OC-数组类

NSArray

创建一个不可变数组对象

NSMutableArray

创建可变数组对象

数组中的元素都是对象可以是任意类型的对象

/*数组中存放的对象的引用*/

/* 数组的初始化方法：NSArray 创建的数组不能被修改*/

1.OC中的数组初始化

包括类方法初始化和对象方法初始化两种方式：

 1 int main(int argc, const char * argv[]) {
 2     @autoreleasepool {
 3         //直接创建一个常量数组
 4         NSArray *array1 = @[@"one",@"two",@"three"];
 5         NSLog(@"array1 = %@",array1);
 6         
 7         /*
 8          OC中的数组类似于C语言中的指针数组，但是指针数组只能同一类型的，而OC中的数组可以是任意类型的
 9          */
10         //用不同对象来初始化数组
11         NSArray *array2 = [[NSArray alloc]initWithObjects:@"hello world", [NSNumber numberWithInt:123],[NSDate date],[NSNumber numberWithFloat:3.14],nil];
12         NSLog(@"array2 = %@",array2);
13         
14         //用其他已经存在的数组来创建数组
15         NSArray *array3 = [[NSArray alloc]initWithArray:array1];
16         NSLog(@"array3 = %@",array3);
17         
18         //copyItems:拷贝一份
19         //copyItems:直接return
20         NSArray *array4 = [[NSArray alloc]initWithArray:array2 copyItems:YES];
21         NSLog(@"array4 = %@",array4);
22         
23         //类方法
24         //创建一个空的数组对象
25         NSArray *array5 = [NSArray array];
26         NSLog(@"array5 = %@",array5);
27         
28         //多个对象创建一个数组
29         NSArray *array6 = [NSArray arrayWithObjects:@"one",@"two",[NSNumber numberWithFloat:3.14],nil];
30         NSLog(@"array6 = %@",array6);
31         
32         //用已经存在的数组创建数组
33         NSArray *array7 = [NSArray arrayWithArray:array6];
34         NSLog(@"array7 = %@",array7);
35     }
36     return 0;
37 }

View Code

2.OC数组的操作函数

  1 int main(int args,const char *argv[])
  2 {
  3     @autoreleasepool {
  4         NSArray *array1 = [[NSArray alloc]initWithObjects:@"123",@"abc",@"oop", nil];
  5         NSLog(@"array1 = %@",array1);
  6         
  7         //计算数组的长度
  8         NSInteger count = [array1 count];
  9         NSLog(@"count = %ld",count);
 10         
 11         //获取指定位置的对象
 12         id obj = [array1 objectAtIndex:2];
 13         NSLog(@"obj = %@",obj);
 14         
 15         //在数组中添加一个对象：其实是在底层中生成一个新的数组对象
 16         NSArray *array2 = [array1 arrayByAddingObject:@"alibb"];
 17         NSLog(@"array2 = %@",array2);
 18         
 19         //将传入的数组添加到一个数组的末尾
 20         NSArray *otherArray = [[NSArray alloc]initWithObjects:@"add",@"sub",@"mul",@"div", nil];
 21         NSArray *array3 = [array1 arrayByAddingObjectsFromArray:otherArray];
 22         NSLog(@"array3 = %@",array3);
 23         
 24         //用指定字符串连接数组元素
 25         NSLog(@"array1 = %@",array1);
 26         NSString *str = [array1 componentsJoinedByString:@"##"];
 27         NSLog(@"str = %@",str);
 28         
 29         //判断是否包含对象
 30         BOOL flag = [array1 containsObject:@"oop"];
 31         NSLog(@"flag = %i",flag);
 32         
 33         //返回两个数组中第一个公共的对象
 34         id obj2 = [array1 firstObjectCommonWithArray:otherArray];
 35         NSLog(@"obj2 = %@",obj2);
 36         
 37         
 38         //返回数组中第一次出现的下标位置
 39         NSArray *array4 = [[NSArray alloc]initWithObjects:@"add",@"sub",@"mul",@"zjl",@"mul",@"div", nil];
 40         NSUInteger index = [array4 indexOfObject:@"mul"];
 41         NSLog(@"index = %lu",index);
 42         //在数组的指定范围内查找第一次出现的对象，并返回下标
 43         NSUInteger indexRange = [array4 indexOfObject:@"mul" inRange:NSMakeRange(3, 3)];
 44         NSLog(@"index2 = %lu",indexRange);
 45         
 46         //判断两个数组是否相等
 47         BOOL flag1 = [array1 isEqualToArray:array4];
 48         NSLog(@"flag1 = %i",flag1);
 49         
 50         //获取数组中的第一个元素
 51         id obj3 = [array4 firstObject];
 52         NSLog(@"obj3 = %@",obj3);
 53         
 54         //获取数组中的最后一个元素
 55         id obj4 = [array4 lastObject];
 56         NSLog(@"ojb4 = %@",obj4);
 57         
 58         
 59         //重要：数组的遍历   有三种方法
 60         //1.下标法
 61         NSArray *array5 = @[@"one",@"two",@"three",@"foure",@"five"];
 62         NSUInteger len = [array5 count];
 63         for (int i=0; i<len; i++) {
 64             NSLog(@"array5[%i] = %@",i,[array5 objectAtIndex:i]);
 65         }
 66         //2.枚举器法
 67         NSEnumerator *enumerator = [array5 objectEnumerator]; //生成枚举器对象
 68         //通过枚举器对象来遍历对象
 69         id item = nil;
 70         while (item = [enumerator nextObject]) {
 71             NSLog(@"%@",item);
 72         }
 73         //通过枚举器法反向变量数组
 74         NSEnumerator *reverseEnumerator = [array5 reverseObjectEnumerator];
 75         id item1 = nil;
 76         while (item1 = [reverseEnumerator nextObject]) {
 77             NSLog(@"item1 = %@",item1);
 78         }
 79         //3.快速枚举法  //速度最快
 80         for (id item2 in array5) {
 81             NSLog(@"item2 = %@",item2);
 82         }
 83         
 84         //数组排序，通过选择器
 85         NSArray *array6 = @[@"one",@"two",@"three",@"four",@"five"];
 86         NSArray *array7 = [array6 sortedArrayUsingSelector:@selector(compare:)];
 87         NSLog(@"array7 = %@",array7);
 88         
 89         //数组提取
 90         NSArray *array8 = [array6 subarrayWithRange:NSMakeRange(1, 3)];
 91         NSLog(@"array8 = %@",array8);
 92         
 93         
 94         //通过对象下标集合获取指定的数组对象
 95         //创建一个下标集合
 96         NSMutableIndexSet *indexSet = [[NSMutableIndexSet alloc] initWithIndex:0];
 97         [indexSet addIndex:2];
 98         [indexSet addIndex:4];
 99         [indexSet addIndex:0];
100         //通过对象下标集合获取指定的数组对象
101         NSArray *array9 = [array6 objectsAtIndexes:indexSet];
102         NSLog(@"array9 = %@",array9);
103     }
104 }

