How to force reload of a subview when a button is clicked.

[rsheyeah hussain]

I want to force reload of the subview so I can display all the selected images.?




On clicking the Select All button, I would like to be able to reload the entire view and pass in a boolean value that lets me display a tick mark over all the images.

How do I achieve this.

Here is my code snippets:

    

In AlbumPicker.m:

 

//Create a button
    UIBarButtonItem *infoButton = [[UIBarButtonItem alloc]
                                   initWithTitle:@"Select All"
                                   style:UIBarButtonItemStyleBordered
                                   target:self
                                   action:@selector(selectall_clicked:)];
   
    // flex item used to separate the left groups items and right grouped items
    UIBarButtonItem *flexItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                                                              target:nil
                                                                              action:nil];
    [toolbar setItems:[NSArray arrayWithObjects:flexItem,infoButton,nil]];
   
   
   
    //Add the toolbar as a subview to the navigation controller.
    [self.navigationController.view addSubview:toolbar];
   
    [flexItem release];
    [infoButton release];

 

- (void) selectall_clicked:(id)sender {
   
     // todo: select all
    NSLog(@"Select All Clicked %@",sender);
    NSLog(@"inside for loop of assets - All Clicked ");
   
    [self performSelectorInBackground:@selector(preparePhotos) withObject:nil];
   
    // reload the view -preparePhotos
    AssetTablePicker *my_asset_table_picker = [[AssetTablePicker alloc]init];
    [my_asset_table_picker preparePhotos:];

 

// I have checked the logs, on calling preparePhotos again, the code does not go inside the " if(result != nil) {" if statement", hence how do I force the reload of this view again.
    
}

 

In AssetTablePicker.m:

 

 

-(void)preparePhotos{
   
    printf("inside AssetTablePicker :: calling preparePhotos");
   
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
   
    void (^assetEnumerator)(struct ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
       
        if(result != nil) {
           
            printf("inside result -AssetTablePicker :: calling preparePhotos");
           
           
            if(![assetURLDictionaries containsObject:[result valueForProperty:ALAssetPropertyURLs]]) {
               
                printf("inside assetURLDictionaries -AssetTablePicker :: calling preparePhotos");
               
               
                if(![[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo]) {
                   
                    printf("inside if(![[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo]) -AssetTablePicker :: calling preparePhotos");
                   
                    [assetURLDictionaries addObject:[result valueForProperty:ALAssetPropertyURLs]];
                   
                   Asset *asset = [[Asset alloc] initWithAsset:result checked:YES]; // the setHidden value will now be true and the overlay image will not be displayed
                   // Asset *asset = [[Asset alloc] initWithAsset:result checked:NO]; // the setHidden value will now be false and the overlay image will  be displayed, hence //all the images will by default be checked, when the image is loaded. I want to be able to toggle this value on toggling of the Select ALL button. How do I achieve this?

                    //NSString *checkedValue = _checked;
                    //NSLog(" inside AssetTablePicker :: calling preparePhotos checked value %@",_checked);
                    [assets addObject:asset];
                }
            }
        }
    };
   
    assets = [[NSMutableArray alloc] init];
    assetURLDictionaries = [[NSMutableArray alloc] init];
   
    [assetGroup enumerateAssetsUsingBlock:assetEnumerator];
   
    [self.tableView reloadData];
    [self.navigationItem setTitle:@"Pick Photos"];
   
    [pool release];
}

 

 

 

-(void)dismiss_AssetTable:(id)sender {
   
    printf("inside AssetTablePicker :: you pressed dismiss:doneButtonItem");
   
    [self dismissModalViewControllerAnimated:YES]; //modified by rsheyeah
   
    NSMutableArray *selectedAssetsImages = [[NSMutableArray alloc] init];
   
    for(Asset *asset in assets) {
       
        if([asset selected]) {
           
            [selectedAssetsImages addObject:[asset asset]];
            NSLog (@"selectedAssetsImages = %@", selectedAssetsImages);

 

