## iOS 处理方法中的可变參数

      近期写了一个自己定义的对话框的demo，想模仿系统的UIAlertView的实现方式。对处理可变參数的时候，遇到了小问题，于是谷歌了一下。写下了处理问题的方法。记录下来，以备后需。

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代码实现

- (instancetype)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ... {    if (self = [super init]) {        self.title = title;        self.delegate = delegate;        self.frame = CYScreen.bounds;        // 获取可变參数的值        if (![self isBlankString:cancelButtonTitle]) {            [self.buttonTitles addObject:cancelButtonTitle];        }        NSString *str;        va_list list;        if(otherButtonTitles)        {            // 1.取得第一个參数的值            CYLog(@"%@", otherButtonTitles);            [self.buttonTitles addObject:otherButtonTitles];            // 2.从第2个參数開始。依此取得全部參数的值            va_start(list, otherButtonTitles);            while ((str = va_arg(list, NSString *))){                CYLog(@"%@", str);                [self.buttonTitles addObject:str];            }            va_end(list);        }        CYLog(@"%@", self.buttonTitles);    }    return self;}

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方法调用

- (IBAction)showDialog {    CYAlertView *alert = [[CYAlertView alloc]initWithTitle:@"我的提示" message:@"消息正文" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", @"XXX", @"YYY", nil];    alert.containerView = [self createDemoView];    [alert show];}

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打印结果

2015-07-06 15:54:26.422 CYCustomAlertView[358:42937] 确定2015-07-06 15:54:26.424 CYCustomAlertView[358:42937] XXX2015-07-06 15:54:26.424 CYCustomAlertView[358:42937] YYY2015-07-06 15:54:26.425 CYCustomAlertView[358:42937] (    取消,    确定,    XXX,    YYY,)