Object-C-NSArray

NSArray *fruitArray=[[NSArray alloc] initWithObjects:@"apple",@"banana",@"pear",nil];开辟一个不可变的数组

NSString *obj=[fruitArray objectAtIndex:1];

NSArray *names=@[@"tom",@"jack",@"maggie"];

NSMutableArray *languages=[NSMutableArray array];

[languages addObject:@"c++"];

[languages addObject:@"Objc"]; 添加元素

[languages insertObject:@"swift" atIndex:1];

[languages removeObject:@"c++"];

[languages removeAllObjects];

[languages removeObjectAtIndex:0];

[languages replaceObjectAtIndex:0 withObject:@"c#"];

 1 数组：
 2         //1.不可变数组
 3 //        NSArray *fruitArr = [[NSArray alloc]initWithObjects:@"apple",@"banana",@"pear",@"watermelon",@"longan",nil];
 4 //        NSLog(@"%@",fruitArr);
 5 //        NSLog(@"%lu",[fruitArr count]);
 6 //        NSString *obj = [fruitArr objectAtIndex:2];
 7 //        NSLog(@"%@",obj);
 8 //
 9 //        NSArray *appleArr = [NSArray arrayWithObjects:@"apple",@"banana",@"pear",nil];
10 //        NSLog(@"%@",appleArr);
11 //
12 //        NSArray *names = @[@"tom",@"jack",@"kitty"];
13 //        NSLog(@"%@",names);
14         
15         //2.可变数组
16          NSMutableArray *languages=[NSMutableArray array];
17         [languages addObject:@"c++"];
18         [languages addObject:@"oc "];
19         [languages addObject:@"java"];
20         [languages addObject:@"php"];
21         NSLog(@"%@",languages);
22         [languages insertObject:@"swift" atIndex:1];
23         NSLog(@"%@",languages);
24         [languages removeObject:@"php"];
25         [languages removeObjectAtIndex:0];
26         [languages replaceObjectAtIndex:1 withObject:@"c#"];
27         NSLog(@"%@",languages);
28         
29         //数组的遍历
30 //        for (int i=0; i<[languages count]; i++) {
31 //            NSLog(@"第%d个对象：%@",i+1,[languages objectAtIndex:i]);
32 //        }
33         //
34         for (NSString *obj in languages) {
35             NSLog(@"%@",obj);
36         }

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