I have an NSString called stringToDisplay, in which i would like to assign a different value if a certain ViewController was visited. How could I set this up? Is this even possible? ...example of what I want:
If ([prevViewController.visited] == Yes)
{
stringToDisplay = value2;
}
Assuming you are using a navigation controller, you can just do:
NSArray *views = self.navigationController.viewControllers;
UIViewController *previous = [views objectAtIndex:[views count]-2];
where [views objectAtIndex:[views count]-1] is the current ViewController;
Related
Okay so I have my ImagePicker all setup and the ALAssetLibrary setup to get the Picture and Title (if it exists for existing pictures or generic text for a new picture) but now I'm trying to figure out if there's a way I can access this information outside of the block call from the assetForURL method. So here's my code just so I can show what's happening (this is in the viewDidLoad method of a screen that is displayed after a picture selection is made)
__block NSString *documentName;
__block UIImage *docImage;
NSURL *resourceURL = [imageInfo objectForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *asset)
{
ALAssetRepresentation *imageRep = [asset defaultRepresentation];
//Get Image
CGImageRef iref = [imageRep fullResolutionImage];
//If image is null then it's a new picture from Camera
if (iref == NULL) {
docImage = [imageInfo objectForKey:UIImagePickerControllerOriginalImage];
documentName = #"New Picture";
}
else {
docImage = [UIImage imageWithCGImage:iref];
documentName = [imageRep filename];
}
};
// get the asset library and fetch the asset based on the ref url (pass in block above)
ALAssetsLibrary *imageAsset = [[ALAssetsLibrary alloc] init];
[imageAsset assetForURL:resourceURL resultBlock:resultblock failureBlock:nil];
Now I want to be able to use the two variables (documentName and docImage) elsewhere in this ViewController (for example if someone wants to change the name of the document before they save it I want to be able to revert back to the default name) but I can't seem to figure out what I need to do so these variables can be used later. Don't know if this makes much sense or not, so if I need to clarify anything else let me know.
Okay so I figured out that the problem wasn't with the code but with my logic on how I was using it. I was trying to do this on the Modal View that was presented after an image was selected instead of just doing this in the ImagePicker screen and then calling the Modal window inside of the result block code.
I have a pickerView in a popOver.
When the user selects a row from the pickerView, it should be stored into a UITextField (subject)
The method i'm having troubles is:
- (void) viewWithPickerController:(ViewWithPickerController*) viewWithPickerController didSelectValue:(NSString*) value
{ NSLog(#"selected value is: %#",value);
subject.text = [NSString stringWithFormat:#"%#",value];
NSLog(#"subject is: %#",subject.text);
}
Where value is the row of the pickerView: it logs the right value but it doesn't set it to the textField subject, which seems to be null.
Where am i wrong?
You need to make sure your "subject" IBOutlet is set.
If you're doing this picker view method before your XIB / view controller is instantiated, that would explain why subject is a nil object.
How else would you be instantiating "subject"?
I search Google to find a good answer but the most tutorials are shown in previous Xcode Versions...
Also, I don't want to drag-n-drop cells from the Interface Builder, but to control the Table View programmatically (from an NSObject subclass file).
What I currently do is this: 1. Create a file named tableController.h that is a subclass of NSObject.
2. I create an NSObject Object in my Nib File (and set it as a subclass of tableController).
3. I drag a Table View to my window.
4. I CTRL+Drag from the Table View to my tableController.h so to create the outlet "tableView"
5. I create these functions in the interface file:
-(int)numberOfRowsInTableView:(NSTableView *)cocoaTV;
-(id)tableView:(NSTableView *)cocoaTV:objectValueForTableCollumn:(NSTableColumn *)tableCollumn row:(int)row;
6. I implement the functions like this:
-(int)numberOfRowsInTableView:(NSTableView *)cocoaTV{
return 5;
}
-(id)tableView:(NSTableView *)cocoaTV:objectValueForTableCollumn:(NSTableColumn *)tableCollumn row:(int)row{
NSArray *tvArray = [[NSArray alloc]initWithObjects:#"1",#"2",#"3",#"4",#"5", nil];
NSString *v = [tvArray objectAtIndex:row];
return v;
}
Then I CTRL+Drag from the Object in the Interface Builder to the Table View to set the dataSource and to set it as delegate.
When I build and Run the App it shows that it has created the 5 Rows but in every cell in every column it says "Table View Cell".
Any help would be appreciated....
