I am getting a crash randomly when I select a cell in a UITableView in a viewcontroller in my project.
I think the problem is caused by the cells I am trying to reuse.
Here is the code.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
[self reinitializeStrArray];
static NSString *CellIdentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [strArray objectAtIndex:indexPath.row];
return cell;
}
- (void)addStrTableToSubView{
strTable = [[UITableView alloc] initWithFrame:CGRectMake(20, 110, 280, 285)];
[strTable setDelegate:self];
[strTable setDataSource:self];
[self.view addSubview:strTable];
UILabel *label = [[[UILabel alloc] initWithFrame:CGRectMake(20, 83, 280, 28)] autorelease];
UIColor *myColor = [UIColor colorWithRed:(215 / 255.0) green:(145 / 255.0) blue:(0.0 / 255.0) alpha: 1];
label.backgroundColor = myColor;
label.font = [UIFont boldSystemFontOfSize:24];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.8];
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.text = [#"strings" capitalizedString];
[self.view addSubview:label];
[strTable selectRowAtIndexPath:scrollStrIndexPath animated:YES scrollPosition:UITableViewScrollPositionTop];
}
I create my table in XCode. So there is no UITableViewCell object in IB which has an identifier.
Is it possible to add this in code while creating the table?
Or is the problem somewhere else?
Thanks
When you get a EXC_BAD_ACCESS, usually means that there is an incorrect memory management (i.e. an object was improperly released). My suggestion is to enable the NSZombieEnabled environment variable: it will give you more information about what is the object that causes the problem. More info here.
Related
I'm absolutely stumped on how to fix this issue.
So I have a UITableView and in the delegate method cellForRowAtIndex: I'm adding several subviews to each cell if the cell is nil (the initial building of the table view). Everything works well and the table view is built, however, when I scroll down a little in the application, the app all of a sudden crashes with SIGBART and gives me the error
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSIndexPath setImage:]: unrecognized selector sent to class 0x3c361e68'** It's weird because I'm not even calling a setImage method anywhere in my code.
Here is the code for the delegate method.
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UIImageView* imageView;
UILabel* ttitle;
UILabel* ttitle2;
UILabel* ttitle3;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// Configure cell:
// *** This section should configure the cell to a state independent of
// whatever row or section the cell is in, since it is only executed
// once when the cell is first created.
imageView=[[UIImageView alloc]initWithFrame:CGRectMake(10.0, 11.0, 50.0, 50.0)];
[imageView setContentMode:UIViewContentModeScaleAspectFill];
imageView.layer.masksToBounds=YES;
imageView.layer.cornerRadius=5.0;
[cell.contentView addSubview:imageView];
ttitle = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 7.0, 200, 20)] autorelease];
ttitle.textColor= [UIColor blackColor];
ttitle.numberOfLines=1;
ttitle.backgroundColor=[UIColor clearColor];
ttitle.font=[UIFont fontWithName:#"Arial Bold" size:15.0];
[cell.contentView addSubview:ttitle];
if (indexPath.row==0) {
CGSize size=[[[data objectAtIndex:indexPath.row] valueForKey:#"content"] sizeWithFont:[UIFont systemFontOfSize:14.0f] constrainedToSize:CGSizeMake(265.0f, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
ttitle2 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 27.5, 200, size.height)] autorelease];
ttitle2.textColor= [UIColor darkGrayColor];
ttitle2.backgroundColor=[UIColor clearColor];
ttitle2.numberOfLines=0;
ttitle2.textAlignment = NSTextAlignmentLeft;
ttitle2.lineBreakMode=NSLineBreakByWordWrapping;
ttitle2.font=[UIFont fontWithName:#"Arial" size:14.0];
[cell.contentView addSubview:ttitle2];
ttitle3 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, ttitle2.frame.origin.y+ttitle2.frame.size.height-8.0, 210, 40)] autorelease];
