Using UIView animateWithDuration, I'm setting a UITableView alpha to 0 so that it fades away in a disappearing animation. However, I'm noticing that when the UITableView fades, there are areas on each cell that turn black before fading. If there is an image, the whole area behind it turns black while fading, and usually the inset space on both the left and right edge turn black. I've tried setting all of the background colors of the UITableViewCell subviews to white and it still doesn't work.
This tableview is not embedded in a UITableViewController. Instead, it's a separate floating tableView that I'm using as a menu.
Here is an example of what happens when it's fading:
Here is the code I'm using as well
[UIView animateWithDuration:ImageViewControllerBarsAnimationDuration delay:0 options: UIViewAnimationOptionAllowUserInteraction animations:^
{
if (self.menu.superview)
{
self.menu.alpha = 0;
}
}
completion:^(BOOL finished)
{
if (self.menu.superview)
{
[self.menu removeFromSuperview];
self.menu.alpha = 1;
}
}];
+
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"Cell";
UITableViewCell *tableViewCell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (tableViewCell == nil)
{
tableViewCell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
[[tableViewCell textLabel] setFont:[UIFont fontWithName: #"Helvetica-Bold" size: 17]];
[[tableViewCell textLabel] setText: [self.menuItems objectAtIndex:0]];
[[tableViewCell imageView] setImage: [self.menuItems objectAtIndex:1]];
return tableViewCell;
}
DTS gave me a solution to this, have to do the following:
self.myTableView.backgroundView = nil;
self.myTableView.backgroundColor = [UIColor clearColor];
Then inside of cellForRowAtIndexPath method have to do this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *kOneCellID = #"cellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kOneCellID];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kOneCellID] autorelease];
cell.backgroundView = [[UIView alloc] init];
cell.backgroundView.backgroundColor = [UIColor whiteColor];
}
...
}
What is self.menu? If you put tableView in its place it works exactly fine.
[UIView animateWithDuration:ImageViewControllerBarsAnimationDuration delay:0 options: UIViewAnimationOptionAllowUserInteraction animations:^
{
if (tableView.superview)
{
tableView.alpha = 0;
}
}
completion:^(BOOL finished)
{
if (tableView.superview)
{
[tableView removeFromSuperview];
tableView.alpha = 1;
}
}];
Related
Edit:
Thanks everyone, but this has gotten to be too general as it is clear there are deeper issues at hand. I'm going to try to delete this question. I appreciate all of your help!
We have a large UITableViewCell with a UILabel inside and we want to detect the user's single tap or touch on that label. We're adding a UITapGestureRecognizer inside of our subclassed UITableViewCell:
CGRect frame = CGRectMake(0, 10, 150, 20);
self.titleLabel = [[UILabel alloc] initWithFrame:frame];
self.titleLabel.text = self.title;
self.titleLabel.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(expandButtonTapped:)];
singleTap.numberOfTapsRequired = 1;
singleTap.numberOfTouchesRequired = 1;
[self.titleLabel addGestureRecognizer:singleTap];
[cell.contentView addSubview:self.titleLabel];
We've also tried setting the target to the cell's UITableViewController, but same result, the action doesn't get performed. When checking the debugger, the gesture is indeed there and attached to the label.
Edit: After more investigating, if we add a normal UIButton to the cell, it cannot be clicked. Doing more investigating, but here is the cellForRowAtIndexPath method:
- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (![self.metaDataSections count]) {
return nil;
}
ACMTableCellMetaData *metaData = [self metaDataForIndexPath:indexPath];
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:metaData.reuseIdentifier];
if (cell == nil) {
cell = [metaData createCell];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell = [metaData updateCellWithCellForReuse:cell];
return cell;
}
The createCell method:
- (UITableViewCell *)createCell
{
UITableViewCell *cell = [super createCell];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:self.reuseIdentifier];
cell.frame = CGRectMake(CGRectGetMinX(cell.contentView.frame),
CGRectGetMinY(cell.contentView.frame),
CGRectGetWidth(cell.contentView.frame),
ACM_TABLE_CELL_HEIGHT);
[self setupExpandButtonInCell:cell];
}
return cell;
}
updateCell method:
- (UITableViewCell *)updateCellWithCellForReuse:(UITableViewCell *)cell {
UILabel * titleLabel = (UILabel *)[cell.contentView viewWithTag:TITLE_TAG];
titleLabel = self.titleLabel;
self.cell = [super updateCellWithCellForReuse:cell];
return self.cell;
}
I clipped out some code that I don't believe affects anything. The didSelectRowAtIndexPath that is being over ridden in the the subclassed tableview doesn't have anything that would prevent user taps. But strangely, if I put a break point there, it never gets hit when tapping the cells. So I believe there are other issues at play here. We can't see why this is the case however.
If you are writing this code in class, which inherits UITableViewCell, then instead of
[cell.contentView addSubview:self.titleLabel];
use
[self addSubView:self.titleLabel];
make sure to implement
-(void)expandButtonTapped:(parameter type)parameter{
}
in the same class.
