版本记录

前言

NSArray是集合类型中的一种，是OC中很重要的概念，这个是我们一定会用到的对象，下面我就继续由整体到细节，由简单到复杂的和大家说一下它的用法。

基本了解

NSArray系统提供的数组类：类似于C语言中的数组的功能，数组是一个大容器，数组中航韩国可以存储不同类型的对象，但必须要保证数组中储存的都是对象。

OC提供了两类数组：一类是NSArray(不可变数组)，一类是NSMutableArray(可变数组)。可变与不可变的区别：可变就意味着可以对原有对象进行操作，不可变就意味着一旦创建，内容就不可改变。

swift对于可变数组与不可变数组的定义也就是let与 var的区别。

API接口

下面我们就看一下NSArray的API接口。

#import <Foundation/NSObject.h>
#import <Foundation/NSEnumerator.h>
#import <Foundation/NSRange.h>
#import <Foundation/NSObjCRuntime.h>

@class NSData, NSIndexSet, NSString, NSURL;

/****************   Immutable Array     ****************/

NS_ASSUME_NONNULL_BEGIN

@interface NSArray<__covariant ObjectType> : NSObject <NSCopying, NSMutableCopying, NSSecureCoding, NSFastEnumeration>

@property (readonly) NSUInteger count;
- (ObjectType)objectAtIndex:(NSUInteger)index;
- (instancetype)init NS_DESIGNATED_INITIALIZER;
- (instancetype)initWithObjects:(const ObjectType _Nonnull [_Nullable])objects count:(NSUInteger)cnt NS_DESIGNATED_INITIALIZER;
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;

@end

@interface NSArray<ObjectType> (NSExtendedArray)

- (NSArray<ObjectType> *)arrayByAddingObject:(ObjectType)anObject;
- (NSArray<ObjectType> *)arrayByAddingObjectsFromArray:(NSArray<ObjectType> *)otherArray;
- (NSString *)componentsJoinedByString:(NSString *)separator;
- (BOOL)containsObject:(ObjectType)anObject;
@property (readonly, copy) NSString *description;
- (NSString *)descriptionWithLocale:(nullable id)locale;
- (NSString *)descriptionWithLocale:(nullable id)locale indent:(NSUInteger)level;
- (nullable ObjectType)firstObjectCommonWithArray:(NSArray<ObjectType> *)otherArray;
- (void)getObjects:(ObjectType __unsafe_unretained [])objects range:(NSRange)range NS_SWIFT_UNAVAILABLE("Use 'subarrayWithRange()' instead");
- (NSUInteger)indexOfObject:(ObjectType)anObject;
- (NSUInteger)indexOfObject:(ObjectType)anObject inRange:(NSRange)range;
- (NSUInteger)indexOfObjectIdenticalTo:(ObjectType)anObject;
- (NSUInteger)indexOfObjectIdenticalTo:(ObjectType)anObject inRange:(NSRange)range;
- (BOOL)isEqualToArray:(NSArray<ObjectType> *)otherArray;
@property (nullable, nonatomic, readonly) ObjectType firstObject NS_AVAILABLE(10_6, 4_0);
@property (nullable, nonatomic, readonly) ObjectType lastObject;
- (NSEnumerator<ObjectType> *)objectEnumerator;
- (NSEnumerator<ObjectType> *)reverseObjectEnumerator;
@property (readonly, copy) NSData *sortedArrayHint;
- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))comparator context:(nullable void *)context;
- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))comparator context:(nullable void *)context hint:(nullable NSData *)hint;
- (NSArray<ObjectType> *)sortedArrayUsingSelector:(SEL)comparator;
- (NSArray<ObjectType> *)subarrayWithRange:(NSRange)range;
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;
- (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomically;

- (void)makeObjectsPerformSelector:(SEL)aSelector NS_SWIFT_UNAVAILABLE("Use enumerateObjectsUsingBlock: or a for loop instead");
- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(nullable id)argument NS_SWIFT_UNAVAILABLE("Use enumerateObjectsUsingBlock: or a for loop instead");

- (NSArray<ObjectType> *)objectsAtIndexes:(NSIndexSet *)indexes;

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

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

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

- (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);

- (NSArray<ObjectType> *)sortedArrayUsingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);
- (NSArray<ObjectType> *)sortedArrayWithOptions:(NSSortOptions)opts usingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);

typedef NS_OPTIONS(NSUInteger, NSBinarySearchingOptions) {
    NSBinarySearchingFirstEqual = (1UL << 8),
    NSBinarySearchingLastEqual = (1UL << 9),
    NSBinarySearchingInsertionIndex = (1UL << 10),
};

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

@end

@interface NSArray<ObjectType> (NSArrayCreation)

+ (instancetype)array;
+ (instancetype)arrayWithObject:(ObjectType)anObject;
+ (instancetype)arrayWithObjects:(const ObjectType [])objects count:(NSUInteger)cnt;
+ (instancetype)arrayWithObjects:(ObjectType)firstObj, ... NS_REQUIRES_NIL_TERMINATION;
+ (instancetype)arrayWithArray:(NSArray<ObjectType> *)array;

- (instancetype)initWithObjects:(ObjectType)firstObj, ... NS_REQUIRES_NIL_TERMINATION;
- (instancetype)initWithArray:(NSArray<ObjectType> *)array;
- (instancetype)initWithArray:(NSArray<ObjectType> *)array copyItems:(BOOL)flag;

+ (nullable NSArray<ObjectType> *)arrayWithContentsOfFile:(NSString *)path;
+ (nullable NSArray<ObjectType> *)arrayWithContentsOfURL:(NSURL *)url;
- (nullable NSArray<ObjectType> *)initWithContentsOfFile:(NSString *)path;
- (nullable NSArray<ObjectType> *)initWithContentsOfURL:(NSURL *)url;

@end

@interface NSArray<ObjectType> (NSDeprecated)

/* This method is unsafe because it could potentially cause buffer overruns. You should use -getObjects:range: instead.
*/
- (void)getObjects:(ObjectType __unsafe_unretained [])objects NS_SWIFT_UNAVAILABLE("Use 'as [AnyObject]' instead");

@end

从上面可以看出来，有一个本类，还有几个分类，分别是NSExtendedArray、 NSArrayCreation和NSDeprecated，一共是三个分类。

下面我们看一下开发文档里面NSArray的描述。

1

2

3

4

下面我们就以表格的形式给出这些模块和模块信息。

后记

未完，待续~~~