ttitle3.textColor= [UIColor darkGrayColor];
ttitle3.backgroundColor=[UIColor clearColor];
ttitle3.numberOfLines=1;
ttitle3.textAlignment = NSTextAlignmentLeft;
ttitle3.lineBreakMode=NSLineBreakByWordWrapping;
ttitle3.font=[UIFont fontWithName:#"Arial" size:11.0];
[cell.contentView addSubview:ttitle3];
}
else{
CGSize size=[[[data objectAtIndex:indexPath.row] valueForKey:#"content"] sizeWithFont:[UIFont systemFontOfSize:14.0f] constrainedToSize:CGSizeMake(265.0f, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
ttitle2 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 27.0, 200, size.height)] autorelease];
ttitle2.textColor= [UIColor darkGrayColor];
ttitle2.backgroundColor=[UIColor clearColor];
ttitle2.numberOfLines=0;
ttitle2.textAlignment = NSTextAlignmentLeft;
ttitle2.lineBreakMode=NSLineBreakByWordWrapping;
ttitle2.font=[UIFont fontWithName:#"Arial" size:14.0];
[cell.contentView addSubview:ttitle2];
ttitle3 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, ttitle2.frame.origin.y+ttitle2.frame.size.height-9.0, 210, 40)] autorelease];
ttitle3.textColor= [UIColor darkGrayColor];
ttitle3.backgroundColor=[UIColor clearColor];
ttitle3.numberOfLines=1;
ttitle3.textAlignment = NSTextAlignmentLeft;
ttitle3.lineBreakMode=NSLineBreakByWordWrapping;
ttitle3.font=[UIFont fontWithName:#"Arial" size:11.0];
[cell.contentView addSubview:ttitle3];
}
}
// Customize cell:
// *** This section should customize the cell depending on what row or section
// is passed in indexPath, since this is executed every time this delegate method
// is called.
imageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[data objectAtIndex:indexPath.row] valueForKey:#"thumbnail"]]]];
[ttitle setText:[[data objectAtIndex:indexPath.row] valueForKey:#"name"]];
[ttitle2 setText:[[data objectAtIndex:indexPath.row] valueForKey:#"content"]];
NSString* first=[[[data objectAtIndex:indexPath.row] valueForKey:#"hashtag"] stringByAppendingString:#" "];
NSString* second =[first stringByAppendingString:[[data objectAtIndex:indexPath.row] valueForKey:#"place"]];
NSString* third=[second stringByAppendingString:#" "];
NSString* fourth=[third stringByAppendingString:#"¤ "];
NSString* conversion=[[[data objectAtIndex:indexPath.row] valueForKey:#"counter"] stringValue];
NSString* fifth=[fourth stringByAppendingString:conversion];
[ttitle3 setText:fifth];
return cell;
}
Appreciate the help guys!
*UPDATED CODE
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UIImageView* imageView;
UILabel* ttitle;
UILabel* ttitle2;
UILabel* ttitle3;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
// Configure cell:
// *** This section should configure the cell to a state independent of
// whatever row or section the cell is in, since it is only executed
// once when the cell is first created.
imageView=[[UIImageView alloc]initWithFrame:CGRectMake(10.0, 11.0, 50.0, 50.0)];
[imageView setContentMode:UIViewContentModeScaleAspectFill];
imageView.layer.masksToBounds=YES;
imageView.layer.cornerRadius=5.0;
imageView.tag=1;
[cell.contentView addSubview:imageView];
ttitle = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 7.0, 200, 20)] autorelease];
ttitle.textColor= [UIColor blackColor];
ttitle.numberOfLines=1;
ttitle.tag=69;
ttitle.backgroundColor=[UIColor clearColor];
ttitle.font=[UIFont fontWithName:#"Arial Bold" size:15.0];
[cell.contentView addSubview:ttitle];
if (indexPath.row==0) {
CGSize size=[[[data objectAtIndex:indexPath.row] valueForKey:#"content"] sizeWithFont:[UIFont systemFontOfSize:14.0f] constrainedToSize:CGSizeMake(265.0f, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
ttitle2 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 27.5, 200, size.height)] autorelease];
ttitle2.textColor= [UIColor darkGrayColor];
ttitle2.backgroundColor=[UIColor clearColor];
ttitle2.numberOfLines=0;
ttitle2.tag=70;
ttitle2.textAlignment = NSTextAlignmentLeft;
ttitle2.lineBreakMode=NSLineBreakByWordWrapping;
ttitle2.font=[UIFont fontWithName:#"Arial" size:14.0];
