I have created the table view using custom nib file in which i have add two images to create view like grid. When i add around 50 rows the app show me the message "memory warning" and then it will crash and Xcode show me the error "Message from debugger: Terminated due to Memory Pressure". I am testing app in iPhone 4s. it also crashes in iPhone 6. I am also using SDWebimage library for loading images. but even after comment the code of set images in "cellForRowAtIndexPath" method it crashes. Here is my code
SingleEventTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"SingleEventTableViewCell"];
if (cell == nil)
{
NSLog(#"cell allocated");
cell = [[SingleEventTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"SingleEventTableViewCell"];
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"SingleEventTableViewCell"
owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.selectionStyle=UITableViewCellSelectionStyleNone;
}
Can anyone suggest me how can I check memory leakage or something to resolve this issue.
Related
I have an app built for iOS 5 that I'm trying to upgrade straight to iOS 7, so this also maybe an issue with iOS 6.
We have a UITextField inside a custom table view cell (class derived from UITableCellView), but tapping on it no longer brings up the keyboard in the simulator. Everything is enabled, and User Interaction Enabled is checked.
It used to work fine in iOS 5.
I'm not sure what code to include, but here's the code that creates the cell... the LoginRegisterTableViewCell just has a 'fieldLabel' (UILabel) and 'userText' (UITextField):
// Login area
static NSString * reuseIdentifier = #"LoginRegisterTableViewCell";
LoginRegisterTableViewCell * cell = (LoginRegisterTableViewCell *)[tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
if(cell == nil)
{
// The official Apple way of loading TableViewCell nibs
// http://www.nomadplanet.fr/2011/01/custom-uitableviewcells-loaded-from-xib-howto-debug/
[[NSBundle mainBundle] loadNibNamed:#"LoginRegisterTableViewCell" owner:self options:nil];
cell = formFieldCell;
self.formFieldCell = nil;
}
cell.delegate = self;
cell.userText.tag = [indexPath row];
I can get the keyboard to come up if I call [userText becomeFirstResponder] when the table cell is selected, but this seems like a workaround as opposed to the correct way.
Try this code with the table view data source: cellForRowAtIndexPath
NSString *cellReuseIdentifier = #"CellIdentifier";
UINib *nib = [UINib nibWithNibName:#"CustomTableViewCell" bundle:nil];
[_myTableView registerNib:nib forCellReuseIdentifier:cellReuseIdentifier];
CustomTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellReuseIdentifier];
if (!cell)
{
cell = [[CustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellReuseIdentifier];
}
return cell;
It is working for me with the custom cell created with the xib as shown in the image
Note: Mark Also create XIB file.
And give a cell reuse identifier like
This is working for me well for the sample application with no issue with the keyboard.
I am using the same code in two of my view controllers (they are implementing the same class what changes is the url they download) and in one occassion the image is displayed correclty while in the other I do see an empty cell.
Here is my code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier=#"MyCell";
//this is the identifier of the custom cell
MyCell *cell = (MyCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
tableView.backgroundColor=[UIColor clearColor];
tableView.opaque=NO;
tableView.backgroundView=nil;
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"MyCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
NSLog(#"Image url is:%#",[images_url objectAtIndex:indexPath.row]);
NSURL *url_image=[NSURL URLWithString:[images_url objectAtIndex:indexPath.row]];
cell.myimage.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:url_image]];
return cell;
}
As i told you I have 2 view controllers implementing the same class. In the view did load the url is set depending on the value of a flag. If I open controller A, I see no image, if I open view B i can see the image. Both of the urls are correct as I can check it with the NSLog I have inserted.
What might be the problem?
Unfortunately calling "NSData dataWithContentsOfURL" is a blocking call. Execution of your program will stop until iOS is able to fetch all the data from the server or fails trying. This may often be "fast" if you're on LTE or WiFi; but can potentially take a LONG time.
Meanwhile, you're on the "main thread" in your app - so your app will appear to freeze-up, and the system's watchdog timer may kill your app. If anyone besides you will use this ap, you absolutely need to populate your tableview cell's image with local data that's retrieved immediately or use asynchronous methods.
Just google for "lazy load UIImage". This SO question has some good tips on the subject:
lazy-load-images-in-uitableview
Additionally, you should move these lines to some setup code. You don't need to perform them every time to update a cell:
tableView.backgroundColor=[UIColor clearColor];
tableView.opaque=NO;
tableView.backgroundView=nil;
Best of luck!