View Code

3.OC可变数组的操作函数(特有的)

 1 int main(int args,const char *argv[])
 2 {
 3     @autoreleasepool {
 4         NSMutableArray *mulArray = [[NSMutableArray alloc] initWithCapacity:20];
 5         NSMutableArray *mulArray1 = [NSMutableArray arrayWithCapacity:20];
 6         
 7         
 8         [mulArray addObject:@"one"];
 9         NSLog(@"mulArray = %@",mulArray);
10         
11         //指定位置中插入对象
12         [mulArray insertObject:@"two" atIndex:1];
13         NSLog(@"mulArray = %@",mulArray);
14         
15         //将给定的数组插入到可变数组末尾
16         [mulArray addObjectsFromArray:@[@"123",@"567",@"890"]];
17         NSLog(@"mulArray = %@",mulArray);
18         
19         //删除数组最后一个元素
20         [mulArray removeLastObject];
21         NSLog(@"mulArray = %@",mulArray);
22         
23         //从数组删除指定对象
24         [mulArray removeObject:@"123"];
25         NSLog(@"mulArray = %@",mulArray);
26         
27         //删除数组中指定位置的元素
28         [mulArray removeObjectAtIndex:1];
29         NSLog(@"mulArray = %@",mulArray);
30         
31         //替换指定位置的元素
32         [mulArray replaceObjectAtIndex:0 withObject:@"five"];
33         NSLog(@"mulArray = %@",mulArray);
34         
35         //交换两个位置的元素
36         [mulArray exchangeObjectAtIndex:0 withObjectAtIndex:1];
37         NSLog(@"mulArray = %@",mulArray);
38         
39         [mulArray addObjectsFromArray:@[@"aaa",@"ccc",@"bbb",@"ccc",@"ddd",@"eee",@"fff"]];
40         
41         //在指定范围内删除指定对象
42         [mulArray removeObject:@"567" inRange:NSMakeRange(0, 1)];
43         NSLog(@"mulArray = %@",mulArray);
44         
45         //删除数组中指定的所有对象
46         [mulArray removeObject:@"ccc"];
47         NSLog(@"mulArray = %@",mulArray);
48         
49         //删除所有在传入数组中出现的元素
50         [mulArray removeObjectsInArray:@[@"aaa",@"bbb",@"888"]];
51         NSLog(@"mulArray = %@",mulArray);
52         
53         //删除所有在指定范围内的元素
54         [mulArray removeObjectsInRange:NSMakeRange(1, 2)];
55         NSLog(@"mulArray = %@",mulArray);
56         
57         
58         //用给定的数组 修改数组(重置)数组
59         [mulArray setArray:@[@"123",@"345",@"567",@"789"]];
60         NSLog(@"mulArray = %@",mulArray);
61         
62         
63         //数组排序
64         NSMutableArray *sortArray = [NSMutableArray array];
65         [sortArray sortUsingSelector:@selector(compare:)];
66         NSLog(@"sortArray = %@",sortArray);
67         
68         
69         //用传入的数组替换指定范围内的数组元素
70         //用传入的数组替换指定范围内的数组元素
71         [mulArray replaceObjectsInRange:NSMakeRange(0, 2) withObjectsFromArray:@[@"one",@"two",@"three"]];
72         NSLog(@"mulArray = %@", mulArray);
73     }
74 }

View Code

posted on 2015-06-11 20:05 Beyond平君阅读(883) 评论(0) 编辑收藏举报

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OC-数组类