[cell.contentView addSubview:ttitle2];
ttitle3 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, ttitle2.frame.origin.y+ttitle2.frame.size.height-8.0, 210, 40)] autorelease];
ttitle3.textColor= [UIColor darkGrayColor];
ttitle3.backgroundColor=[UIColor clearColor];
ttitle3.numberOfLines=1;
ttitle3.tag=71;
ttitle3.textAlignment = NSTextAlignmentLeft;
ttitle3.lineBreakMode=NSLineBreakByWordWrapping;
ttitle3.font=[UIFont fontWithName:#"Arial" size:11.0];
[cell.contentView addSubview:ttitle3];
}
else{
CGSize size=[[[data objectAtIndex:indexPath.row] valueForKey:#"content"] sizeWithFont:[UIFont systemFontOfSize:14.0f] constrainedToSize:CGSizeMake(265.0f, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
ttitle2 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, 27.0, 200, size.height)] autorelease];
ttitle2.textColor= [UIColor darkGrayColor];
ttitle2.backgroundColor=[UIColor clearColor];
ttitle2.numberOfLines=0;
ttitle2.tag=70;
ttitle2.textAlignment = NSTextAlignmentLeft;
ttitle2.lineBreakMode=NSLineBreakByWordWrapping;
ttitle2.font=[UIFont fontWithName:#"Arial" size:14.0];
[cell.contentView addSubview:ttitle2];
ttitle3 = [[[UILabel alloc] initWithFrame:CGRectMake(70.0, ttitle2.frame.origin.y+ttitle2.frame.size.height-9.0, 210, 40)] autorelease];
ttitle3.textColor= [UIColor darkGrayColor];
ttitle3.backgroundColor=[UIColor clearColor];
ttitle3.numberOfLines=1;
ttitle3.tag=71;
ttitle3.textAlignment = NSTextAlignmentLeft;
ttitle3.lineBreakMode=NSLineBreakByWordWrapping;
ttitle3.font=[UIFont fontWithName:#"Arial" size:11.0];
[cell.contentView addSubview:ttitle3];
}
imageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[data objectAtIndex:indexPath.row] valueForKey:#"thumbnail"]]]];
[ttitle setText:[[data objectAtIndex:indexPath.row] valueForKey:#"name"]];
[ttitle2 setText:[[data objectAtIndex:indexPath.row] valueForKey:#"content"]];
NSString* first=[[[data objectAtIndex:indexPath.row] valueForKey:#"hashtag"] stringByAppendingString:#" "];
NSString* second =[first stringByAppendingString:[[data objectAtIndex:indexPath.row] valueForKey:#"place"]];
NSString* third=[second stringByAppendingString:#" "];
NSString* fourth=[third stringByAppendingString:#"¤ "];
NSString* conversion=[[[data objectAtIndex:indexPath.row] valueForKey:#"counter"] stringValue];
NSString* fifth=[fourth stringByAppendingString:conversion];
[ttitle3 setText:fifth];
}
else {
imageView =[cell viewWithTag:1];
ttitle=[cell viewWithTag:69];
ttitle2=[cell viewWithTag:70];
ttitle3=[cell viewWithTag:71];
}
//STUFFOUTSIDE
// Customize cell:
// *** This section should customize the cell depending on what row or section
// is passed in indexPath, since this is executed every time this delegate method
// is called.
return cell;
}
The problem is that your local variables are not being initialized when the cell is re-used. Here's the current flow for imageView:
UIImageView* imageView;
if (cell == nil)
{
// Create imageView
imageView=...
}
// If cell is being reused (ie cell is not nil) then imageView is nil at this point.
imageView.image=...
When you are reusing a table view cell, tableView:dequeueReusableCellWithIdentifier: returns an actual cell instead of nil and the initialization of imageView is skipped.
You need to "find" the imageView that is in the reused cell in order to make changes to it.
Therefore, I suggest that you modify your logic like this:
UIImageView* imageView;
if (cell == nil)
{
// Create imageView
imageView=...
}
else
{
imageView = // get a reference to the imageView
}
imageView.image=...
So now, of course, the question is "how?".
A very common way is to set the tag of the view when you create it so that you can easily retrieve it at a later time. You would use this technique like this:
// Use a unique tag number for each subview.
#define MY_IMAGEVIEW_TAG 1000
UIImageView* imageView;
if (cell == nil)
{
// Create imageView
imageView=... // Same as before
imageView.tag = MY_IMAGEVIEW_TAG;
}
else
{
// This is a cell that is being re-used and was previously created.
