❀自我唠嗑OC-数组类,字典类,集合类

/——————————————–数组NSArray———————————————/
//一个有序集合,管理有序的组的对象时使用

    //初始化    NSArray *array1 = [[NSArray alloc]initWithObjects:@"A",@"B",@"C",@"D",nil];    NSLog(@"array1=%@",array1);    NSArray *array2 = [[NSArray alloc] initWithArray:array1];    NSLog(@"array2=%@",array2);    //便利构造器    NSArray *array3 = [NSArray arrayWithObjects:@"w",@"x",@"y",@"z",nil];    NSLog(@"array3=%@",array3);    //语法糖    NSArray *array = @[@"A",@"B",@"C"];    NSLog(@"array=%@",array);

    //获取数组内元素个数    //- (NSUInteger)count;    char count = [array1 count];    NSLog(@"array1 count=%d",count);    NSLog(@"%lu",[array1 count]);    //返回指定索引的数组元素    //- (id)objectAtIndex:(NSUInteger)index;    NSLog(@"%@",[array1 objectAtIndex:[array1 count] - 2]);    NSLog(@"%@",[array1 objectAtIndex:2]);    NSLog(@"%@",array1[2]);    //判断数组中是否包含某个给定对象    //- (BOOL)containsObject:(id)anObject;    NSLog(@"%@",[array1 containsObject:@"D"] ? @"YES" : @"NO");    //追加对象    //- (NSArray *)arrayByAddingObject:(id)anObject;    NSLog(@"%@",[array1 arrayByAddingObject:@"F"]);    //追加其他数组    //- (NSArray *)arrayByAddingObjectsFromArray:(NSArray *)otherArray;    NSArray *array4 = [array1 arrayByAddingObjectsFromArray:array3];    NSLog(@"追加后为:%@",array4);    //NSLog(@"%@",[array1 arrayByAddingObjectsFromArray:array3]);    //获取数组中元素对象的下标    //- (NSUInteger)indexOfObject:(id)anObject;    NSUInteger uint = [array1 indexOfObject:@"C"];    NSLog(@"下标:%lu",uint);    //分割字符串存入数组    //- (NSArray<NSString *> *)componentsSeparatedByString:(NSString *)separator;    NSString *string = @"www.baidu.com";    NSArray *array5 = [string componentsSeparatedByString:@"."];    NSLog(@"%@",array5);    //分割数组为字符串    //- (NSString *)componentsJoinedByString:(NSString *)separator;    NSString *string1 = [array1 componentsJoinedByString:@","];    NSLog(@"%@",string1);    //NSLog(@"%@",[array1 componentsJoinedByString:@","]);

/————————————可变数组NSMutableArray————————————/

    //初始化    NSMutableArray *MutableArray = [[[NSMutableArray alloc] initWithObjects:@"blue",@"gray",@"green",nil] autorelease];    //便利构造器    NSMutableArray *MutableArray1 = [NSMutableArray arrayWithCapacity:0];    //语法糖    NSMutableArray *MutableArray2 = [@[@"January",@"February",@"March",@"April"] mutableCopy];

    //添加对象    //- (void)addObject:(id)anObject;    [MutableArray addObject:@"sky"];    NSLog(@"%@",MutableArray);    //指定索引位置插入对象    //- (void)insertObject:(id)anObject atIndex:(NSUInteger)index;    [MutableArray insertObject:@"red" atIndex:1];    NSLog(@"%@",MutableArray);    //移除最后一个对象    //- (void)removeLastObject;    [MutableArray removeLastObject];    NSLog(@"%@",MutableArray);    //移除指定索引位置对象    //- (void)removeObjectAtIndex:(NSUInteger)index;    [MutableArray removeObjectAtIndex:1];    NSLog(@"%@",MutableArray);    //替换指定索引位置对象    //- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject;    [MutableArray replaceObjectAtIndex:1 withObject:@"black"];    NSLog(@"%@",MutableArray);    //销毁数组    //- (void)removeAllObject;    [MutableArray removeAllObjects];    NSLog(@"%@",MutableArray);    //交互指定索引之间的对象    //- (void)exchangeObjectAtIndex:(NSUInteger)idx1 withObjectAtIndex:(NSUInteger)idx2;    [MutableArray2 exchangeObjectAtIndex:0 withObjectAtIndex:2];    NSLog(@"%@",MutableArray2);    //移除指定对象    //- (void)removeObject:(id)anObject;    [MutableArray2 removeObject:@"April"];    NSLog(@"%@",MutableArray2);    //移除指定区域指定对象,根据对象isEqual消息判断    //- (void)removeObject:(id)anObject inRange:(NSRange)range;    [MutableArray2 removeObject:@"March" inRange:NSMakeRange(0, 2)];    NSLog(@"%@",MutableArray2);    //指定(数组B的指定区域）的元素替换（数组A的指定区域）    //- (void)replaceObjectsInRange:(NSRange)range withObjectsFromArray:(NSArray *)otherArray range:(NSRange)otherRange;    NSMutableArray *MutableArray3 = [NSMutableArray arrayWithObjects:@"May",@"June",@"July",nil];    [MutableArray2 replaceObjectsInRange:NSMakeRange(0, 1) withObjectsFromArray:MutableArray3 range:NSMakeRange(0, 2)];    NSLog(@"%@",MutableArray2);    //追加数组A到数组B    //- (void)addObjectsFromArray:(NSArray *)otherArray;    NSMutableArray *MutableArray4 = [NSMutableArray arrayWithObjects:@"August", nil];    [MutableArray2 addObjectsFromArray:MutableArray4];    NSLog(@"%@",MutableArray2);

