identifierForVendor和iOS6
identifierForVendor需要iOS6，所以如果我的应用程序目前支持iOS4，所以我不能使用它，因为我的更新应该总是符合我的应用程序的前一分钟。 需求？
你可以使用这个：
NSString *udid; if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")) udid = [UIDevice currentDevice].identifierForVendor.UUIDString; else udid = [UIDevice currentDevice].uniqueIdentifier;
预处理器代码：
#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)
你不需要预处理器macros，你应该检查它是否响应，如下所示：
if ([[UIDevice currentDevice]respondsToSelector:@selector(identifierForVendor)]) { return [UIDevice currentDevice].identifierForVendor.UUIDString; }else{ // return [UIDevice currentDevice]. uniqueIdentifier return [[UIDevice currentDevice] performSelector:@selector(uniqueIdentifier)]; }
它总是不同的。 UUID包含时间戳，所以每次调用这个函数时，都会得到一个不同的（随机的）函数。 我在IDManager类中遵循了这种方法，这是从不同的解决scheme中收集的。 KeyChainUtil是从钥匙串中读取的包装器。 在github中find类似的keychain util。
// IDManager.m /* A replacement for deprecated uniqueIdentifier API. Apple restrict using this from 1st May, 2013. We have to consider, * iOS <6 have not the ASIIdentifer API * When the user upgrade from iOS < 6 to >6 - Check if there is a UUID already stored in keychain. Then use that. - In that case, this UUID is constant for whole device lifetime. Keychain item is not deleted with application deletion. */ #import "IDManager.h" #import "KeychainUtils.h" #import "CommonUtil.h" #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000 #import <AdSupport/AdSupport.h> #endif #include <sys/socket.h> #include <sys/sysctl.h> #include <net/if.h> #include <net/if_dl.h> /* Apple confirmed this bug in their system in response to a Technical Support Incident request. They said that identifierForVendor and advertisingIdentifier sometimes returning all zeros can be seen both in development builds and apps downloaded over the air from the App Store. They have no work around and can't say when the problem will be fixed. */ #define kBuggyASIID @"00000000-0000-0000-0000-000000000000" #pragma mark #pragma mark @implementation IDManager + (NSString *) getUniqueID { #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000 if (NSClassFromString(@"ASIdentifierManager")) { NSString * asiID = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString]; if ([asiID compare:kBuggyASIID] == NSOrderedSame) { NSLog(@"Error: This device return buggy advertisingIdentifier."); return [IDManager getUniqueUUID]; } else { return asiID; } } else { #endif return [IDManager getUniqueUUID]; #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000 } #endif } + (NSString *) getUniqueUUID { NSError * error; NSString * uuid = [KeychainUtils getPasswordForUsername:@"UserName" andServiceName:@"YourServiceName" error:&error]; if (error) { NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]); return nil; } if (!uuid) { DLog(@"No UUID found. Creating a new one."); uuid = [IDManager getUUID]; uuid = [CommonUtil md5String:uuid]; // create md5 hash for security reason [KeychainUtils storeUsername:@"UserName" andPassword:uuid forServiceName:@"YourServiceName" updateExisting:YES error:&error]; if (error) { NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]); return nil; } } return uuid; } + (NSString *) readUUIDFromKeyChain { NSError * error; NSString * uuid = [KeychainUtils getPasswordForUsername:@"UserName" andServiceName:@"YourServiceName" error:&error]; if (error) { NSLog(@"Error geting unique UUID for this device! %@", [error localizedDescription]); return nil; } return uuid; } /* NSUUID is after iOS 6. So we are using CFUUID for compatibility with iOS 4.3 */ + (NSString *)getUUID { CFUUIDRef theUUID = CFUUIDCreate(NULL); CFStringRef string = CFUUIDCreateString(NULL, theUUID); CFRelease(theUUID); return [(NSString *)string autorelease]; } #pragma mark - MAC address /* THIS WILL NOT WORK IN iOS 7. IT WILL RETURN A CONSTANT MAC ADDRESS ALL THE TIME. SEE - https://developer.apple.com/news/?id=8222013a */ // Return the local MAC address // Courtesy of FreeBSD hackers email list // Last fallback for unique identifier + (NSString *) getMACAddress { int mib[6]; size_t len; char *buf; unsigned char *ptr; struct if_msghdr *ifm; struct sockaddr_dl *sdl; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = AF_LINK; mib[4] = NET_RT_IFLIST; if ((mib[5] = if_nametoindex("en0")) == 0) { printf("Error: if_nametoindex error\n"); return NULL; } if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { printf("Error: sysctl, take 1\n"); return NULL; } if ((buf = malloc(len)) == NULL) { printf("Error: Memory allocation error\n"); return NULL; } if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { printf("Error: sysctl, take 2\n"); free(buf); // Thanks, Remy "Psy" Demerest return NULL; } ifm = (struct if_msghdr *)buf; sdl = (struct sockaddr_dl *)(ifm + 1); ptr = (unsigned char *)LLADDR(sdl); NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; free(buf); return outstring; } + (NSString *) getHashedMACAddress { NSString * mac = [IDManager getMACAddress]; return [CommonUtil md5String:mac]; } @end
您可以使用下面的代码
if (NSClassFromString(@"ASIdentifierManager")) { return [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString]; } else { // return other identifier generated with OpenUDID or some custom method }
您可以在这里获得OpenUDID文档
看看NSSelectorFromString和[NSObject performSelector：SEL]。 NSSelectorFromString允许你通过运行时用一个stringselect一个select器。 在运行时将其与OS版本检查结合使用。