NSMutableArray基础-创建、添加、删除、替换

 1 #import <Foundation/Foundation.h>
 2 
 3 int main(int argc, const char * argv[]) {
 4     @autoreleasepool {
 5         //创建并设定数组元素个数
 6         NSMutableArray *arr1=[NSMutableArray arrayWithCapacity:7];
 7         //复制数组
 8         NSArray *arr2=@[@"mon",@"tue",@"wed",@"thu",@"fri",@"sat",@"sun"];
 9         NSMutableArray *arr3=[NSMutableArray arrayWithArray:arr2];
10         //向数组中添加一个元素
11         [arr3 addObject:@"eig"];
12         //根据指定下标插入元素
13         [arr3 insertObject:@"nin" atIndex:8];
14         //删除最后一个元素
15         [arr3 removeLastObject];
16         //根据指定下标删除元素
17         [arr3 removeObjectAtIndex:7];
18         //根据指定对象删除元素（若未找到返回NSNotfind
19         [arr3 removeObject:@"sun"];
20         //替换指定下标的元素
21         [arr3 replaceObjectAtIndex:0 withObject:@"one"];
22         //删除全部元素
23         [arr3 removeAllObjects];
24     }
25     return 0;
26 }