今天和大家一起分享下如何獲取當前IOS裝置的CPU型號，CPU核數，GPU，GPU核數，螢幕解析度，螢幕尺寸，PPI等資訊。相信各位發現通過蘋果官方開放的API想要獲取當前裝置以上的一些資訊似乎做不到。如今蘋果的硬體更新速度相當的快，還要在網上發現有有心人收集了所有已釋出蘋果裝置的相關裝置資訊，且不定期回去更新。詳情請見：Blake’s iOS Device Specifications Grid

筆者比較懶，於是就借用這位有心人的裝置資訊來幫助我們獲取iOS的以上的裝置資訊。下面我們就來看看程式碼。

首先我們為NSString新增一個Category，NSString+StringRegular。

//
//  NSString+StringRegular.h
//  HardwareInfo
//
//  Created by pcjbird on 15/5/27.
//  Copyright (c) 2015年 Zero Status. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString (StringRegular)

-(NSMutableArray *)substringByRegular:(NSString *)regular;

@end

//
//  NSString+StringRegular.m
//  HardwareInfo
//
//  Created by pcjbird on 15/5/27.
//  Copyright (c) 2015年 Zero Status. All rights reserved.
//
 


#import "NSString+StringRegular.h"

@implementation NSString (StringRegular)

-(NSMutableArray *)substringByRegular:(NSString *)regular{
    
    NSString * reg=regular;
    
    NSRange r= [self rangeOfString:reg options:NSRegularExpressionSearch];
    
    NSMutableArray *arr=[NSMutableArray array];
    
    if (r.length != NSNotFound &&r.length != 0) {
        
        while (r.length != NSNotFound &&r.length != 0) {
            NSString* substr = [self substringWithRange:r];
            [arr addObject:substr];
            NSRange startr=NSMakeRange(r.location+r.length, [self length]-r.location-r.length);
            r=[self rangeOfString:reg options:NSRegularExpressionSearch range:startr];
        }
    }
    return arr;
}

@end

接下來，我們來實現iOSHardwareInfoDataBase。

//
//  iOSHardwareInfoDataBase.h
//  HardwareInfo
//
//  Created by pcjbird on 15/5/27.
//  Copyright (c) 2015年 Zero Status. All rights reserved.
//

#import <Foundation/Foundation.h>

/*********************************
 Device,
 Model ID,
 Year,
 SoC,
 RAM (MB),
 Mem Speed (MHz),
 Mem Type,
 CPU,
 CPU Arch,
 Data Width,
 CPU Cores,
 CPU Clock (MHz),
 Geekbench Score,
 GPU,
 GPU Cores,
 GPU Clock (MHz),
 Screen Res,
 PPI,
 Screen Size (inches)
 *********************************/

@interface iOSHardwareInfoDataBase : NSObject

+ (iOSHardwareInfoDataBase *) sharedInstance;
@property(nonatomic, readonly) BOOL isReady;

-(NSDictionary *)currentDeviceInfo;
@end

//
// iOSHardwareInfoDataBase.m
// HardwareInfo
//
// Created by pcjbird on 15/5/27.
// Copyright (c) 2015年 Zero Status. All rights reserved.
//

#import "iOSHardwareInfoDataBase.h"
#import "NSString+StringRegular.h"
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>

#define IOS_DEVICE_SPECIFICATIONS_GRID_URL @"http://www.blakespot.com/ios_device_specifications_grid.html"

@interface iOSHardwareInfoDataBase()
{
    BOOL _isReady;
}
@property(nonatomic, strong) NSMutableDictionary* db;
@end

@implementation iOSHardwareInfoDataBase

@synthesize isReady = _isReady;

+ (iOSHardwareInfoDataBase *) sharedInstance
{
    static iOSHardwareInfoDataBase* _sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        if (!_sharedInstance) {
            if (!_sharedInstance) _sharedInstance=[[iOSHardwareInfoDataBase alloc] init];
        }
    });
    return _sharedInstance;
}

-(id)init
{
    if (self =[super init]) {
        _isReady = FALSE;
        self.db = [NSMutableDictionary dictionary];
        dispatch_async(dispatch_get_global_queue(0, 0), ^(void){
            [self TryParse];
        });
    }
    return self;
}

-(NSString *)getMetaData
{
    NSURL *url = [NSURL URLWithString:IOS_DEVICE_SPECIFICATIONS_GRID_URL];
    NSData *data = [NSData dataWithContentsOfURL:url];
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

