数组简单操作

///字符串排序
NSArray *array = @[@"4",@"6",@"1",@"8",@"9",];

//升序排序
NSArray *resultArray = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"resultArray = %@",resultArray);

NSMutableArray *array = [NSMutableArray array];
[array addObject:@1];//@1=@"1"
[array addObject:@"one"];

///插入数据
[array insertObject:@2 atIndex:1];

///删除元素
[array removeObject:@"one"];

///清空数组
//    [array removeAllObjects];

///元素替换
[array replaceObjectAtIndex:1 withObject:@"wangyurui"];

NSLog(@"array = %@",array);

NSArray *array = @[@"1",@"2",@"3",@"4",];
NSLog(@"frist = %@",array.firstObject);
NSLog(@"last = %@",array.lastObject);

///字符串分割装进数组
NSString *myStr = @"I LOVE YOU";
NSArray *array1 = [myStr componentsSeparatedByString:@" "];
NSLog(@"array1 =%@",array1);

///字符串对数组元素进行拼接
NSString *myStr1 = [array1 componentsJoinedByString:@"-"];
NSLog(@"myStr1 = %@",myStr1);