//OC冒泡排序    NSMutableArray *muArray = [NSMutableArray array];    for (int i = 0; i < 10; i++) {        NSNumber *num = [NSNumber numberWithInteger:arc4random() % 90];        [muArray addObject:num];    }    for (int i = 0; i < [muArray count] - 1; i++) {        for (int j = 0; j < [muArray count] - 1 - i; j++) {            if ([muArray[j] integerValue] > [muArray[j + 1] integerValue]) {                [muArray exchangeObjectAtIndex:j withObjectAtIndex:j + 1];//直接将索引对象交换            }            //方法2//            if (muArray[j] > muArray[j + 1]) {//                int a = [muArray [j] intValue];//                int b = [muArray[j + 1] intValue];//                if (a > b) {//                    NSString *max = muArray[j];//                    muArray[j] = muArray[j + 1];//                    muArray[j + 1] = max;//                }//            }        }    }    NSLog(@"%@",muArray);

/—————————————-字典NSDictionary——————————————/
//无序集合,存储对象为各个键值对,获取数据时需使用对应的key操作,一个value 对应一个key

    //字典初始化    NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:@"apple",@"name",@"pear",@"name1",@"melon",@"name2",@"grape",@"name3", nil];    //便利构造器    NSDictionary *dic1 = [NSDictionary dictionaryWithObjectsAndKeys:@"apple",@"name",@"pear",@"name1",@"melon",@"name2",@"grape",@"name3", nil];    //字面量    NSDictionary *dic2 = @{@"key1":@"apple",@"key2":@"pear"};

    //获得所有的key    NSArray *keyArray = [dic allKeys];    NSLog(@"%@",keyArray);    //获得所有value    NSArray *valueArray = [dic1 allValues];    NSLog(@"%@",valueArray);    //通过key找到value    NSLog(@"%@",[dic objectForKey:@"name3"]);

/——————————-可变字典NSMutableDictionary———————————-/

 //初始化    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"apple",@"name",@"pear",@"name1",@"melon",@"name2",@"grape",@"name3", nil];    //向词典中动态添加数据,key相同则替换掉value,如没相同key则添加value;    //-(void)setObject:(id)anObject forKey:(id<NSCopying>)akey    //NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];    [dictionary setObject:@"lemon" forKey:@"name"];    NSLog(@"%@",dictionary);    //通过key移除某个value    //- (void)removeObjectForKey:(id)aKey;    [dictionary removeObjectForKey:@"name2"];    NSLog(@"%@",dictionary);    //销毁所有字典所有数据    //- (void)removeAllObjects;    [dictionary removeAllObjects];    NSLog(@"%@",dictionary);

/———————————————集合NSSet———————————————-/
//无序容器,容器中对象不能重复,不可变集合一旦创建,集合中的对象无法修改,只能从集合中读取对象,并且没有快速创建集合对象的字面量

 //初始化    NSSet *nam = [[NSSet alloc] initWithObjects:@"apple",@"pear",@"grape", nil];    //便利构造器    NSSet *nam1 = [NSSet setWithObjects:@"apple",@"pear",@"grape", nil];

 //获取集合中对象的个数    //@property (readonly) NSUInteger count;    NSLog(@"%lu",[nam count]);    //获取集合中所有的对象    //@property (readonly, copy) NSArray    //*allObjects;    NSLog(@"%@",[nam allObjects]);    //从集合获取任意一个对象    //- (id)anyObject;    NSLog(@"%@",[nam1 anyObject]);    //判断集合中是否包含某一个指定的对象    //- (BOOL)containsObject:(id)anObject;    NSLog(@"contain:%d",[nam1 containsObject:@"grape"]);    //判断两个集合是否匹配    NSLog(@"isEqual:%d",[nam1 isEqual:nam]);

/—————————————-NSMutableSet创建—————————————-/

    //初始化方法    //NSMutableSet *name = [[NSMutableSet alloc] initWithCapacity:0];    //便利构造器    //NSMutableSet *name1 = [NSMutableSet setWithCapacity:0];    NSMutableSet *color = [[NSMutableSet alloc] initWithObjects:@"red",@"yellow",@"blue", nil];    //添加一个对象    //- (void)addObject:(id)object;    [color addObject:@"green"];    NSLog(@"%@",color);    //NSLog(@"%@",[color addObject:@"green"]);    //移除一个对象    //- (void)removeObject:(id)object;    [color removeObject:@"red"];    NSLog(@"%@",color);    //移除所有对象    //- (void)removeAllObjects;    [color removeAllObjects];    NSLog(@"%@",color);

❀❀三类写法大同小异,运用十分频繁,加强练习提高熟练程度❀❀