// Retrieve a reference to the existing image view that is already in the cell
imageView = [cell viewWithTag:MY_IMAGEVIEW_TAG];
}
// Now imageView is "safe" to use whether it is a new cell or one that is reused!
imageView.image=...
NOTE: If you are doing a lot of this, creating a UITableViewCell subclass that has properties for each of these subviews would make the use of tags and viewWithTag unnecessary, as well as make your code easier to read.
#Inafziger has already posted the correct answer to this question, I just want to explain a little bit more in detail why you're seeing this "weird" crash.
I wouldn't recommend the excessive usage of tags, though. It might be a better idea to create a subclass of UITableViewCell.
You're not initializing your imageView and ttitle variables:
UIImageView *imageView; // imageView can point to anything now!
UILabel* ttitle;
Usually, you'd initialize local variables to nil or 0 (whatever makes sense) when you declare them to avoid such dangling pointers.
Because you're reusing your table view cells cell won't always be nil and your if-clause won't be executed:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) { // Won't be executed if the cell could be dequeued!
...
imageView = ...;
}
Hence, if cell can be dequeued, your imageView and ttitle variables have still not been assigned to anything when you use them!
You're then setting the attributes of the views:
imageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[data objectAtIndex:indexPath.row] valueForKey:#"thumbnail"]]]];
[ttitle setText:[[data objectAtIndex:indexPath.row] valueForKey:#"name"]];
[ttitle2 setText:[[data objectAtIndex:indexPath.row] valueForKey:#"content"]]
imageView.image = ...; is the same as calling [imageView setImage:...];. You can read more about that here: http://www.cocoacast.com/cocoacast/?q=node/103
And that's when all comes together: imageView isn't initialized and you're calling -setImage: on it. Boom, crash!
In your case imageView points to the NSIndexPath class. This could be anything, though.
Because of that you're effectively calling -setImage: on the NSIndexPath class (equivalent to: +[NSIndexPath setImage:]) and the app crashes with the +[NSIndexPath setImage:]: unrecognized selector sent to class 0x3c361e68 error message.
These "pipe" characters are appearing in some of my cells on my table view, but only on iOS 6. The first screenshot shows the issue on iOS 6, and the lower screenshot is iOS 4.3:
I appreciate any help offered.
Here is the code I'm using:
- (UITableViewCell *)tableView:(UITableView *)_tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = [NSString stringWithFormat:#"Cell%d%d", indexPath.section, indexPath.row];
UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
UIView *clearColor = [[UIView alloc] init];
clearColor.backgroundColor = [UIColor clearColor];
cell.selectedBackgroundView = clearColor;
}
UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(10, 10, 243.5, 25)];
[label1 setFont:[UIFont fontWithName:#"Helvetica-Bold" size:16.0]];
[label1 setTextColor:[UIColor blackColor]];
label1.text = [[self.tableDataSource objectAtIndex:indexPath.row] objectForKey:#"Name"];
[cell addSubview:label1];
UILabel *label2 = [[UILabel alloc]initWithFrame:CGRectMake(253.5, 10, 243.5, 25)];
[label2 setFont:[UIFont fontWithName:#"Helvetica-Bold" size:16.0]];
[label2 setTextColor:[UIColor blackColor]];
label2.text = [[self.tableDataSource objectAtIndex:indexPath.row] objectForKey:#"Email"];
[cell addSubview:label2];
UILabel *label3 = [[UILabel alloc]initWithFrame:CGRectMake(507, 10, 243.5, 25)];
[label3 setFont:[UIFont fontWithName:#"Helvetica-Bold" size:16.0]];
[label3 setTextColor:[UIColor blackColor]];
label3.text = [[self.tableDataSource objectAtIndex:indexPath.row] objectForKey:#"Phone"];
[cell addSubview:label3];
UILabel *label4 = [[UILabel alloc]initWithFrame:CGRectMake(760.5, 10, 243.5, 25)];
[label4 setFont:[UIFont fontWithName:#"Helvetica-Bold" size:16.0]];
[label4 setTextColor:[UIColor blackColor]];
label4.text = [[self.tableDataSource objectAtIndex:indexPath.row] objectForKey:#"Business"];
[cell addSubview:label4];
return cell;
}
click for larger image
Any specific reason you're using UILabels? I checked the code for an iOS6 application I have and I used NSStrings.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *newTitle = #"my string";
cell.textLabel.text = newTitle;
}
Turns out I had to set each label's background color to clear:
label.backgroundColor = [UIColor clearColor];
set clear background colour for labels
label.backgroundColor = [UIColor clearColor];
I'm trying to add an extra UILabel into each cell(UITableView)
I'v succeeded with this code in
(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath method
Here's my code
//add another text
UILabel *test = [[UILabel alloc] initWithFrame:CGRectMake(250,80,50,20.0)];
test.text = [NSString stringWithFormat: #"test"];
test.backgroundColor = [UIColor clearColor];
test.font=[UIFont fontWithName:#"AppleGothic" size:20];
[cell addSubview:test];
However I figured that if I do this, I can't add different text to each cell, instead, it ends up with the same text in all cells. Can anyone tell me how to do that?