I forgot to mention about
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
TableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(!cell)
{
cell = [[TableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
}
// Configure the cell...
return cell;
}
Table view center cell always highlight like a picker. If I select the center cell, that value is return. If I scroll the table at the time center point must highlighted the values only change(like picker action)How to do this? Any sample code for this task. Thanks in advance.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
UILabel *modelLabel;
UIButton *modelButton;
modelButton = [UIButton buttonWithType:UIButtonTypeCustom];
modelButton.frame = CGRectMake(0.0, 0.0, LABEL_WIDTH, LABEL_HEIGHT);
modelButton.tag = indexPath.row+100;
[modelButton addTarget:nil action:#selector(modelButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[[cell contentView] addSubview:modelButton];
modelLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, LABEL_WIDTH, LABEL_HEIGHT)];
modelLabel.text = [NSString stringWithFormat:#"%#", [[modelArray objectAtIndex:indexPath.row] valueForKey:#"Model"]];
modelLabel.tag = indexPath.row+1000;
modelLabel.backgroundColor = [UIColor clearColor];
modelLabel.textColor = [UIColor grayColor];
modelLabel.alpha = 0.5;
modelLabel.textAlignment = UITextAlignmentCenter;
modelLabel.font = EUROSLITE_FONT(14);
[[cell contentView] addSubview:modelLabel];
}
return cell;
}
The rows count is 700, 800, like this.
A UITableView extends UIScrollView. So you can implement the following delegate:
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
There you can check the scrollView.contentOffset and set the corresponding cell to highlighted. Please note, that's not the center cell. You need to add (int)(scrollView.frame.size.height/2)-(int)(cell.frame.size.height/2) on scrollView.contentOffset.y.
Example (Please de-highlight all other cells):
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
[[tableView visibleCells] makeObjectsPerformSelector:#selector(setHighlighted:) withObject:[NSNumber numberWithBool:NO]];
CGPoint center = CGPointMake(0, scrollView.contentOffset.y+(int)(scrollView.frame.size.height/2));
NSIndexPath *cellIndexPath = [tableView indexPathForRowAtPoint:center];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:cellIndexPath];
[cell setHighlighted:YES];
}
I need to load some data in a table view and while this is going on in the background I want to add an activity indicator in order to show that there is a process going on and will hide once the process finishes. What would be the most efficient way to implement something like this?
Depends, whether you want to block your user or not and also how important is the activity indication.
If you don't want to block user, use Application.networkActivityIndicatorVisible, if you want to have larger activity indicator and still not to block user, animate UIView with text and UIActivityIndicator below the table view (tableview.height -= activityview.height) and then hide on complete or if you would like to block user, use blocking activity indicator.
http://www.dejal.com/developer/?q=developer/dsactivityview
https://github.com/jdg/MBProgressHUD (I was using MBProgressHUD personally and it's easy to learn and use)
You can add a view which has a UIIndicatorView and a UILabel as your cell's subview. You can use this way to show error data loading/ error network/ empty data...
Example:
Your Controller can define two modes: UITableViewModeMessage and UITableViewModeData.
In viewDidLoad, you set self.tableViewMode = UITableViewModeMessage. When has returned data, set self.tableViewMode = UITableViewModeData and reload data for tableview.
Some code:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (self.tableViewMode == UITableViewModeMessage) {
return 2;
} else {
return self.yourEntries ? self.yourEntries.count : 0;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (self.tableViewMode == UITableViewModeMessage) {
return [self tableView:tableView messageCellForRowAtIndexPath:indexPath];
} else {
return [self tableView:tableView dataCellForRowAtIndexPath:indexPath];
}
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
// Remove Loading... progress view if exist.
UIView *progressView = [cell viewWithTag:100];
[progressView removeFromSuperview];
if (self.tableViewMode == UITableViewModeMessage) {
if (indexPath.row == 1) {
// remove the current label.
cell.textLabel.text = nil;
// We build progress view and attach to cell here but not in cellForRowAtIndexPath is because in this method cell frame is already calculated.
