NSArray

NSArray

用属性表显示一个数组的内容。

• (NSString *)descriptionWithLocale:(nullable id)locale;
• (NSString *)descriptionWithLocale:(nullable id)locale indent:(NSUInteger)level;
• (NSString *)description

正序倒序

• (NSEnumerator *)objectEnumerator;

• (NSEnumerator *)reverseObjectEnumerator;

  //1.原始数组
  NSMutableArray array = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",nil];
  //2.倒序的数组
  NSArray reversedArray = [[array reverseObjectEnumerator] allObjects];

//2、枚举器法
NSLog(@"------- 枚举器法---------");
//ObjectEnumerator        正序
//reverseObjectEnumerator 逆序
NSEnumerator *enumerator = [array reverseObjectEnumerator];
id obj = nil;  //不确定数组里面具体对象的类型，所以定义成id 类型指针
while (obj = [enumerator nextObject]) { //通过枚举器，取数组里面的每一个元素
    NSLog(@"%@", obj);                  //将元素赋给 obj， 直到数组结束
    //取到的结果为nil，退出while
}

用来数组排序的参数：

@property (readonly, copy) NSData *sortedArrayHint;

• (NSArray *)sortedArrayUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))comparator context:(nullable void *)context;

• (NSArray *)sortedArrayUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))comparator context:(nullable void *)context hint:(nullable NSData *)hint;

使用NSArray自己的sel方法来排序，如果自定义要创建NSArray的category

• (NSArray *)sortedArrayUsingSelector:(SEL)comparator;

是否已经把文件保存到辅助文件 或者 网上的URL中

• (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;

• (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomically;

将一个操作 作用在数组中的每个元素上.。（不带参数/带参数）

• (void)makeObjectsPerformSelector:(SEL)aSelector
• (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument;

返回指定下标的一个对象。

• (ObjectType)objectAtIndexedSubscript:(NSUInteger)idx NS_AVAILABLE(10_8, 6_0);

数组的遍历

• (void)enumerateObjectsUsingBlock:(void (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);

数组的遍历，新加遍历顺序

• (void)enumerateObjectsWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(id obj, NSUInteger idx,BOOL *stop))block

数组某一部分的遍历，新加遍历顺序

• (void)enumerateObjectsAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts usingBlock:(void (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))block NS_AVAILABLE(10_6, 4_0);

根据条件用来获取一个NSUIndex 对象，主要是根据条件进行数据遍历使用

• (NSUInteger)indexOfObjectPassingTest:(BOOL (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

NSInteger index = [array indexOfObjectPassingTest:^ BOOL (id tr,NSUInteger index, BOOL *te){
NSString *s = (NSString *)tr;
if([@"wendy" isEqualToString:s])
{
return YES;
}
return NO;
}];

NSLog(@"index==%d=.",index);

选择数组的遍历顺序，来获取一个NSUindex对象

• (NSUInteger)indexOfObjectWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

子数组 遍历 处理数据

• (NSUInteger)indexOfObjectAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts passingTest:(BOOL (NS_NOESCAPE^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

根据block 的处理获取一个NSIndexSet 对象。 顺序。子数组

• (NSIndexSet *)indexesOfObjectsPassingTest:(BOOL (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

• (NSIndexSet *)indexesOfObjectsWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

• (NSIndexSet *)indexesOfObjectsAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts passingTest:(BOOL (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate NS_AVAILABLE(10_6, 4_0);

  NSIndexSet *index = [array indexesOfObjectsWithOptions:NSEnumerationReverse passingTest: ^ BOOL (id tr, NSUInteger index,BOOL *te){

    NSString *s = (NSString *)tr;
    if([s isEqualToString:@"andy"]){
        return YES;
    }
    return NO;
  

  }];

  NSLog(@"%@",index);

对数组进行排序操作 参数cmptr 是一个block 函数块，返回的数据类型是一个NSComparisonResult 对象

• (NSArray *)sortedArrayUsingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);

NSArray *te = [array sortedArrayUsingComparator:^ NSComparisonResult (NSString *s,NSString *s2){
if(s.length < s2.length){
return NSOrderedAscending;
}
if(s.length > s2.length){
return NSOrderedDescending;
}

   return NSOrderedSame;
}];

NSLog(@"te=%@.",te);

进行排序操作，NSSortOptions 排序的参数 用来表示是同时排序，还是稳定执行。

• (NSArray *)sortedArrayWithOptions:(NSSortOptions)opts usingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);

数组的二分查找法

• (NSUInteger)indexOfObject:(ObjectType)obj inSortedRange:(NSRange)r options:(NSBinarySearchingOptions)opts usingComparator:(NSComparator NS_NOESCAPE)cmp NS_AVAILABLE(10_6, 4_0); // binary search

[Objective-C] NSArray的二分查找

http://www.isaced.com/post-241.html

NSMutableArray
交换指定 index1 和 index2 两个位置上的元素

• (void)exchangeObjectAtIndex:(NSUInteger)idx1 withObjectAtIndex:(NSUInteger)idx2;

使用anObject 对象替换 range 位置上的元素，
相当于删除 range位置的元素，然后在把 anobject 插入到这个位置

• (void)removeObject:(ObjectType)anObject inRange:(NSRange)range;
• (void)removeObject:(ObjectType)anObject;
• (void)removeObjectIdenticalTo:(ObjectType)anObject inRange:(NSRange)range;
• (void)removeObjectIdenticalTo:(ObjectType)anObject;

删除一定范围内的所有元素 （不推荐使用）

• (void)removeObjectsFromIndices:(NSUInteger *)indices numIndices:(NSUInteger)cnt NS_DEPRECATED(10_0, 10_6, 2_0, 4_0);

对当前的数组排序，使用排序算法

• (void)sortUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))compare context:(nullable void *)context;

排序

• (void)sortUsingComparator:(NSComparator)cmptr

进行数组排序

• (void)sortWithOptions:(NSSortOptions)opts usingComparator:(NSComparator)cmptrNS_AVAILABLE(10_6,4_0);

http://blog.sina.com.cn/s/blog_702e40a80101gagf.html
http://blog.csdn.net/u012973002/article/details/53033493