Oh and another problem was that if I do this, "test" is displayed in every cell except for the first one.
Have a look at the tutorial "UITableView – Adding subviews to a cell’s content view".
Try something like this
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier {
CGRect CellFrame = CGRectMake(0, 0, 320, 65);
CGRect Label1Frame = CGRectMake(17,5,250,18);
UILabel *lblTemp;
UITableViewCell *cell = [[[UITableViewCell alloc] initWithFrame:CellFrame reuseIdentifier:cellIdentifier] autorelease];
lblTemp = [[UILabel alloc] initWithFrame:Label1Frame];
[lblTemp setFont:[UIFont fontWithName:#"Arial-BoldMT" size:15]];
lblTemp.tag = 1;
lblTemp.backgroundColor=[UIColor clearColor];
lblTemp.numberOfLines=0;
[cell.contentView addSubview:lblTemp];
return cell; // this I forgot
}
in cellForRowAtIndexPath
{
if(cell == nil)
cell = [self getCellContentView:CellIdentifier];
UILabel *lblTemp1 = (UILabel *)[cell viewWithTag:1];
lblTemp1.text =[nameArray objectAtIndex:value+indexPath.row];
return cell;
}
For having the same Label on all cells, you are probably instantiating just one cell and use the cellReUseIdentifier for all cells. So, I suggest that you create different labels as properties of the class, and assign each property-label to each cell.
// For example -
if (indexPath.row ==0 )
// assign [cell.contentView addSubview: self.label1];
if (indexPath.row ==1 )
// assign [cell.contentView addSubview: self.label2];
And for the second part of the question, please post your cellForRowAtIndexPath fully - there could be an error in that.
First check if any of the predefined styles work for you.
If you need more flexibility than what they offer, you can try something like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [self makeCell: CellIdentifier];
}
MyData *data = [self.data objectAtIndex:indexPath.row];
UILabel *lbl1 = (UILabel *)[cell viewWithTag:1];
UILabel *lbl2 = (UILabel *)[cell viewWithTag:2];
lbl1.text = data.text;
lbl2.text = data.auxText;
return cell;
}
- (UITableViewCell *)makeLensListCell: (NSString *)identifier
{
CGRect lbl1Frame = CGRectMake(10, 0, 140, 25);
CGRect lbl2Frame = CGRectMake(10, 150, 140, 25);
UILabel *lbl;
UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier] autorelease];
// Label with tag 1.
lbl = [[UILabel alloc] initWithFrame:lbl1Frame];
lbl.tag = 1;
[cell.contentView addSubview:lbl];
[lbl release];
// Label with tag 2.
lbl = [[UILabel alloc] initWithFrame:lbl2Frame];
lbl.tag = 2;
lbl.textColor = [UIColor lightGrayColor];
[cell.contentView addSubview:lbl];
[lbl release];
// Add as many labels and other views as you like
return cell;
}
This approach also allows images and other views.
I cannot get my UITableView to load data as i am scrolling. I do have subview in the cell (two lines). It display the first screen correctly but when i scroll only the lines that is on the first screen displays, nothing to scroll.
I have two arrays cellArray1 (main line) and cellArray2 (second line) that I load data from.
I would very much appreciate help to solve this, possible, simple problem.
