iOS 可变参函数的使用

 initWithTitle:@"提示" icon:nil message:@"当前您的推流状态异常，请点击推流按钮重新推流" delegate:nil buttonTitles:@"OK", @"关闭", @"开启", nil];

- (instancetype)initWithTitle:(NSString *)title icon:(UIImage *)icon message:(NSString *)message delegate:(id<***>)delegate buttonTitles:(NSString *)buttonTitles, ... {
    if (self = [super initWithFrame:[UIScreen mainScreen].bounds]) {
        _icon = icon;
        _title = title;
        _message = message;
        _delegate = delegate;
        _buttonArray = [NSMutableArray array];
        _buttonTitleArray = [NSMutableArray array];
        
        va_list args;
        va_start(args, buttonTitles);
        if (buttonTitles)
        {
            [_buttonTitleArray addObject:buttonTitles];
            while (1)
            {
                NSString *  otherButtonTitle = va_arg(args, NSString *);
                if(otherButtonTitle == nil) {
                    break;
                } else {
                    [_buttonTitleArray addObject:otherButtonTitle];
                }
            }
        }
        va_end(args);
        
        self.backgroundColor = [UIColor clearColor];
        
        _backgroundView = [[UIView alloc] initWithFrame:self.frame];
        _backgroundView.backgroundColor = [UIColor blackColor];
        [self addSubview:_backgroundView];
        [self initContentView];
    }
    return self;
}