        }
    }
   
    [(AlbumPickerC*)parent selectedAssets:[NSArray arrayWithArray:selectedAssetsImages]];
}

 

In Asset.m:


@implementation Asset

 

@synthesize asset;
@synthesize parent;
@synthesize checked;

 

- (id)initWithFrame:(CGRect)frame {
    if ((self = [super initWithFrame:frame])) {
        // Initialization code
    }
    return self;
}

 

-(id)initWithAsset:(ALAsset*)_asset checked:(BOOL)_checked {
   
    if (self = [super initWithFrame:CGRectMake(0, 0, 0, 0)]) {
       
        NSLog (@"inside initWithAsset");
       
       
        NSString *checkedValue=_checked ? @"YES" : @"NO";
        NSLog(@" initWithAsset checkedValue %@", checkedValue);
       
        asset = _asset;
        [asset retain];
       
        [self setChecked:_checked];
       
        CGRect viewFrames = CGRectMake(0, 0, 75, 75);
       
        UIImageView *assetImageView = [[UIImageView alloc] initWithFrame:viewFrames];
        [assetImageView setContentMode:UIViewContentModeScaleToFill];
        [assetImageView setImage:[UIImage imageWithCGImage:[asset thumbnail]]];
       
        [self addSubview:assetImageView];
        [self putTickOnOverlayView:viewFrames checked:_checked];
        [assetImageView release];
       
    }
   
    return self;   
}

 

-(void) putTickOnOverlayView:(CGRect) _viewFrames checked:(BOOL)_checked {
   
    NSLog (@"inside putTickOnOverlayView");
   
    NSString *checkedValue=_checked ? @"YES" : @"NO";
    NSLog(@" putTickOnOverlayView checkedValue %@", checkedValue);
   
    overlayView = [[UIImageView alloc] initWithFrame:_viewFrames];
    [overlayView setImage:[UIImage imageNamed:@"Overlay.png"]];
   
   
    [overlayView setHidden:_checked];
    [self addSubview:overlayView];
}

 

-(void)toggleSelectionAll {
   
    self.checked = !self.checked;
   
    NSLog (@"---------------------------------inside toggleSelectionAll");
    //overlayView.hidden=YES;
    NSString *checkedValue=overlayView.hidden ? @"YES" : @"NO";
    NSLog(@"checkedValue %@", checkedValue);
   
    //overlayView.hidden = !overlayView.hidden;
    //NSLog(@"%@", overlayView.hidden ? @"YES" : @"NO");

 

   
   
   
}

 

 

 

-(void)toggleSelection {
   
    NSLog (@"inside toggleSelection");
    NSLog(@"%@", overlayView.hidden ? @"YES" : @"NO");
   
   
    overlayView.hidden = !overlayView.hidden;
}

 

-(BOOL)selected {
   
    return !overlayView.hidden;
}

 

In AssetCell.m:

 

-(void)layoutSubviews {
   
    printf(" AssetCell :: layoutSubviews");
   
    CGRect frame = CGRectMake(4, 2, 75, 75);
   
    for(Asset *asset in assets) {
       
        printf(" Asset :: layoutSubviews");
       
        [asset setFrame:frame];
        [asset addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:asset action:@selector(toggleSelection)]];
        [self addSubview:asset];
        frame.origin.x = frame.origin.x + frame.size.width + 4;
        [asset release];

 

       
    }
}

Thanks for your time.

[Mark Spritzler]

Well you can always send a message to set the should update view variable, which is in any UIView object. I forget the exact method call, but you can use XCode and CTRL-. to get a popup of all the methods available to call.

Or you could take a complete different approach where you use either KVO Key Value Observer pattern to the button when touched. Or you could have a UINotification sent and have all the images registered to receive that notification and then update themselves.

I have had buttons change the screens without ever having to send the message that UIView should redisplay. It happens automatically if you change the appearance of any UIView object on the UIScreen.

Mark

[Mark Spritzler]

Yeah, looking at your code in your other post. If you just loop through your assets and call the checked method that you wrote that updates the UIView of that asset, then it should automatically update your screen.

Mark