Here is what i think is relevant code for this question:
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier
{
CGRect CellFrame = CGRectMake(0, 0, 300, 60);
CGRect Label1Frame = CGRectMake(10, 10, 290, 25);
CGRect Label2Frame = CGRectMake(30, 33, 270, 25);
UILabel *lblTemp;
UITableViewCell *cell = [[[UITableViewCell alloc] initWithFrame:CellFrame reuseIdentifier:cellIdentifier] autorelease];
//Initialize Label with tag 1.
lblTemp = [[UILabel alloc] initWithFrame:Label1Frame];
lblTemp.backgroundColor = [UIColor orangeColor];
[lblTemp setFont:[UIFont fontWithName:#"American Typewriter" size:16]];
lblTemp.tag = 1;
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Initialize Label with tag 2.
lblTemp = [[UILabel alloc] initWithFrame:Label2Frame];
lblTemp.backgroundColor = [UIColor orangeColor];
lblTemp.tag = 2;
[lblTemp setFont:[UIFont fontWithName:#"American Typewriter" size:13]];
lblTemp.textColor = [UIColor whiteColor];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
return cell;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) cell = [self getCellContentView:CellIdentifier];
UILabel *lblTemp1 = (UILabel *)[cell viewWithTag:1];
UILabel *lblTemp2 = (UILabel *)[cell viewWithTag:2];
lblTemp1.text = [cellArray1 objectAtIndex:indexPath.row];
lblTemp2.text = [cellArray2 objectAtIndex:indexPath.row];
tableView.backgroundColor = [UIColor orangeColor];
return cell;
}
The answer to this problem was that I had hard coded a parameter that dictate how many items that was loaded during my testing.
I just found the problem, i had hard coded a parameter that dictated how many items that was
Make sure you are adding to the correct view if you are creating programatically and adding as subview to main view.
I have this wierd problem with my table
i Have about 20 cells to display
Each cell is about 84px in height
When i click no the cell, i have set a background colour
The first 4 cells are ok, but when i scroll down and click on the 5th cell, the content of each cell starts to overlap with some other content, usually content from 1st 4 cells.
I belive its some cell reusability or drawing issue. Am not sure how to solve it, i have checked through my code, but i am not changing the cell's content on touch.
Here is my code and will add some pics too
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 104;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [stores count];
}
-(UITableViewCell *)tableView:(UITableView *) tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
CGRect Label1Frame = CGRectMake(5, 5, 250, 30);
CGRect Label2Frame = CGRectMake(6, 42, 220, 20);
CGRect Label3Frame = CGRectMake(6, 62, 220, 20);
CGRect Label4Frame = CGRectMake(240,56, 70, 12);
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] autorelease];
}else{
// a cell is being recycled, remove the old edit field (if it contains one of our tagged edit fields)
UIView *viewToCheck = nil;
viewToCheck = [cell.contentView viewWithTag:1];
if (!viewToCheck) {
[viewToCheck removeFromSuperview];
DebugLog(#"View removed");
}
}
//cell.selectionStyle=UITableViewCellSelectionStyleNone;
[cell setSelectedBackgroundView:bgView];
NSInteger row=indexPath.row;
UILabel *lblTemp;
[[cell contentView] clearsContextBeforeDrawing];
//Line 1
lblTemp=[[UILabel alloc] initWithFrame: Label1Frame];
lblTemp.tag=1;
lblTemp.text=[[stores objectAtIndex:row] objectAtIndex:0] ;
lblTemp.numberOfLines=2;
lblTemp.font = [UIFont boldSystemFontOfSize:13];
lblTemp.adjustsFontSizeToFitWidth=YES;
lblTemp.minimumFontSize=12;
lblTemp.textColor = [UIColor grayColor];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Line 2
lblTemp = [[UILabel alloc] initWithFrame:Label2Frame];
lblTemp.tag = 2;
lblTemp.text=[[stores objectAtIndex:row]objectAtIndex:1];
lblTemp.font = [UIFont systemFontOfSize:12];
lblTemp.textColor = [UIColor grayColor ];
lblTemp.textAlignment=UITextAlignmentLeft;
lblTemp.adjustsFontSizeToFitWidth=YES;
lblTemp.minimumFontSize=12;
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Line 3
lblTemp = [[UILabel alloc] initWithFrame:Label3Frame];
lblTemp.tag = 3;
lblTemp.text=[[stores objectAtIndex:row]objectAtIndex:2];
