【Foundation-10-1】#import Foundation/NSArray.h

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

@property (readonly) NSUInteger count; // 数组数量

- (id)objectAtIndex:(NSUInteger)index; // 数组某位置的obj

- (instancetype)init NS_DESIGNATED_INITIALIZER; // 初始化

- (instancetype)initWithObjects:(const id [])objects count:(NSUInteger)cnt NS_DESIGNATED_INITIALIZER;// c 数组创建

- (instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER; // 编码创建

</pre><pre name="code" class="objc">    NSArray *arr2 = @[@"1",@"2"];NSInteger count = arr2.count;NSString *str = [arr2 objectAtIndex:1];//    NSArray *arr3 = [[NSArray alloc]initWithCoder:<#(NSCoder *)#>];

@end

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