iphone - UItableViewCell 中的 uibutton 问题

Question

在我的应用程序中，我使用的是自定义表格。每个单元格都有一个 uibutton 和 uiimage。当按钮上发生触摸时，我想调用 uiimagepickercontroller 方法从 iphone 库中选择图片并将其显示在 ImageView 中。我已经写了它，但收到警告...“customCell”可能不会响应动画的presentmodalviewcontroller...这里customCell是我的主类myApp的子类，也是自定义单元格的 Nib 的名称。有谁知道这个问题吗？？？？ 谢谢...

编辑

- (IBAction)selectExistingPicture1 { 
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self; 
        picker.allowsImageEditing = YES;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:picker animated:YES];
        [picker release];
    } 
    else { 
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error accessing photo library" message:@"Device does not support a photo library" delegate:nil cancelButtonTitle:@"Drat!" otherButtonTitles:nil]; 
        [alert show]; 
        [alert release]; 
    } 
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {    
    CGSize newSize = CGSizeMake(80, 80);
    UIGraphicsBeginImageContext( newSize );
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    imageView.image = newImage;

    [picker dismissModalViewControllerAnimated:YES]; //warning shown here   
}  

这是自定义单元类..并且viewController类有...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     static NSString *CustomCellIdentifier = @"CustomCellIdentifier";
     CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];

     if (cell == nil) {
         NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:nil options:nil];
         for (id currentObject in nib){
             if ([currentObject isKindOfClass:[CustomCell class]]){
                 cell = (CustomCell *)currentObject; break;
             }
         }
     }

     NSUInteger s= indexPath.section;
     //[cell setText:[NSString stringWithFormat:@"I am cell %d", indexPath.row]];

     NSUInteger r = indexPath.row;
      cell.imageView.image = nil;
     for (s;s==0;s++)
     for(r;r==0;r++)
     {       
          UIImage *img=imageView.image;
         cell.imageView.image = img;
         }
     return cell;
 } 

Answer 1

UITableViewCell 不响应 -presentModalViewController:animated:。

您可以为 CustomCell 提供一个指向 View Controller 的指针，然后在 View Controller 上调用 -presentModelViewController:animated: 。

将实例变量添加到您的自定义单元类:

@interface CustomCell : UITableViewCell {
    UIViewController *viewController;
}
@property (nonatomic, assign) UIViewController *viewController;
@end

在-tableView:cellForRowAtIndexPath:中，创建新的CustomCell后，设置属性:

if (cell == nil) {
    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:nil options:nil];
    for (id currentObject in nib){
        if ([currentObject isKindOfClass:[CustomCell class]]){
            cell = (CustomCell *)currentObject;
            cell.viewController = self; // <-- add this
            break;
        }
    }
}

然后，在您的 CustomCell 类中，替换

[self presentModalViewController:picker animated:YES];

与

[self.viewController presentModalViewController:picker animated:YES];