ios - 即使在 iPhone 5 上运行 IS IPHONE_5 也会返回 0

Question

我已经使用此代码来检测设备是否为 iPhone 5 以设置适当的 UI。

( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )

但是，即使应用程序在 iPhone 5c 中运行，它也会返回 0。
我也提到了 How to detect iPhone 5 (widescreen devices)?但更新的代码仍然不起作用。请帮忙。

Answer 1

嗯，一开始你也确实把 iPhone5S 认成了 iPhone 5，这不一样。
我宁愿使用设备名称，因为您的宏可以随心所欲地扩展。

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

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

设备列表在这里:

/*
 @"i386"      on the simulator
 @"iPod1,1"   on iPod Touch
 @"iPod2,1"   on iPod Touch Second Generation
 @"iPod3,1"   on iPod Touch Third Generation
 @"iPod4,1"   on iPod Touch Fourth Generation
 @"iPod5,1"   on iPod Touch Fifth Generation
 @"iPhone1,1" on iPhone
 @"iPhone1,2" on iPhone 3G
 @"iPhone2,1" on iPhone 3GS
 @"iPad1,1"   on iPad
 @"iPad2,1"   on iPad 2
 @"iPad3,1"   on 3rd Generation iPad
 @"iPad3,2":  on iPad 3(GSM+CDMA)
 @"iPad3,3":  on iPad 3(GSM)
 @"iPad3,4":  on iPad 4(WiFi)
 @"iPad3,5":  on iPad 4(GSM)
 @"iPad3,6":  on iPad 4(GSM+CDMA)
 @"iPhone3,1" on iPhone 4
 @"iPhone4,1" on iPhone 4S
 @"iPhone5,1" on iPhone 5
 @"iPad3,4"   on 4th Generation iPad
 @"iPad2,5"   on iPad Mini
 @"iPhone5,1" on iPhone 5(GSM)
 @"iPhone5,2" on iPhone 5(GSM+CDMA)
 @"iPhone5,3  on iPhone 5c(GSM)
 @"iPhone5,4" on iPhone 5c(GSM+CDMA)
 @"iPhone6,1" on iPhone 5s(GSM)
 @"iPhone6,2" on iPhone 5s(GSM+CDMA)
 */

我的方法与这里的帖子有关，但可以在前缀标题中轻松使用:
Detect if the device is iPhone 5s

为确保您可以在每个文件中使用此宏，请执行以下步骤:
创建一个新文件(让我们称之为“Helperfunctions”)

.h 文件包含函数的定义，仅此而已:

NSString* deviceName();

.m 文件包含给定的设备名称代码:

#import "Helperfunctions.h"
#import <sys/utsname.h>

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

在预编译的头文件中，您现在可以添加代码(或添加到另一个文件，您已经在 .pch 中导入，所以它看起来像:

//
//  Prefix header
//
//  The contents of this file are implicitly included at the beginning of every source file.
//

#import <Availability.h>

#ifndef __IPHONE_5_0
#warning "This project uses features only available in iOS SDK 5.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>

    #import "Helperfunctions.h"

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