iOS手机设备判断硬件信息

方法一：

-(void)defineDeviceType{
    extern int deviceType;
    NSRange rg= [[[UIDevice currentDevice].model lowercaseString]rangeOfString:@"iphone"];
    if(rg.location!=NSNotFound){
        deviceType=0;
        return;
    }
    rg= [[[UIDevice currentDevice].model lowercaseString]rangeOfString:@"ipad"];
    if(rg.location!=NSNotFound){
        deviceType=1;
        return;
    }
    rg= [[[UIDevice currentDevice].model lowercaseString]rangeOfString:@"ipod"];
    if(rg.location!=NSNotFound){
        deviceType=2;
        return;
    }
    deviceType=-1;
    //    NSLog(@"%@",[UIDevice currentDevice].model);//iPhone Simulator iPod touch
    //    NSLog(@"%@",[UIDevice currentDevice].name);//name you defined
    //      NSLog(@"%@",[UIDevice currentDevice].systemName);//iPhone OS
    //      NSLog(@"%@",[UIDevice currentDevice].systemVersion);//version of OS
    
    
}

这个比较全面的获得各种信息，还是不错的。

方法二：

- (NSString *) platform
{
	size_t size;
	
	// get the length of machine name
	sysctlbyname("hw.machine", NULL, &size, NULL, 0);
	
	// get machine name
	char *machine = malloc(size);
	sysctlbyname("hw.machine", machine, &size, NULL, 0);
	NSString *platform = [NSString stringWithCString:machine];
	free(machine);
	
	return platform;
}

能获得类似iPod4,1的信息，从而知道机器版本，但是没有办法获得ios版本

方法三：宏

#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

调用方法：

if (SYSTEM_VERSION_LESS_THAN(@“5.0”))
{ //viewWillAppear或didReceiveMemoryWarning或其他
}