如何重新加载当前UIView

Question

我有一个方法，我从我的主视图调用，即设置我想要显示在滚动视图中的图像的图像名称。

- (void)loadImage:(NSString *)myImageName 
    { 
     if (myImageName == @"one") { 
      imageName = myImageName; 
     } 
     if (myImageName == @"two") { 
      imageName = myImageName; 
     } 
     if (myImageName == @"three") { 
      imageName = myImageName; 
     } 

     //Reloads view here??? 
    } 

我加载在我viewDidLoad方法的相似图片时，我设置为从parentview的imagename从tableviewcell选择我NSString的向下传递到的LoadImage所以

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

    //Create scrollview 
    scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]; 
    scrollView.delegate = self; 
    scrollView.bounces = NO; 

    //Create scrollviewimage 
    if (imageName == @"one") { 
     image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ha.png"]]; 
    } 
    if (imageName == @"two") { 
     image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"haha.png"]]; 
    } 
    if (imageName == @"three") { 
     image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"hahaha.png"]]; 
    } 



    containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 550)]; 
    //Add subview 
    [containerView addSubview:image]; 
    //initViews 
    scrollView.contentSize = containerView.frame.size; 
    [scrollView addSubview:containerView]; 

    //scrolling 
    scrollView.minimumZoomScale = 1.0; 
    scrollView.maximumZoomScale = 31.0; 
    [scrollView setZoomScale:scrollView.minimumZoomScale]; 

    //highrachy 
    [self.view addSubview:scrollView]; 

} 

会发生什么事..然后载荷图像设置viewdidload中的名称..但是，发生的事情是，只有第一个选择剂量任何东西..所以你总是会看到你选择的第一个图像..所以，如果你选择图像两个你选择的每个其他图像将显示图像二..

an Ÿ帮助会很好。

这里是parentview小区选择是什么样子

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //Sets the back button for the new view that loads (this overrides the usual parentview name with "Back") 
    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil]; 

    if (!self.detailViewController) { 
     self.detailViewController = [[ICDDetailViewController alloc] initWithNibName:@"ICDDetailViewController" bundle:nil]; 

     if (indexPath.section == 0) { 
      _detailViewController.imageName = @"one"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 1) { 
      _detailViewController.imageName = @"two"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 2) { 
      _detailViewController.imageName = @"three"; 
      //  NSLog(@"%@", indexPath); 
     } 
    } 
    [self.navigationController pushViewController:self.detailViewController animated:YES]; 

} 

Answer 1

请勿使用myImageName == @“three”。有一种比较字符串的特殊方法。

试试这个：

if ([myImageName isEqualToString:@"three"]) { 
    [image setImage:[UIImage imageNamed:myImageName]]; 
} 

如果有一个文件扩展名，这样做：

NSString *imagePath = [NSString stringWithFormat:@"%@.png",myImageName]; 
[image setImage:[UIImage imageNamed:imagePath]]; 

顺便说一句，你仍然张贴的旧代码，你在你的另一个问题了。您将您的detailView保留在原始类中，而不是释放并创建新实例。取出if（！detailView）语句。

更新：唯一的其他选择是从大的if（）块中取出分配。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //Sets the back button for the new view that loads (this overrides the usual parentview name with "Back") 
    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil]; 

    if (!self.detailViewController) { 
     self.detailViewController = [[ICDDetailViewController alloc] initWithNibName:@"ICDDetailViewController" bundle:nil]; 


    //MY CHANGES HERE: 
    //If you left these if() statements inside the original code, they would never 
    //fire if the detailView was already instantiated once. Does this make sense? 
    } // <--- moved the bracket up here 
     if (indexPath.section == 0) { 
      _detailViewController.imageName = @"one"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 1) { 
      _detailViewController.imageName = @"two"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 2) { 
      _detailViewController.imageName = @"three"; 
      //  NSLog(@"%@", indexPath); 
     } 
    //} <--- commented this one out 
    [self.navigationController pushViewController:self.detailViewController animated:YES]; 

} 

唯一的另一种方法是这样的：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //Sets the back button for the new view that loads (this overrides the usual parentview name with "Back") 
    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil]; 
    //commented out the next line, don't need to check to see if it's already present 
    //just create a new instance to push on the stack 
    //if (!self.detailViewController) { 
     self.detailViewController = [[ICDDetailViewController alloc] initWithNibName:@"ICDDetailViewController" bundle:nil]; 

     if (indexPath.section == 0) { 
      _detailViewController.imageName = @"one"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 1) { 
      _detailViewController.imageName = @"two"; 
      //  NSLog(@"%@", indexPath); 
     } 
     if (indexPath.section == 2) { 
      _detailViewController.imageName = @"three"; 
      //  NSLog(@"%@", indexPath); 
     } 
    //} <--- get rid of this bracket since the original if() was commented out 
    [self.navigationController pushViewController:self.detailViewController animated:YES]; 

} 

Answer 2

这听起来像你是不是曾经释放你的UIScrollView的实例。所以，当你第二次重用它时，viewDidLoad不会再被调用。这意味着你的'图像'变量永远不会被重新分配一个新的图像。

要检查是否属实，请尝试在您的viewDidLoad方法中放入NSLog调用，并查看它是否在第二次从tableViewCell中选择时调用。

如果是这种情况，有几个选项可以修复它。你在使用ARC吗？

Answer 3

您是否尝试过更新UIImageView？

- (void)loadImage:(NSString *)myImageName 
{ 
    if (myImageName == @"one") { 
     imageName = myImageName; 
    } 
    if (myImageName == @"two") { 
     imageName = myImageName; 
    } 
    if (myImageName == @"three") { 
     imageName = myImageName; 
    } 

    [image setImage:[UIImage imageNamed:imageName]; 
}