I have a custom cell that has a button on it. I would like to experiment with using a long press instead.
The code that creates the cell looks like this:
CustomCell *cell = (CustomCell *)[aTableView dequeueReusableCellWithIdentifier:#"CustomCell"];
if (!cell)
{
cell = [[[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:self options:nil] lastObject];
}
(etc)
So I did this:
CustomCell *cell = (CustomCell *)[aTableView dequeueReusableCellWithIdentifier:#"CustomCell"];
if (!cell)
{
// cell = [[[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:self options:nil] lastObject];
cell = [[[NSBundle mainBundle] loadNibNamed:#"CustomCellDwellToSpeak" owner:self options:nil] lastObject];
}
Then I made a copy of the original xib. Deleted the button. Dropped an UILongPressGestureRecognizer on the cell, and created a target by control-dragging form the recognizer to the file's owner:
- (IBAction)longPress:(UILongPressGestureRecognizer *)sender;
However, once I start generating cells, I get this error:
TypOHD[41541:c07] -[UILongPressGestureRecognizer label]: unrecognized selector sent to instance 0x17d0be60
What's up with that?
I never got or found an answer to the question as such. What I did learn was that this plan is potentially flawed. Apparently mixing your won gesture recognizers in with the table view is a recipe for disaster, or at least heartbreak.
I my case, I decided to go with a fixed layout that consisted of just the number of items that would be shown anyway. In my app I was really only using a table for historical reasons anyway, and never needed to display more than 7 items.
A workaround and a hack, but it worked for me.
I have been testing the application on the device (iOS 5) while using Instruments and I found a couple of memory leaks.
This is the part of the code I'm being redirected to from Instruments (see the arrow for exact line):
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
CeldaUltimasFotosViewCell *cell =
(CeldaUltimasFotosViewCell *) [self.tableView
dequeueReusableCellWithIdentifier:#"CeldaUltimasFotosViewCell"];
if (cell == nil) {
- - - - > NSArray *topLevelObjects =
[[NSBundle mainBundle]
loadNibNamed:#"CeldaUltimasFotosViewCell"
owner:nil options:nil];
cell = [topLevelObjects objectAtIndex:0];
}
// Configure the cell...
[[cell titulo] setFont:fuente_titulo];
...
return cell;
}
As you can see, I have a custom cell which is loaded from a NIB file. There are three files for the cell (customCell.m, customCell.h, customCell.xib). The thing is that I don't know if I have to release something in the cell controller (which is now empty, no methods), since this is iOS 5 with ARC.
check out my answer here:
How can I recycle UITableViewCell objects created from a XIB?
you don't even need to use loadNibNamed any more on iOS5
Take a look at the Table View Programming and how to load cells from NIB (XIB) files.
https://developer.apple.com/library/ios/#documentation/userexperience/conceptual/TableView_iPhone/TableViewCells/TableViewCells.html#//apple_ref/doc/uid/TP40007451-CH7-SW1
The first thing weird is that you are storing the cell in a local variable. You should be wiring the custom cell up to a property in the class and all you call in your code is:
[[NSBundle mainBundle] loadNibNamed:#"CeldaUltimasFotosViewCell" owner:self options:nil];
Follow the code from Loading Custom Table-View Cells From Nib Files and you can't go wrong.
I have an app, and I'd need custom UITableViewCells, I've been trying different ways, but no one works for what I want, or simply don't work. Can someone guide me how can I do it? Actually the cell, needs to have some UIImageViews and an UILabel and a UITextView. Thanks in advance!
Create a NIB file with a single UITableViewCell in it.
Loading the cell from the nib is a two liner:
NSArray* objects = [[NSBundle mainBundle] loadNibNamed:#"TheFile"
owner:nil
options:nil];
UITableViewCell* cell = [objects objectAtIndex:0];
This method will allways access disk when used, so it can be slow. On iOS 4 and later the is a better help class that caches the NIB in memory, for faster creation. Use like this:
// Cache this one!
UINib* nib = [UINib nibWithNibName:#"TheFile" bundle:nil];
// Then do:
NSArray* objects = [nib instantiateWithOwner:nil
options:nil];
UITableViewCell* cell = [objects objectAtIndex:0];