lblTemp.font = [UIFont systemFontOfSize:12];
lblTemp.textColor = [UIColor grayColor ];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Phone button
UIButton *phoneButton=[[UIButton alloc] initWithFrame:CGRectMake(240,16,30,30)];
[phoneButton setBackgroundImage:[UIImage imageNamed:#"phone.png"] forState:UIControlStateNormal];
[phoneButton setTag:row];
[phoneButton addTarget:self action:#selector(dialNumber:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:phoneButton];
//ANnotation button
UIButton *annotation=[[UIButton alloc] initWithFrame:CGRectMake(274,16,30,30)];
[annotation setTag:row];
[annotation setBackgroundImage:[UIImage imageNamed:#"tab.png"] forState:UIControlStateNormal];
[annotation addTarget:self action:#selector(openMap:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:annotation];
[annotation release];
//Distance label
//Line 3
lblTemp = [[UILabel alloc] initWithFrame:Label4Frame];
lblTemp.tag = 4;
lblTemp.text=[[stores objectAtIndex:row]objectAtIndex:5];
lblTemp.textAlignment=UITextAlignmentCenter;
lblTemp.font = [UIFont systemFontOfSize:13];
lblTemp.textColor = [UIColor grayColor ];
[lblTemp setAdjustsFontSizeToFitWidth:YES];
[cell.contentView addSubview:lblTemp];
[phoneButton release];
[lblTemp release];
[cell setNeedsLayout];
[cell setNeedsDisplay];
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell=[tableView cellForRowAtIndexPath:indexPath ];
for(UILabel *lbl in cell.contentView.subviews){
if([lbl isKindOfClass:[UILabel class]]){
lbl.textColor=[UIColor whiteColor];
}
}
//UITableViewCell *cell1;
//NSString *row=[NSString stringWithFormat:#"%d",indexPath.row];
svm = [[storesMapView alloc] initWithNibName:#"storesMapView" bundle:nil];
[svm initWithXML:stores:indexPath.row];
CGRect theFrame = svm.view.frame;
theFrame.origin = CGPointMake(self.view.frame.size.width, 0);
svm.view.frame = theFrame;
theFrame.origin = CGPointMake(0,0);
theFrame.size=CGSizeMake(320,355);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3f];
svm.view.frame = theFrame;
[UIView commitAnimations];
[subView addSubview:svm.view];
backButton.hidden=NO;
}
I figured it out with some trial and error; if this can help some one
In cellforRowAtIndexPath i tried to clear all the cells subview before drawing the cell
//TRY TO REMOVE ALL CONTENT
for(UIView *view in cell.contentView.subviews){
if ([view isKindOfClass:[UIView class]]) {
[view removeFromSuperview];
}
}
I would be happy if someone can point me to some easier way
Thanks
You can use
[[[cell contentView] subviews] makeObjectsPerformSelector: #selector(removeFromSuperview)];
If the cell in not nil, the above code will reduce the time for using the for loop similar to this
for(UIView *eachView in [cell subviews])
[eachView removeFromSuperview];
I also had the same issue.I also had composed tableView with labels.And when I scroll it down the contents got overlapped.But it got solved simply by editing one statement in cellForRowAtIndexPath.
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
I think this will solve your problem.
I know this is a bit late, but I had a similar issue where UILabels created for a cell were still part of the cell when it was reused. So each successive update of the tableview created another UILabel on top of the existing one. I moved the creation of the Labels into the if condition as below and it resolved my issue. Hope it helps someone else. Also note no release as I am using ARC.
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cityText = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 100, 20)];
cityText.font = [UIFont fontWithName:#"Arial" size:20];
cityText.textAlignment = UITextAlignmentLeft;
cityText.backgroundColor = [UIColor clearColor];
regionText = [[UILabel alloc] initWithFrame:CGRectMake(10, 40, 100, 20)];
regionText.font = [UIFont fontWithName:#"Arial" size:20];
regionText.textAlignment = UITextAlignmentLeft;
regionText.backgroundColor = [UIColor clearColor];
}
Setting nil to label text on UITableViewCell subclass 's method prepareForReuse() solved my problem -
override func prepareForReuse() {
super.prepareForReuse()
self.label1.text = nil
self.label2.text = nil
....
}
Shared if it helps anyone!