-(id)tableView:(NSTableView *)cocoaTV:objectValueForTableCollumn:(NSTableColumn *)tableCollumn row:(int)row is wrong.. i'm not sure how it compiles, to be honest (unless there was an error copy/pasting it). the method should look like:
- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
NSArray *tvArray = [[NSArray alloc]initWithObjects:#"1",#"2",#"3",#"4",#"5", nil];
NSString *v = [tvArray objectAtIndex:row];
return v;
}
I've gotten a checkbox header renderer to work well with flat DPs, but a
hierarchical collection view is another story. On click, I want it to select all
checkboxes in a given column. Here is my code:
var dp:HierarchicalCollectionView = _dataGrid.dataProvider as
HierarchicalCollectionView;
var testDp:GroupingCollection = dp.source as GroupingCollection;
var rawDp:ArrayCollection = testDp.source as ArrayCollection;
for(var i:int=0 ; i < rawDp.length ; i++){
rawDp[i][_dataField] = cb.selected;
}
It selects all checkboxes on the 2nd level of data, but doesn't select the top
level of data. What am I missing here? I can't seem to find it.
Any tips are greatly appreciated. Thank you.
For hierarchical data you have to use a cursor which iterates over all levels of the hierarchical data.
var dp:IHierarchicalCollectionView = _dataGrid.hierarchicalCollectionView;
var cursor:IViewCursor= dp.createCursor();
while (!cursor.afterLast)
{
cursor.current[_dataField] = cb.selected;
cursor.moveNext();
}
Howerver, this works only with nodes that have previously been opened. So either expand all nodes with _dataGrid.expandAll() (you can collapse them afterwards since the nodes only have to be opened once) or iterate your hierarchical data manually:
function setCheckBoxValue(children:ArrayCollection, value:Boolean):void
{
for each (var child:Object in children)
{
if (child.hasOwnProperty("children") && child["children"])
setCheckBoxValue(child["children"], value);
child[_dataField] = value;
}
}
var myDataProvider:HierarchicalData = /* your data provider */;
// Call it like this...
setCheckBoxValue(myDataProvider.source, cb.selected);
Update: To answer your second question...
Create a new CheckBoxColumn which extends AdvancedDataGridColumn. You can use it to preconfigure your headerRenderer and itemRenderer.
In your custom item renderer you get hold of your column like this:grid = AdvancedDataGrid(listData.owner);
column = grid.columns[listData.columnIndex] as CheckBoxColumn;
Do the same in your header renderer.
Whenever the CheckBox value in one of your item renderers changes dispatch a event through your column. Something like: column.dispatchEvent(new Event("checkBoxValueChanged"));
Your header render should add an event listener to the column for the "checkBoxValueChanged" event (or whatever you call it). Whenever that event is fired loop through your data provider and update the headers CheckBox accordingly.
In theory that should work. HTH
I'm modifying the "Edit.aspx" default page template used by ASP.NET Dynamic Data and adding some additional controls. I know that I can find the type of object being edited by looking at DetailsDataSource.GetTable().EntityType, but how can I see the actual object itself? Also, can I change the properties of the object and tell the data context to submit those changes?
Maybe you have found a solution already, however I'd like to share my expresience on this.
It turned out to be a great pita, but I've managed to obtain the editing row. I had to extract the DetailsDataSource WhereParameters and then create a query in runtime.
The code below works for tables with a single primary key. If you have compound keys, I guess, it will require modifications:
Parameter param = null;
foreach(object item in (DetailsDataSource.WhereParameters[0] as DynamicQueryStringParameter).GetWhereParameters(DetailsDataSource)) {
param = (Parameter)item;
break;
}
IQueryable query = DetailsDataSource.GetTable().GetQuery();
ParameterExpression lambdaArgument = Expression.Parameter(query.ElementType, "");
object paramValue = Convert.ChangeType(param.DefaultValue, param.Type);
Expression compareExpr = Expression.Equal(
Expression.Property(lambdaArgument, param.Name),
Expression.Constant(paramValue)
);
Expression lambda = Expression.Lambda(compareExpr, lambdaArgument);
Expression filteredQuery = Expression.Call(typeof(Queryable), "Where", new Type[] { query.ElementType }, query.Expression, lambda);
var WANTED = query.Provider.CreateQuery(filteredQuery).Cast<object>().FirstOrDefault<object>();
If it's a DD object you may be able to use FieldTemplateUserControl.FindFieldTemplate(controlId). Then if you need to you can cast it as an ITextControl to manipulate data.
Otherwise, try using this extension method to find the child control:
public static T FindControl<T>(this Control startingControl, string id) where T : Control
{
T found = startingControl.FindControl(id) as T;
if (found == null)
{
found = FindChildControl<T>(startingControl, id);
}
return found;
}
I found another solution, the other ones did not work.
In my case, I've copied Edit.aspx in /CustomPages/Devices/
Where Devices is the name of the table for which I want this custom behaviour.
Add this in Edit.aspx -> Page_Init()
DetailsDataSource.Selected += entityDataSource_Selected;
Add this in Edit.aspx :
protected void entityDataSource_Selected(object sender, EntityDataSourceSelectedEventArgs e)
{
Device device = e.Results.Cast<Device>().First();
// you have the object/row being edited !
}
Just change Device to your own table name.