检查数组是否不包含某个对象

发布于 2024-09-15 13:38:36 字数 117 浏览 1 评论 0原文

是否有一个类可用于检查数组是否不包含对象？我想做一些类似的事情

if [(myarray doesntContain @"object")]

这可能吗

原文

is there a class available to check if an array doesn't contain an object?
I want to do something like

if [(myarray doesntContain @"object")]

is this possible

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眼波传意 2024-09-22 13:38:36

对于 NSArray 使用 -containsObject::

if (![myarray containsObject:someObject]) {
    // ...
}

For NSArray use -containsObject::

if (![myarray containsObject:someObject]) {
    // ...
}

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日暮斜阳 2024-09-22 13:38:36

我编写了一个 NSArray 类别来通过实例方法实现这些否定检查，正如您最初所要求的那样。第一个用于数组类型的对象集组，后者用于单个检查。如果数组实例不包含传递的一个或多个对象，则返回 YES。为什么？感叹号让我困惑。

NSArray+Additions.h

-(BOOL)doesNotContainObjects:(id)enumerable;

-(BOOL)doesNotContainObject:(id)object; >

NSArray+Additions.m

-(BOOL)doesNotContainObjects:(id<NSFastEnumeration>)enumerable {
   for (id x in enumerable) {
     if ([self containsObject:x]) return NO; // exists, abort!
   }
   return YES;   // it ain't in there, return TRUE;
}
- (BOOL)doesNotContainObject:(id)object {
  if ([self containsObject:object]) return NO; return YES;
}

I wrote an NSArray category to achieve these negated checks via instance methods, as you had originally requested.. The first is for an array-type set group of objects, the latter for a singular check. These return YES in the case that the array instance DOES NOT contain the passed object or objects. Why? Exclamation marks confuse me.

NSArray+Additions.h

-(BOOL)doesNotContainObjects:(id<NSFastEnumeration>)enumerable;

-(BOOL)doesNotContainObject:(id)object;

NSArray+Additions.m

-(BOOL)doesNotContainObjects:(id<NSFastEnumeration>)enumerable {
   for (id x in enumerable) {
     if ([self containsObject:x]) return NO; // exists, abort!
   }
   return YES;   // it ain't in there, return TRUE;
}
- (BOOL)doesNotContainObject:(id)object {
  if ([self containsObject:object]) return NO; return YES;
}

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