I am working on iPad app. And I am using 2 tables in one view and images urls are coming from
web services. I am using Apple provided lazy loading for both tables, and there are 2 web-service called for showing the two tables data, one is calling in ViewDidLoad() and second is calling in callback method of first web service. And I am facing problem in this method.
- (void)appImageDidLoad:(NSIndexPath *)indexPath withDataReceived:(NSData*)receivedData
The values for indexpath.row values are changing every time , some time it gives correct value and some time not.
Can anybody please help me for that.
Thanks in advance.
you might have to pass in which tableview also.. you kno how it is passing indexPath to that method.. modify it to pass tableview.. and inside the method.. check which tableView and then get the right data source array for appropriate tableview..
Related
I'm a little confused as to how I should be using didSelectRowAtIndexPath.
Without using datasources (keeping things simple),if you display a list of names with UITableView and all you want to do is select a name and return it to whatever parent view controller created the UITableView list.. what would you do?
I'm used to Windows MFC programming where you have a dialog class and you call DoModal() to display the dialog and then query member variables of that dialog object to get the results.. With iPhone programming I'm confused with the whole paradigm. I push the UITableView into action, but at what point should I try and retrieve the results? pushViewController is asynchronous in nature isn't it? So I can't expect to retrieve results on the line immediately following the pushViewController method?
I'm using NSMutableArrays of NSStrings to keep things simple.
The patter you are going to use is called delegation, what happens is that you call the new ViewController and let it do its work, the function that called this will return normally,
Now you need to implement didSelectRowAtIndexPath and get the selectedRow, after this you will need to return the selected index or value to the original view controller( this will be recieved in another function) please read more about #protocol and delegateion
Summary of the issue:
When I am loading some data into my iPhone application from a webservice, it populates the tableview two times with double number of records. I found that Viewdidload method is called two times causing this issue.
Scenario
From the first view I parse the webservice and collect the data into an array object.
This array object is being used by the second view to populate the tableview.
I am wondering what is behind reloading of the page causing the tableview has double number of records. Hope somebody can give me a hint.
You may want to consider calling applicationDidFinishLaunchingWithOptions in your app delegate, as this is only called during launch.
Thanks for the tips. What I found the issue was the way adding the view. i replaced [self.view addSubview:trlist.view] with [self presentModelViewController:trlist animated:NO]; and now it loads only one time.
I am using XCode 4.0.1. I have to different views with UITableView. Data is coming from server. I am parsing JSON data and displaying it to tableview. I am using reloaddata method to display data on tableview. But mostly It is not displaying anything(It is not calling tableview delegate methods) but sometimes functioning normally. I am calling URL at ViewWillAppear, calling reloaddata on connectiondidfinishloadingdata.
I am experienced programmer for iphone but this is unexpected to me. Any Suggestions. Thanks in advance.
May be you should call your update on the main thread.
I am quite new to Xcode and Json.
In my app, I have navigation through pages via tableviews (drill down). What I want to do now, is to use Json to create my tableviews and then when I select a cell in the uitableview, it will go to a website through the next page via a uiwebview.
How will I do this?
Parse your json using a parser
Create the parsed response as a data model for table view. You can use a Dictionary/array to keep things simple
Implement the tableview delegate methods and get the selected index
On didselectatrowindex method you create a new view, fetch the url from your model and load it into the webview.
I could write some code but thats really too much you are asking for. If you get stuck in any of the steps above, do leave a comment. I will be glad to help you out.
Very new to programming for iOS and Cocoa so please take it easy on me as I try to wrap my brain around the following. I'm trying to display a tableview populated from an XML feed as the opening screen of my app. I've tried to consume the XML from inside my AppDelegate using the ApplicationDidFinishLaunching method (and then making my AppDelegate a delegate for the XML parser which I access using a NSUrlConnection and its delegate methods) but I can't figure out how to take the parsed XML file and pass it to a tableviewcontroller which can then use it as the datasource for a tableview. When I do try, I always get a blank tableview.
I've written the code a few times and nothing seems to work.. I'll post what I have here to show what I've got so far but I'm afraid its mostly vanilla AppDelegate with a few parser methods thrown in.. any pointers in the right direction would be super appreciated.
Thank you in advance!
Hmm, probably a bad idea to do the network call in the AppDelegate. Try to put all that code at the view controller level. Here's a brief structure of what I do (Since it's very similar)
View Controller listens to button events
Use ASIHTTPRequest to talk to your web service. Handles network really well, you can skip the NSURLConnection stuff.
Try to load your data source (an array?) with static values and see if they come up on the table view.
Parse the response from ASIHTTPRequest using NSXMLParser, and load the data you want into the static array you were using. More here.
Call [tableView reloadData] once you're done and the changes will reflect.
Did you specify a UITableViewDataSource for your table view and implement the two required methods?
tableView:cellForRowAtIndexPath:
and
tableView:numberOfRowsInSection:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html
When I get blank tables, this is what it is; I've forgotten to specify the data source