objective-c string使用switch的一种方法

NSString * statusString     = @"someString"
        NSArray *status=@[@"critical",@"warning",@"clear"];
        int item=[status indexOfObject:statusString];
        switch (item) {
            case 0:
                balabala;
                break;
            case 1:
                balabala;
                break;
            case 2:
                balabala;
                break;
            default:
                break;
        }