在iPhone5和iPhone4的xib中处理不同尺寸的图像？

问题描述

之前关于迁移到iPhone 5的帖子只提到添加新尺寸的启动图像*
，如果需要，可以使用AutoLayout。

The previous posting on here about migrating to iPhone 5 only mention adding a new sized launch image*and maybe using AutoLayout if need be.

但是我有几个xibs，其中有一个背景图像填满了整个屏幕（可能是导航和标签栏，取决于视图）。为了支持iPhone 5，我现在需要针对不同屏幕尺寸的不同图像，如何在xib或其他地方处理？

But I have a few xibs where there is a background image which fills up the whole of the screen (maybe minue the navigation and tab bar, depending upon the view). To support iPhone 5 I will now need different images for the different screen size, how is this dealt with in the xib or elsewhere?

（顺便说一下，如果该应用程序不使用启动图像？）

(*incidentally what do you do if the app doesn't use a launch image?)

推荐答案

将使您的工作变得轻松。

Here's a link that will actually help you. Save the launch image, iOS doesn't automatically pick the right image if you put in a "[email protected]" at the end of the file name. There are a couple of helper methods mentioned in the above link that will make your job easy.

我已采用上面提到的链接中的代码，这里是Obj-C的辅助函数：

I have adopted the code in the links I mentioned above and here's the helper function for Obj-C:

-(BOOL) IsTall
{
    return ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) && ([[UIScreen mainScreen] bounds].size.height * [[UIScreen mainScreen] scale] >= 1136);
}

一点点类别写作也会有所帮助。

A little category-writing would help too.

@interface NSString (Special)
-(NSString*)correctImageNameForiPhone5
@end

@implementation NSString (Special)
-(NSString*)correctImageNameForiPhone5
{
    if([self isTall])
            return [email protected]_-; //Do the correct NSString magic here
    else
            return -originalImageName-;
}
@end

最后，当您访问UIImage对象时：

Finally, when you are accessing the UIImage object:

NSString *filename = @"backgroundImage.png";
UIImage *img = [UIImage imageNamed:[filename correctImageNameForiPhone5]];

这里的假设是你所有的iPhone5特定图像文件名都以-568h结尾@ 2X。如果你把它放到你的项目中，这个代码示例绝对不会起作用，但你明白了。它需要一些NSString修复。

The assumption here is that you would have all your iPhone5-specific image file names ending with "-568h@2x". This code sample is definitely not gonna work if you just drop it into your project, but you get the idea. It needs some NSString fixes.

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