我有一个表视图,当选择一行时,您将带您进入详细信息页面。详细信息页面上有一个图像视图。当选择行时,我试图从表视图设置图像视图的图像,但是当选择行并且详细信息出现时,只有一个白页。
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
这发生了,因为在第一次呼叫-[UIViewController view]
期间,视图懒洋洋地加载了视图。因此,当您尝试设置图像时,detail.bandImage
是零。
在GRSBandDetailViewController
初始化器或通过属性中提供UIImage
。然后将bandImage.image
设置为viewDidLoad
中此属性的值。
我通过将其添加到详细信息控制器中解决了问题。
@property (nonatomic, strong) UIImage *passedImage;
@property (nonatomic, strong) NSString *titleString;
和ViewDidload现在有:
- (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:
- (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];
}