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NSString *STR = @”THIS IS. A PIG”;
NSRange range = [STR rangeOfString:@”.”];
NSString *str = [STR substringToIndex:range.location];

NSString *houmian = [STR substringFromIndex:range.location];
NSLog(@”%@”,str);//
NSLog(@”%@”,houmian);
2016-05-27 10:02:42.053 cellModel[2064:39080] THIS IS
2016-05-27 10:02:42.054 cellModel[2064:39080] A PIG