iPhone/iPad/iPod touch编程时版本区分

写程序时，可能需要对应各种不同的iPhone iOS的不同，型号的不同，区分代码如下：

可以从 UIDevice 的属性 model 得到在现在执行的环境。例子如下：

NSString *modelname = [[UIDevice currentDevice]model];
if ([modelname isEqualToString:@"iPhone"]) {
// iPhone
}
if ([modelname isEqualToString:@"IPod Touch"]) {
// iPod touch
}
if ([modelname isEqualToString:@"iPhone Simulator"]) {
// iPhone Simulator
}

也可以通过宏定义区分

#if TARGET_OS_IPHONE
// iPhone Device
#endif

#if TARGET_IPHONE_SIMULATOR
// iPhone Simulator
#endif

#if !TARGET_IPHONE_SIMULATOR
// iPhone Device
#endif

ios设备版本的区分-iphone3gs,iphone4....
ios提供了几种c函数来获得相应信息如下

struct utsname u;
uname(&u); ///-----get device struct info
NSString *machine = [NSString stringWithCString:u.machine];

if ([machine isEqualToString:@"iPhone1,1"]) {
// iPhone 1G
}
if ([machine isEqualToString:@"iPhone1,2"]) {
// iPhone 3G
}
if ([machine isEqualToString:@"iPhone2,1"]) {
// iPhone 3GS
}
if ([machine isEqualToString:@"iPod1,1"]) {
// iPod touch 1G
}
if ([machine isEqualToString:@"iPod2,1"]) {
// iPod touch 2G
}
if ([machine isEqualToString:@"iPod3,1"]) {
// iPod touch Late2009
}

或者

- (NSString *) platform
{
size_t size;
sysctlbyname("hw.machine", NULL, &size, NULL, 0);
char *machine = malloc(size);
sysctlbyname("hw.machine", machine, &size, NULL, 0);///-----get device struct info

/*
Possible values:
"iPhone1,1" = iPhone 1G
"iPhone1,2" = iPhone 3G
"iPhone2,1" = iPhone 3GS
"iPod1,1"   = iPod touch 1G
"iPod2,1"   = iPod touch 2G
*/
NSString *platform = [NSString stringWithCString:machine];

free(machine);
return platform;
}