我们现在需要考虑iPhone 6和6Plus的屏幕尺寸。以下是最新的答案

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
    //its iPhone. Find out which one?

    CGSize result = [[UIScreen mainScreen] bounds].size;
    if(result.height == 480)
    {
        // iPhone Classic
    }
    else if(result.height == 568)
    {
        // iPhone 5
    }
    else if(result.height == 667)
    {
        // iPhone 6
    }
   else if(result.height == 736)
    {
        // iPhone 6 Plus
    }
}
else
{
     //its iPad
}

一些有用的信息

iPhone 6 Plus   736x414 points  2208x1242 pixels    3x scale    1920x1080 physical pixels   401 physical ppi    5.5"
iPhone 6        667x375 points  1334x750 pixels     2x scale    1334x750 physical pixels    326 physical ppi    4.7"
iPhone 5        568x320 points  1136x640 pixels     2x scale    1136x640 physical pixels    326 physical ppi    4.0"
iPhone 4        480x320 points  960x640 pixels      2x scale    960x640 physical pixels     326 physical ppi    3.5"
iPhone 3GS      480x320 points  480x320 pixels      1x scale    480x320 physical pixels     163 physical ppi    3.5"

非常简单的解决方法

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
    CGSize result = [[UIScreen mainScreen] bounds].size;
    if(result.height == 480)
    {
        // iPhone Classic
    }
    if(result.height == 568)
    {
        // iPhone 5
    }
}

通过这种方式，您可以检测设备系列。

    #import <sys/utsname.h>
    NSString* deviceName()
    {
        struct utsname systemInformation;
        uname(&systemInformation);
        NSString *result = [NSString stringWithCString:systemInformation.machine
                                              encoding:NSUTF8StringEncoding];
        return result;
    }

    #define isIPhone5  [deviceName() rangeOfString:@"iPhone5,"].location != NSNotFound
    #define isIPhone5S [deviceName() rangeOfString:@"iPhone6,"].location != NSNotFound

Add a 'New Swift File'-> AppDelegateEx.swift add an extension to AppDelegate import UIKit extension AppDelegate { class func isIPhone5 () -> Bool{ return max(UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height) == 568.0 } class func isIPhone6 () -> Bool { return max(UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height) == 667.0 } class func isIPhone6Plus () -> Bool { return max(UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height) == 736.0 } } usage: if AppDelegate.isIPhone5() { collectionViewTopConstraint.constant = 2 }else if AppDelegate.isIPhone6() { collectionViewTopConstraint.constant = 20 }

依赖规模在很多层面上都是错误的。如果我们问系统呢?

- (NSString *) getDeviceModel
{
    struct utsname systemInfo;
    uname(&systemInfo);
    return [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
}

摘自《检测硬件类型的最佳方法，iPhone4还是iPhone5?》edzio27回答。

我冒昧地将Macmade的宏放入一个C函数中，并正确地命名它，因为它可以检测宽屏可用性，而不一定是iPhone 5。

如果项目不包含Default-568h@2x.png，宏也不会检测到在iPhone 5上运行。如果没有新的默认图像，iPhone 5将显示常规的480x320屏幕大小(以点数计算)。因此，检查不仅仅是宽屏可用性，而是宽屏模式是否启用。

BOOL isWidescreenEnabled()
{
    return (BOOL)(fabs((double)[UIScreen mainScreen].bounds.size.height - 
                                               (double)568) < DBL_EPSILON);
}