According to me the best way of dealing with such problems and avoiding couple of condition required for checking the the height of device, is using the relative frame for views or any UI element which you are adding to you view for example: if you are adding some UI element which you want should at the bottom of view or just above tab bar then you should take the y origin with respect to your view's height or with respect to tab bar (if present) and we have auto resizing property as well. I hope this will work for you

我添加了新的默认启动图像，(在检查其他几个SE答案…)确保我的故事板都自动大小和子视图，但视网膜4英寸仍然是信箱。

然后我注意到我的信息plist有一个行项目“启动图像”设置为“Default.png”，因此我删除了它，神奇的字母盒不再出现。希望这能让别人免受我所经历的疯狂。

Download and install latest version of Xcode. Set a Launch Screen File for your app (in the general tab of your target settings). This is how you get to use the full size of any screen, including iPad split view sizes in iOS 9. Test your app, and hopefully do nothing else, since everything should work magically if you had set auto resizing masks properly, or used Auto Layout. If you didn't, adjust your view layouts, preferably with Auto Layout. If there is something you have to do for the larger screens specifically, then it looks like you have to check height of [[UIScreen mainScreen] bounds] as there seems to be no specific API for that. As of iOS 8 there are also size classes that abstract screen sizes into regular or compact vertically and horizontally and are recommended way to adapt your UI.

有时候(对于预storyboard应用程序)，如果布局会有足够的不同，在viewController init中根据设备指定不同的xib是值得的(参见这个问题-你需要修改代码来处理iPhone 5)，因为如果你需要不同的图形，再多的自动调整蒙版也不会起作用。

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

    NSString *myNibName;
    if ([MyDeviceInfoUtility isiPhone5]) myNibName = @"MyNibIP5";
    else myNibName = @"MyNib";

    if ((self = [super initWithNibName:myNibName bundle:nibBundleOrNil])) {


...

这对于针对旧iOS版本的应用程序非常有用。

首先显示这张图片。在那个图像中，你显示了视网膜4支持的警告，所以点击这个警告，然后点击添加，这样你的视网膜4启动屏幕自动添加到你的项目中。

在你使用这段代码之后

if([[UIScreen mainScreen] bounds].size.height == 568)
    {
        // For iphone 5
    }
    else
    {
        // For iphone 4 or less
    }

在constants.h文件中，你可以添加以下定义语句:

 #define IS_IPAD UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad 
 #define IS_IPHONE UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone
 #define IS_WIDESCREEN (fabs((double)[[UIScreen mainScreen] bounds].size.height - (double)568) < DBL_EPSILON) 
 #define IS_IPHONE_5 (!IS_IPAD && IS_WIDESCREEN)