数组拼接

 1  　　NSMutableArray *arr = [[NSMutableArray alloc] initWithArray:@[@"a",@"b",@"c"]];
 2     
 3     NSArray *arr1 = @[@"1",@"2"];
 4     
 5     NSRange range = NSMakeRange(0, arr1.count);
 6     NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:range];
 7     [arr insertObjects:arr1 atIndexes:indexSet];
11     
12     NSLog(@"%@",arr);//

(

    1,

    2,

    a,

    b,

    c

)