//在c语言中，数组中包含元素的类型是相同的，oc中数组，可包含可不同类型
NSArray * array =@[@"hello",
[NSNumber numberWithInteger:10],
[NSDate date]];
NSLog(@"array = %@",array);
/*******************构造方法创建*******************/
// 1 创建空数组
NSArray *array1 = [[NSArray alloc]init];
// 2通过传入元素 构造数组
NSArray *array2 = [[NSArray alloc]initWithObjects:@"hello",@"nihao",@"world", nil];
NSLog(@"array2 = %@",array2);
//3 传入数组 构造新数组
NSArray *array3 = [[NSArray alloc]initWithArray:array2];
NSLog(@"array3 = %@",array3);
/*********************类方法**************************/
//1 创建空数组 //用于新建数组的初始化
NSArray *array1 = [NSArray array];
//2传入一个元素创建数组
NSArray *array2 = [NSArray arrayWithObject:@"hello"];
NSLog(@"array2 = %@",array2);
//3 传入元素创建数组
NSArray *array3 = [NSArray arrayWithObjects:@"a",@"b",@"c", nil];
NSLog(@"array3 = %@",array3);
//4 通过传入数组创建数组
NSArray *array4 = [NSArray arrayWithArray:array3];
NSLog(@"array4 = %@",array4);
//5.使用一个数组中的某个范围 构造一个新数组
NSArray *subArray = [array subarrayWithRange:NSMakeRange(0, 3)];
NSLog(@"subArray = %@",subArray);
//6 用字符串指针类型数组构造数组
NSString *strings[3];//数组中有3个字符串类型的元素
strings[0] = @"one";
strings[1] = @"two";
strings[2] = @"three";
NSArray *stringArray = [NSArray arrayWithObjects:strings count:3];
NSLog(@"stringArray = %@",stringArray);
//数组的元素个数
NSArray *array = @[@"one",@"two",@"three",@"four",@"five"];
NSUInteger count = [array count];
NSLog(@"数组元素array的元素个数为：cnt = %lu",count);
// 获取数组下标元素
id obj = [array objectAtIndex:0];
// 判断是否属于某个类 对象 [isKindOfClass:[类 class]]
if ([obj isKindOfClass:[NSString class]])
{
NSLog(@"obj = %@",obj);
}
//添加元素
NSArray *array1 = [array arrayByAddingObject:@"six"];
NSLog(@"array1 = %@",array1);
//添加一个数组的所有元素 到另一个数组
NSArray *array2 = [array arrayByAddingObjectsFromArray:array1];
NSLog(@"array2 = %@",array2);
//把数组元素 通过特定拼接符 连接在一起
NSString *ArrayString = [array1 componentsJoinedByString:@" "];
NSLog(@"arrayString = %@",ArrayString);
//把字符串通过某个分隔符切割成数组
NSArray *StringArray = [ArrayString componentsSeparatedByString:@" "];
NSLog(@"stringArray = %@",StringArray);
// 判断数组中是否含有某个元素
BOOL ret = [array containsObject:@"one"];
NSLog(@"ret = %d",ret);
// 返回数组在传入数组中最先出现的元素
id obj1 = [array firstObjectCommonWithArray:array1];
NSLog(@"obj1 = %@",obj1);
//返回元素在数组中第一次出现的下标
NSUInteger index = [array indexOfObject:@"one"];
NSLog(@"index = %lu",index);
//返回元素在数组中某个范围内第一次出现的下标
NSUInteger index1 = [array indexOfObject:@"one" inRange:NSMakeRange(0, 3)];
NSLog(@"index1 = %lu",index1);
//判断两个数组是否相同
BOOL ret2 = [array isEqualToArray:array1];
NSLog(@"ret = %d",ret2);
//获取数组第一个元素
id obj2 = [array firstObject];
NSLog(@"obj2 = %@",obj2);
//获取数组最后一个元素
id obj3 = [array lastObject];
NSLog(@"obj3 = %@",obj3);
//数组的遍历
//1 通过数组的个数进行遍历
for (NSInteger i =0; i<[array count]; i++)
{
NSLog(@"%li i = %@",i,array[i]);
}
//2 for-in遍历
for (id obj in array)
{
NSLog(@"%@",obj);
}
//3 枚举器遍历 正序
NSEnumerator * enumerator = [array objectEnumerator];
id obj4 = nil;
while (obj4 = [enumerator nextObject])
{
NSLog(@"obj4= %@",obj4);
}
NSLog(@"-------------");
//逆序
NSEnumerator * reverseEnumerator = [array reverseObjectEnumerator];
id obj5 = nil;
while (obj5 = [reverseEnumerator nextObject])
{
NSLog(@"obj5 = %@",obj5);
}
//提取下标集合内的元素
NSMutableIndexSet * indexSet = [NSMutableIndexSet indexSetWithIndex:1];
[indexSet addIndex:2];
[indexSet addIndex:3];
NSArray *indexArray = [array objectsAtIndexes:indexSet];
NSLog(@"indexArray = %@",indexArray);
