iPhone+6(@2x)和iPhone+6+plus(3x)提供单独的图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52479|​|52480|📷|atomic|offset|length|52481|52482|没有iPhone+4资源的选项(苹果可能停止了对iPhone+4的支持)，而是iPhone+4也需要2倍的图像(缩放模式)，但你可以做一些类似于This+post的iPhone+4的操作|52483|更新Xcode+7|52484|现在在Xcode7中，Images.xcassets没有单独的图像选项，我们必须为所有视网膜设备使用相同的2x图像，为Retina+HD设备使用3x图像|52485|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/590e9e712b5e8ff2424fa1d1f326d0e9.png|imageAlt|1|LINK|MUTABLE|url|https://stackoverflow.com/questions/26604477/xcode-6-asset-catalog-iphone-6#answer-28457343^0|0|0|0|1|0|0|0|20|9|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|15|8|@]|9|@$G|16|H|17|1|18]]|A|$]]|$1|I|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1A|8|@]|9|@$G|1B|H|1C|1|1D]]|A|$]]|$1|L|3|M|5|6|7|1E|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1F|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]|Y|$5|Z|T|10|A|$11|12]]]]

Images.xcassets has option to provide separate image for iPhone 5(Retina 4 @2x), iPhone 6(@2x) and iPhone 6 plus(3x).

<img src="https://i.stack.imgur.com/gSXxl.png" alt="enter image description here">

There is no option for iPhone 4 asset(probably apple is stopping iPhone 4 support) rather it takes @2x images (scale mode) for iPhone 4 also but you can do something like <a href="https://stackoverflow.com/questions/26604477/xcode-6-asset-catalog-iphone-6#answer-28457343">This post</a> for iPhone 4

Update Xcode 7

There is no option for separate image with Images.xcassets now in Xcode 7, We have to use same 2x images for all Retina devices and 3x for Retina HD device

blocks|key|4559198|text|如果你想在不同的设备上显式地做不同的事情，你现在需要用代码来做，比如Valar+Morghulis+said。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4559199|NSNumber+*screenWidth+=+@([UIScreen+mainScreen].bounds.size.width);
NSString+*imageName+=+[NSString+stringWithFormat:@"image-%25@",+screenWidth];
UIImage+*image+=+[UIImage+imageNamed:imageName];|code-block|syntax|javascript|4559200|或者，您可以使用UIDevice类来获取该信息。它有几个带有布尔返回值的方法，您可以使用它们来获取有关设备的各种信息：|4559201|[[UIDevice+currentDevice]+platform]
[[UIDevice+currentDevice]+hasRetinaDisplay]
[[UIDevice+currentDevice]+hasMultitasking]|4559202|或者，您可以包含<sys/sysctl.h>和；|style|CODE|4559203|NSString+*platform+=+[self+platform];

if+([platform+isEqualToString:@"iPhone3,1"])++++return+@"iPhone+4";
if+([platform+isEqualToString:@"iPhone3,3"])++++return+@"Verizon+iPhone+4";
if+([platform+isEqualToString:@"iPhone4,1"])++++return+@"iPhone+4S";
if+([platform+isEqualToString:@"iPhone5,1"])++++return+@"iPhone+5+(GSM)";
if+([platform+isEqualToString:@"iPhone5,2"])++++return+@"iPhone+5+(GSM%2BCDMA)";|4559204|以此类推。您可以在here上了解设备字符串。|4559205|还有一些其他的编程方法，但到目前为止，据我所知，在接口构建器中还没有明确的方法来做到这一点。请随时指出我的错误。|4559206|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/26860257/4674348|1|https://www.theiphonewiki.com/wiki/Models^0|Y|K|0|0|0|0|0|8|E|0|0|9|4|1|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|1C|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|1D|8|@$A|1E|B|1F|O|P]]|9|@]|C|$]]|$1|Q|3|R|5|F|7|1G|8|@]|9|@]|C|$G|H]]|$1|S|3|T|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|U|3|V|5|6|7|1L|8|@]|9|@]|C|$]]|$1|W|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]]|X|$Y|$5|Z|10|11|C|$12|13]]|14|$5|Z|10|11|C|$12|15]]]]

If you want to explicitly do different stuff on different devices, you need to do it in code for now, like <a href="https://stackoverflow.com/a/26860257/4674348">Valar Morghulis said</a>. 

<pre><code>NSNumber *screenWidth = @([UIScreen mainScreen].bounds.size.width);
NSString *imageName = [NSString stringWithFormat:@"image-%@", screenWidth];
UIImage *image = [UIImage imageNamed:imageName];
</code></pre>

OR, you can use UIDevice class to get that information. It has several methods with boolean returns you can use to get various information about the device:

<pre><code>[[UIDevice currentDevice] platform]
[[UIDevice currentDevice] hasRetinaDisplay]
[[UIDevice currentDevice] hasMultitasking]
</code></pre>

OR, you can include <code>&lt;sys/sysctl.h&gt;</code> and;

<pre><code>NSString *platform = [self platform];

if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,3"]) return @"Verizon iPhone 4";
if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5 (GSM)";
if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5 (GSM+CDMA)";
</code></pre>

so on and so forth. You can learn about device strings at <a href="https://www.theiphonewiki.com/wiki/Models" rel="nofollow noreferrer">here</a>.

There are some other ways to do this programmatically, But as of now, there is no explicit way to do this in the interface builder that I know of. Feel free to point out my mistakes.

I want to specify different background images for iPhone each device. Like this

<pre><code>iPhone 6 Plus 1242x2208 pixels bg@3x.png
iPhone 6 750x1334 pixels bg@2x.png
iPhone 5 640x1136 pixels bg@2x.png
iPhone 4 640x960 pixels bg@2x.png
iPhone 3GS 320x480 pixels bg.png
</code></pre>

In <code>LaunchImage</code> there is option available to specify images for <code>Retina HD 4.7</code> device. So no problem for Launch Images.

<img src="https://i.stack.imgur.com/UzL3L.png" alt="enter image description here">

In <code>.xcassets</code> file, I have option for <code>1x</code>, <code>2x</code>, <code>Retina 4 2x</code> and <code>3x</code>. But there is no option for <code>iPhone 6 (1334x750)</code> device.

<img src="https://i.stack.imgur.com/x0xrF.png" alt="enter image description here">

So how to provide <code>1334x750 px</code> image for iPhone 6 device? Looking for some solution using <code>.xcassets</code> file, not by programmatically loading images for each device.

I have already visited the related SO's questions, but none of them answers specifically for iPhone 6 device images.

<a href="https://stackoverflow.com/q/25755443/1444321">iPhone 6 Plus resolution confusion: Xcode or Apple&#39;s website? for development</a>

<a href="https://stackoverflow.com/q/26604477/1444321">xcode 6 asset catalog iphone 6</a>

Xcode 6 how to set separate @2x images for iPhone 5 and 6 devices?

Xcode

我想为每个设备指定不同的iPhone背景图像。像这样iPhone 6 Plus   1242x2208 pixels    bg@3x.pngiPhone 6        750x1334  pixels    bg@2x.pngiPhone 5        640x1136  pixels    bg@2x.pn...

问Xcode6如何为iPhone 5和6设备设置单独的@2x图像？
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