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#"];

数组：
        //1.不可变数组
//        NSArray *fruitArr = [[NSArray alloc]initWithObjects:@"apple",@"banana",@"pear",@"watermelon",@"longan",nil];
//        NSLog(@"%@",fruitArr);
//        NSLog(@"%lu",[fruitArr count]);
//        NSString *obj = [fruitArr objectAtIndex:2];
//        NSLog(@"%@",obj);
//
//        NSArray *appleArr = [NSArray arrayWithObjects:@"apple",@"banana",@"pear",nil];
//        NSLog(@"%@",appleArr);
//
//        NSArray *names = @[@"tom",@"jack",@"kitty"];
//        NSLog(@"%@",names);
        
        //2.可变数组
         NSMutableArray *languages=[NSMutableArray array];
        [languages addObject:@"c++"];
        [languages addObject:@"oc "];
        [languages addObject:@"java"];
        [languages addObject:@"php"];
        NSLog(@"%@",languages);
        [languages insertObject:@"swift" atIndex:1];
        NSLog(@"%@",languages);
        [languages removeObject:@"php"];
        [languages removeObjectAtIndex:0];
        [languages replaceObjectAtIndex:1 withObject:@"c#"];
        NSLog(@"%@",languages);
        
        //数组的遍历
//        for (int i=0; i<[languages count]; i++) {
//            NSLog(@"第%d个对象：%@",i+1,[languages objectAtIndex:i]);
//        }
        //
        for (NSString *obj in languages) {
            NSLog(@"%@",obj);
        }

ie