不可变长度的Set
@interface NSSet : NSObject <NSCopying, NSMutableCopying, NSSecureCoding, NSFastEnumeration>
初始化方法
+ (instancetype)set; //声明一个空集+ (instancetype)setWithObject:(id)object;+ (instancetype)setWithObjects:(const id [])objects count:(NSUInteger)cnt;+ (instancetype)setWithObjects:(id)firstObj, … NS_REQUIRES_NIL_TERMINATION;+ (instancetype)setWithSet:(NSSet *)set;+ (instancetype)setWithArray:(NSArray *)array;- (instancetype)init;/* designated initializer */- (instancetype)initWithObjects:(const id [])objects count:(NSUInteger)cnt;/* designated initializer */- (instancetype)initWithObjects:(id)firstObj, … NS_REQUIRES_NIL_TERMINATION;- (instancetype)initWithSet:(NSSet *)set;- (instancetype)initWithSet:(NSSet *)set copyItems:(BOOL)flag;- (instancetype)initWithArray:(NSArray *)array;
可变长度的Set
@interface NSMutableSet : NSSet
对象操作
– (void)addObjectsFromArray:(NSArray *)array;- (void)intersectSet:(NSSet *)otherSet; //与另个set取交集- (void)minusSet:(NSSet *)otherSet; //减去一个set- (void)removeAllObjects;- (void)unionSet:(NSSet *)otherSet; //与另个set取并集- (void)setSet:(NSSet *)otherSet; //清空当前set，，并将另个set中的元素加进来，简单讲 就是 self=otherSet初始化+ (instancetype)setWithCapacity:(NSUInteger)numItems;-(instancetype)init;/* designated initializer */- (instancetype)initWithCapacity:(NSUInteger)numItems;
关于初始化还可以用直接赋值的方法：NSSet *set = (@"aa", @77);//不需要在结尾处再弄个nil了
NSLog(@"block 遍历————"); [set enumerateObjectsUsingBlock:^(id obj, BOOL *stop) { NSLog(@"%@", obj); }]; NSLog(@"枚举器 遍历————"); NSEnumerator* enumerator = [set objectEnumerator]; NSString *str; while (str = [enumerator nextObject]) { NSLog(@"%@", str); }
这两种遍历方法 也适用于 Array
不可变长度Array
@interface NSArray : NSObject <NSCopying, NSMutableCopying, NSSecureCoding, NSFastEnumeration>常用方法- (NSUInteger)count;- (id)objectAtIndex:(NSUInteger)index;
– (id) indexOfObject…
– (id)firstObject;- (id)lastObject;- (NSEnumerator *)objectEnumerator;- (NSEnumerator *)reverseObjectEnumerator; //反向枚举器
– (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context; //使用函数排序- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context hint:(NSData *)hint;- (NSArray *)sortedArrayUsingSelector:(SEL)comparator; //使用oc方法排序
– (NSArray *)subarrayWithRange:(NSRange)range; //返回范围内的子数组- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile; //写入数组到文件- (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomically; //写入数组到url
初始化方法
+ (instancetype)array; //返回一个空数组+ (instancetype)arrayWithObject:(id)anObject;+ (instancetype)arrayWithObjects:(const id [])objects count:(NSUInteger)cnt;+ (instancetype)arrayWithObjects:(id)firstObj, … NS_REQUIRES_NIL_TERMINATION;+ (instancetype)arrayWithArray:(NSArray *)array;- (instancetype)init;/* designated initializer */- (instancetype)initWithObjects:(const id [])objects count:(NSUInteger)cnt;/* designated initializer */- (instancetype)initWithObjects:(id)firstObj, … NS_REQUIRES_NIL_TERMINATION;- (instancetype)initWithArray:(NSArray *)array;- (instancetype)initWithArray:(NSArray *)array copyItems:(BOOL)flag;+ (id /* NSArray * */)arrayWithContentsOfFile:(NSString *)path; //从文件读取出数组+ (id /* NSArray * */)arrayWithContentsOfURL:(NSURL *)url; //从url- (id /* NSArray * */)initWithContentsOfFile:(NSString *)path;- (id /* NSArray * */)initWithContentsOfURL:(NSURL *)url;可变长度Array
@interface NSMutableArray : NSArray
常用操作方法
– (void)addObject:(id)anObject;- (void)insertObject:(id)anObject atIndex:(NSUInteger)index;- (void)removeLastObject;- (void)removeObjectAtIndex:(NSUInteger)index;- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject;
直接初始化数组： NSArray *array = @[@"aa", @66]; //@66-NSInteger
人生没有彩排，只有现场直播，所以每一件事都要努力做得最好
