2

这段代码会导致错误,但它应该是正确的。

(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSNumber *rowNumber = [[NSNumber alloc] initWithInt:indexPath.row];
    [genreArray addObject:rowNumber];
    [self.tableView reloadData];
}

genreArray是一个NSMutableArray

但是在触摸一个单元格时,我得到了这个错误

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'
*** First throw call stack:
(0x1c9c012 0x10d9e7e 0x1c9bdeb 0x1d1c9a5 0x1d1c8b0 0x7b4c 0xcd285 0xcd4ed 0xad75b3 0x1c5b376 0x1c5ae06 0x1c42a82 0x1c41f44 0x1c41e1b 0x1bf67e3 0x1bf6668 0x1dffc 0x271d 0x2645)
libc++abi.dylib: terminate called throwing an exception

有谁知道为什么这不起作用?

4

1 回答 1

3

因为您的数组是不可变的...检查您实例化的代码genreArray:类型声明和实例化都必须使用NSMutableArray

//valid declaration + instantiation
NSMutableArray *genreArray = [NSArray array]; 

//valid at compile-time : genreArray is supposed to be mutable
//however will result in runtime error : genreArray is actually immutable
[genreArray addObject:anObject];
于 2013-02-06T07:53:13.157 回答