iphone - NsMutableArray 无故更改为 UITableViewCellContentView

Question

我有一个问题。在 UITableViewController 的 viewDidLoad 方法中，我有:

myfields = [NSMutableArray array];
    for (int x = 0; x < 10; x++) {
        UITextField * field = [[UITextField alloc] initWithFrame:CGRectMake(130,12,150,25)];
        field.backgroundColor = [UIColor clearColor];
        field.font = [UIFont systemFontOfSize:15];
        field.delegate = [[OptionFieldDelegate alloc] init];
        [myfields addObject: field];
    }
    NSLog(@"myfields array - %@",myfields);

这给出了这个输出:

myfields array - (
    "<UITextField: 0x6a35b50; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a35c60>>",
    "<UITextField: 0x6a36820; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a367f0>>",
    "<UITextField: 0x6a374e0; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a374b0>>",
    "<UITextField: 0x6a382e0; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a382b0>>",
    "<UITextField: 0x6a38ea0; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a38e70>>",
    "<UITextField: 0x6a39950; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a39a60>>",
    "<UITextField: 0x6a3a630; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a3a600>>",
    "<UITextField: 0x6a3b1f0; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a3b1c0>>",
    "<UITextField: 0x6a3bdb0; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a3bd80>>",
    "<UITextField: 0x6a3c970; frame = (130 12; 150 25); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x6a3c880>>"
)

这很好，但下一点不是。在需要之前我不会触摸该数组，但在 - tableView:cellForRowAtIndexPath: 方法中我有这个:

NSLog(@"Array = %@",myfields);
                    NSLog(@"class - %@",NSStringFromClass([myfields class]));
                    NSLog(@"0 - %i",[indexPath row] - 2);
                    NSLog(@"1 - %@",[myfields objectAtIndex:[indexPath row] - 2]);
                    [[cell contentView] addSubview: [myfields objectAtIndex:[indexPath row] - 2]];

这是输出:

2010-11-13 00:58:13.808 Poll Maker[1803:207] Array = <UITableViewCellContentView: 0x6a35b10; frame = (10 1; 300 43); layer = <CALayer: 0x6a3e680>>
2010-11-13 00:58:13.809 Poll Maker[1803:207] class - UITableViewCellContentView
2010-11-13 00:58:13.809 Poll Maker[1803:207] 0 - 0
2010-11-13 00:58:13.810 Poll Maker[1803:207] -[UITableViewCellContentView objectAtIndex:]: unrecognized selector sent to instance 0x6a35b10
2010-11-13 00:58:13.812 Poll Maker[1803:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewCellContentView objectAtIndex:]: unrecognized selector sent to instance 0x6a35b10'

我很迷茫。谁能帮我？谢谢你。

Answer 1

你犯了一个内存管理错误。如果您希望数组停留在第一种方法结束之后，您必须保留该数组。

在您的情况下，数组曾经所在的内存(在自动释放池释放之前)被 UITableViewCell 的 subview 覆盖。