iOS ... NS_REQUIRES_NIL_TERMINATION

標籤：uialertview

看到官方的一個例子不錯，這裡留記。

#import <Cocoa/Cocoa.h>@interface NSMutableArray (variadicMethodExample)- (void) appendObjects:(id) firstObject, ...; // This method takes a nil-terminated list of objects.@end@implementation NSMutableArray (variadicMethodExample)- (void) appendObjects:(id) firstObject, ...{id eachObject;va_list argumentList;if (firstObject) // The first argument isn't part of the varargs list,  {                                   // so we'll handle it separately.  [self addObject: firstObject];  va_start(argumentList, firstObject); // Start scanning for arguments after firstObject.  while (eachObject = va_arg(argumentList, id)) // As many times as we can get an argument of type "id"      [self addObject: eachObject]; // that isn't nil, add it to self's contents.  va_end(argumentList);  }}@end

地址：https://developer.apple.com/library/mac/qa/qa1405/_index.html

最經常見到的應該是UIAlertView裡用的了。

- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id /*<UIAlertViewDelegate>*/)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles, ... NS_REQUIRES_NIL_TERMINATION;

iOS ... NS_REQUIRES_NIL_TERMINATION