iOS区分各种设备

if([ [ UIDevice currentDevice ] userInterfaceIdiom ] == UIUserInterfaceIdiomPhone ){ 
//IPhone设备 
}else{ 
//ipad设备 

} 

+ (NSString*)deviceString 
{ 
// 需要#import "sys/utsname.h" 
struct utsname systemInfo; 
uname(&systemInfo); 
NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding]; 
if ([deviceString isEqualToString:@"iPhone1,1"]) return @"iPhone 1G"; 
if ([deviceString isEqualToString:@"iPhone1,2"]) return @"iPhone 3G"; 
if ([deviceString isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS"; 
if ([deviceString isEqualToString:@"iPhone3,1"]) return @"iPhone 4"; 
if ([deviceString isEqualToString:@"iPhone4,1"]) return @"iPhone 4S"; 
if ([deviceString isEqualToString:@"iPhone5,2"]) return @"iPhone 5"; 
if ([deviceString isEqualToString:@"iPhone3,2"]) return @"Verizon iPhone 4"; 
if ([deviceString isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G"; 
if ([deviceString isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G"; 
if ([deviceString isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G"; 
if ([deviceString isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G"; 
if ([deviceString isEqualToString:@"iPad1,1"]) return @"iPad"; 
if ([deviceString isEqualToString:@"iPad2,1"]) return @"iPad 2 (WiFi)"; 
if ([deviceString isEqualToString:@"iPad2,2"]) return @"iPad 2 (GSM)"; 
if ([deviceString isEqualToString:@"iPad2,3"]) return @"iPad 2 (CDMA)"; 
if ([deviceString isEqualToString:@"i386"]) return @"Simulator"; 
if ([deviceString isEqualToString:@"x86_64"]) return @"Simulator"; 
NSLog(@"NOTE: Unknown device type: %@", deviceString); 
return deviceString; 
}