Question

我有一个表格视图，当选择一行时，它会带您进入详细页面。详细信息页面上有图像视图。我正在尝试在选择行时从表视图设置图像视图的图像，但是当选择行并且详细视图出现时，除了白页之外什么都没有。

像这样：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    GRSBandDetailViewController *detail = [[GRSBandDetailViewController alloc]initWithNibName:@"GRSBandDetailViewController" bundle:nil];

    if (indexPath.row == 0)
    {
        [detail.bandImage setImage:[UIImage imageNamed:@"AbovetheUnderground.png"]];
        [self.navigationController pushViewController:detail animated:YES];
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

这是GRSBandDetailViewController的.h文件：

@interface GRSBandDetailViewController : UIViewController
{
    IBOutlet UIImageView *bandImage;
}

@property (nonatomic, strong) UIImageView *bandImage;

@end

Answer 1

这种情况正在发生，因为在第一次调用-[UIViewController view]期间，视图被懒惰地加载。因此，当您尝试设置图像时，detail.bandImage为零。

在UIImage初始值设定项中或通过属性提供GRSBandDetailViewController。然后将bandImage.image设置为viewDidLoad中此属性的值。

Answer 2

我通过将此问题添加到详细视图控制器来修复此问题。

@property (nonatomic, strong) UIImage *passedImage;

@property (nonatomic, strong) NSString *titleString;

viewDidLoad现在有这个：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    self.title = titleString;
    bandImage.image = passedImage;
}

表视图中的didSelectRowAtIndexPath方法如下所示：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    GRSBandDetailViewController *detail = [[GRSBandDetailViewController alloc]initWithNibName:@"GRSBandDetailViewController" bundle:nil];

    if (indexPath.row == 0)
    {
        [self.navigationController pushViewController:detail animated:YES];
        detail.passedImage = [UIImage imageNamed:@"AbovetheUnderground.png"];
        detail.titleString = @"Above the Underground";
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

在另一个视图控制器中设置UIImageView

2 个答案: