NSString * strUUID = (NSString *)[SPIMyUUID load:@"KEY_USERNAME_PASSWORD"];
//首次执行该方法时,uuid为空
if ([strUUID isEqualToString:@""] || !strUUID)
{
//生成一个uuid的方法
CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);
strUUID = (NSString *)CFBridgingRelease(CFUUIDCreateString (kCFAllocatorDefault,uuidRef));
}
NSLog(@"%@",strUUID);
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