-(void) TryParse
{
    NSFileManager*fileManager =[NSFileManager defaultManager];
    NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString*documentsDirectory =[paths objectAtIndex:0];
    NSString*path =[documentsDirectory stringByAppendingPathComponent:@"hardware"];
    if([fileManager fileExistsAtPath:path])
    {
        NSData *jsonData = [[NSFileManager defaultManager] contentsAtPath:path];
        NSDictionary * db= [jsonData toJSONObject];
        [self.db addEntriesFromDictionary:db];
    }
    NSString *metaData = [self getMetaData];
    if (!metaData)
    {
        _isReady = TRUE;
        return;
    }
    NSRange rangeTable= [metaData rangeOfString:@"<table border=0 cellpadding=0 cellspacing=2>[\\s\\S]*</table>" options:NSRegularExpressionSearch];
    if (rangeTable.length <=0)
    {
        _isReady = TRUE;
        return;
    }
    [self.db removeAllObjects];
    NSString* tableStr = [[metaData substringWithRange:rangeTable] stringByReplacingOccurrencesOfString:@" " withString:@""];
    tableStr = [tableStr stringByReplacingOccurrencesOfString:@"<br>" withString:@" "];
    tableStr = [tableStr stringByReplacingOccurrencesOfString:@"# " withString:@""];
    
    NSMutableArray *infoArray=[tableStr substringByRegular:@"<tr[\\s\\S]*?>[\\s\\S]*?</tr>"];

    NSString *titleStr = [infoArray firstObject];
    NSMutableArray *titleArr = [titleStr substringByRegular:@"<td[\\s\\S]*?>[\\s\\S]*?</td>"];
    
    for (NSUInteger i = 0; i < [titleArr count]; i++)
    {
        NSString *title = [titleArr objectAtIndex:i];
        NSRange rangetd = [title rangeOfString:@"<td[\\s\\S]*?>" options:NSRegularExpressionSearch];
        title = [title stringByReplacingCharactersInRange:rangetd withString:@""];
        title = [title stringByReplacingOccurrencesOfString:@"</td>" withString:@" "];
        [titleArr replaceObjectAtIndex:i withObject:title];
    }
    
    [infoArray removeObjectAtIndex:0];
    [infoArray removeLastObject];
    
    for (NSString *deviceInfo in infoArray)
    {
        NSMutableArray *devices = [deviceInfo substringByRegular:@"<td[\\s\\S]*?>[\\s\\S]*?</td>"];
        
        for (NSUInteger i = 0; i < [devices count]; i++)         
        {
             NSString *val = [devices objectAtIndex:i];
             NSRange rangetd = [val rangeOfString:@"<td[\\s\\S]*?>" options:NSRegularExpressionSearch]; 
            val = [val stringByReplacingCharactersInRange:rangetd withString:@""];
             val = [val stringByReplacingOccurrencesOfString:@"</td>" withString:@" "]; 
            [devices replaceObjectAtIndex:i withObject:val];
         } 
        NSString *deviceKey = [devices objectAtIndex:1];
        NSArray* keyArr = [[deviceKey stringByReplacingOccurrencesOfString:@" " withString:@""] componentsSeparatedByString:@"•"];
         NSRange chRange = [[keyArr firstObject] rangeOfString:@"[\\D]*" options:NSRegularExpressionSearch]; 
        NSString* chs = [[keyArr firstObject] substringWithRange:chRange]; 
        for (NSString* _key in keyArr)
         { 
            if (_key && [_key length] > 0)
            {
                NSMutableDictionary *dict = [NSMutableDictionary dictionary];
                for (NSUInteger j = 0; j < [titleArr count]; j++)
                {
                    if (j != 1)
                    {
                        NSString *titleKey = [[titleArr objectAtIndex:j] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
                        NSString *deviceVal = [[devices objectAtIndex:j]stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];;
                        [dict setObject:deviceVal forKey:titleKey];
                    }
                }
                NSString* dKey = _key;
                if ([dKey rangeOfString:chs].length == 0) dKey = [chs stringByAppendingString:dKey];
                [self.db setObject:dict forKey:dKey];
            }
        }
    }
    _isReady = TRUE;
    NSData *newJsonData = [DataParseUtil toJSONData:self.db];
    [newJsonData writeToFile:path atomically:YES];
}

- (NSString *) platform{
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    free(machine);
    return platform;
}

-(NSDictionary *)currentDeviceInfo
{
    if (_isReady)
    {
        return [self.db objectForKey:[self platform]];
    }
    return nil;
}
@end

最後我們來寫下測試部分的程式碼。

   //在程式啟動時呼叫以下程式碼
   [iOSHardwareInfoDataBase sharedInstance];

   //在需要獲取裝置資訊的地方呼叫以下程式碼
   NSLog(@"current device info: %@", [[iOSHardwareInfoDataBase sharedInstance] currentDeviceInfo]);

希望這段分享對您有所幫助。