iOS ... NS_REQUIRES_NIL_TERMINATION

iOS ... NS_REQUIRES_NIL_TERMINATION

看到官方的一個例子不錯，這裡留記。

 

#import @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 

 

最經常見到的應該是UIAlertView裡用的了。

 

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