Im wanting to create a generic dropdown control for my IPad app. Basically when the user clicks on a textfield a popover control will show and list items. The users can keep typing in the textfield which will filter the items in the dropdown popover control.
Has anyone got any advice or know of any examples on accomplishing this?
Basically it will be like the "Suggestions" popover list in the App store search field of the ipad.
Thanks in advance
Well, I would accomplish this by loading a TableViewController into the PopoverController and make its interface available to the ViewController (the one that has the textfield in it).
In the TableViewController I would load a dictionary/array of items. Whenever a user enters text in the textfield (you can respond on this trough events in your Interface Builder) I would then call a function in the TableViewController that updates the list that is displayed (e.g. displays all dictionary items that start with the entered text).
Whenever someone clicks on a item in TableViewController, you can then call a function in the ViewController.
I can't give you a code sample, since that would require quite some time to create :P.
I hope this helps you.
Related
In the current project,I am using an UIViewController with 2 text Fields and a text area.
Text fields are used as drop-down (custom logic) and based on drop-down selection information is displayed in text area for e.g. State and city are two drop down. On click of State drop down city data is populated in second drop down and on selection of city corresponding info is fetch and displayed in Text-area.
I have a requirement to move this logic to custom popup. Can anyone guide me how to achieve this with minimal changes in Xamarin iOS.
It would use UIPopoverController in this care. You already have a view controller with all the UI elements. You can use it as the DetailViewController so you don't have to change that much. Only it's size and the background. You can use it for both iPhones and iPads.
Here you have a sample project with source code:
https://developer.xamarin.com/samples/monotouch/Popovers/
Create a new UIViewcontroller in the storyboard, set the background colour of the main view to transparent, then create another view on top of that and put in any controls you want to display etc. then in the UIViewcontrollers init method add in the following:
public OverlayView(IntPtr handle) : base (handle)
{
ModalPresentationStyle = UIModalPresentationStyle.OverCurrentContext;
}
That way the background view that you've set as transparent won't just show black, it'll show in the context of the screen that called it, then you just present it as you would any other view, and add in some dismiss action events if you want it to pass data back etc. Hope this helps.
I'm trying to add an activity indicator when a user clicks on my tab bar menu but it seems complicated actually.
I have 4 tab bar items and they parse a json from an URL. My problem is when the user clicks on tab bar item and the screen just freezes before show the next view. I would like to change to the view and then show an activity indicator while they make the url petition and parse the item.
I have one class that conform the UITabBarController method, but I'm reading some exemples in Objective-C that they talk about UITabBarDelegate.
How can I try to solve this? I really appreciate your help, thanks!
I had a question previously that died out and wanted to post a different approach and see if it was possible.
I have a working application that has a UITabBarController that controls 4 distinct UIViewControllers. I am able to navigate fine through these, but a couple of the loaded views need to load others in order to perform actions.
Is it possible to have a button within a UIViewController that will replace the current view with a different one and still maintain the tab bar on the bottom? possible replacing the current view and advising either the new UIViewController or the owner tabBarController that the relationship is still the same?
I can post code and further clarify if you wish. I am VERY new to XCode so i'm not completely familiar with how everything operates as of yet.
thank you in advance,
Silver Tiger
Yes you can add new view to one existed in the tab.
For example, if your view controller in tab is of type navigation based then you can push the other view upon certain event.
I got an application which has a NSToolbar in its main window. Depending on which icon is clicked a NSView is displayed in this window. My problem is, that one of these views shows data in a NSTableView that I want to be reloaded each time the view is visible. Since -init is only called once, I don't know how to do that.
(example: When the application starts it shows the Documents section [on of the sub views of the window]. Now when I click on Employees [which displays another sub view instead of the first one] and then on Documents again, I want the data in Documents' NSTableView to reload.)
How do I do that?
Thanks in advance.
I got an application which has a NSToolbar in its main window. Depending on which icon is clicked a NSView is displayed in this window.
Use a tab view. You can hide the tabs, then implement your action methods for the toolbar items to act as the tabs, changing the selected tab view item to whichever one corresponds to the pressed toolbar item.
Now when I click on Employees [which displays another sub view instead of the first one] and then on Documents again, I want the data in Documents' NSTableView to reload.
Why? Why not reload it only when the data changes?
You don't have to hold NSTableView's hand; if it needs the data from you again, it'll ask you for it again.
And if you're concerned about reloading the data while the view is not visible, that's premature optimization. Don't worry about it until you prove via profiling that it is a real performance problem.
I have been trying this for past few days but couldnt figure it out.
I have an application which has a NSOutlineView and a NSTableView. Outlineview takes input a path and displays them in the form of a tree structure its sub contents. So when ever a user clicks on a particular folder in the outine view, the contents of the folder should be displayed in the table view with their attributes in the form of a list.
Now i am able to display in both the views respective contents and the interaction between the outlineview and tableview is done using delegates and notifications.
Now my problem is I want to have mouse events to be detected in both the views so that i can make my app more interactive by enabling single click to select, double click to enable opening the file/folder and control+click to enable a contextual pop up menu. but strangely no mouse events are getting detected.
my design of the app is pretty simple with each of table and outline views having their own view and controller class and interactions between them using notifications. Please can you guys suggest me where i am going wrong?
I know i can get single click and double click to work using setAction and DoubleAction methods of table view but i cannot get control click to work. I want to know whats wrong with my app design as non of my views are detecting mouse events :(
Thanks
You can get whether Control is pressed with:
if([[NSApp currentEvent] modifierFlags] & NSControlKeyMask){
//control was pressed at the time the event was posted
}
Or you might want to subclass the NSTableView/NSOutlineView and override mouseDown: to get the event directly.
Also, if your action and doubleAction aren't working, verify that the target/action are correct with something like:
NSAssert([[theView target] respondsToSelector:[theView doubleAction]], #"target/action is wrong");