UIView *progressView = [self progressViewForCell:cell message:#"Loading..." alpha:0.9];
[cell addSubview:progressView];
}
}
}
// cell to display when loading
- (UITableViewCell *)tableView:(UITableView *)tableView messageCellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"MessageCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.textLabel.textColor = [UIColor grayColor];
cell.textLabel.textAlignment = UITextAlignmentCenter;
}
if (indexPath.row == 1) {
cell.textLabel.text = #"Loading...";
} else {
cell.textLabel.text = nil;
}
return cell;
}
// cell to display when has data
- (UITableViewCell *)tableView:(UITableView *)tableView dataCellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"DataCell";
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [[self.yourEntries objectAtIndex:indexPath.row] description];
return cell;
}
// Build a view which has a UIActivityIndicatorView and a UILabel
- (UIView *)progressViewForCell:(UITableViewCell *)cell message:(NSString *)message alpha:(CGFloat)alpha
{
// NOTE: progressView needs to be removed from cell in cellForRowAtIndexPath:
CGRect progressViewFrame = CGRectZero;
progressViewFrame.size.width = CGRectGetMaxX(cell.bounds);
progressViewFrame.size.height = CGRectGetMaxY(cell.bounds) - 2;
UIView *progressView = [[UIView alloc] initWithFrame:progressViewFrame];
progressView.backgroundColor = RGBA(255, 255, 255, 1);
progressView.alpha = alpha;
progressView.tag = 100;
UILabel *loadingLabel = [[UILabel alloc] initWithFrame:progressView.bounds];
loadingLabel.backgroundColor = [UIColor clearColor];
loadingLabel.font = [UIFont systemFontOfSize:14];
loadingLabel.textColor = [UIColor blackColor];
loadingLabel.textAlignment = UITextAlignmentCenter;
loadingLabel.text = message;
CGFloat widthOfText = [loadingLabel.text sizeWithFont:loadingLabel.font].width;
CGFloat spaceBetweenIndicatorAndLabel = 5;
// activityIndicatorView has size in which width and height is equal to 20.
UIActivityIndicatorView *activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[activityIndicatorView setCenter:CGPointMake(CGRectGetMidX(cell.bounds) - (widthOfText / 2) - (activityIndicatorView.bounds.size.width / 2) - spaceBetweenIndicatorAndLabel, CGRectGetMidY(cell.bounds))];
[activityIndicatorView setColor:[UIColor blackColor]];
[activityIndicatorView startAnimating];
[progressView addSubview:activityIndicatorView];
[progressView addSubview:loadingLabel];
return progressView;
}
I created contentViews and assigned tags. When I click row in simulator, I cannot get right tag value. Tag value is always 0.
What is wrong with my code?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UIImageView *imgView, *imgView1;
if(cell == nil)
{
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
cell.textLabel.text = #"test";
imgView = [[UIImageView alloc] initWithFrame:CGRectMake(100,0,20,62)];
[imgView setImage:[UIImage imageNamed:#"1.png"]];
imgView.tag = 10;
[cell.contentView addSubview:imgView];
[imgView release];
imgView1 = [[UIImageView alloc] initWithFrame:CGRectMake(200,0,20,62)];
[imgView1 setImage:[UIImage imageNamed:#"2.png"]];
imgView1.tag = 20;
[cell.contentView addSubview:imgView1];
[imgView1 release];
}
else
{
imgView = (id)[cell.contentView viewWithTag:10];
imgView1 = (id)[cell.contentView viewWithTag:20];
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (cell.contentView.tag == 10) // tag is always 0. What's wrong?
NSLog(#"10");
else if (cell.contentView.tag == 20)
NSLog(#"20");
}
You're querying the tag of the contentview, but adding the tag to a subview of the contentview.
CellView
ContentView //You're asking for the tag of this
Subview //But assigning the tag to this
Try ((UIView*)[cell.contentview subviews] objectAtIndex:0]).tag
cell.contentView.tag returns the tag of the cell contentView but in your code, you set the tag of the subviews (image view) of contentView.
I am having a problem setting a UIImageView or UIView on the cell of the Grouped table on the iPhone.
For this I am using this code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = #"SimpleTableIdentifier";
NSArray *listData =[self.tableContents objectForKey:[self.sotreKeys objectAtIndex:[indexPath section]]];
UITableViewCell * cell = [tableView
dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
if(cell == nil) {
cell = [[[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier] autorelease];
}
if(indexPath.section == 1 && indexPath.row ==1)
{
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(240, 14, 40, 40)];
imageView.image = [UIImage imageNamed:[NSString stringWithFormat:#"Back.png",nil]];
[cell.contentView addSubview:imageView];
[imageView release];
}
NSUInteger row = [indexPath row];
cell.textLabel.text = [listData objectAtIndex:row];
return cell;
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
But it is not placed on the cell . When ever I select the row it will display for that time only, what is the problem?
Does anyone have any idea what the problem is. I think the image is getting overwritten by the cell .
Thanks in advance
try making
cell.accessoryType = UITableViewCellAccessoryNone;
It seems that you are adding image on accessory view.
If yes, you can add cell.accessoryView = imageView;
I do have some ideas of what might be happening.
You are adding an image view to the contentView then you are setting the text of the textLabel which is a part of the contentView and is probably sitting on top of the image. Try this and see if you can at least see your image on the left side.
cell.imageView.image = [UIImage imageNamed:#"Back.png"];
Now when you dequeue cells you need to remember that all the views you added last time you created the cell are still there, so as you scroll you will just be stacking back buttons on top of each other.
Also the following line [tableView deselectRowAtIndexPath:indexPath animated:YES]; is dead code because it occurs after a return statement. You might want to place that in the delegate call – tableView:willDisplayCell:forRowAtIndexPath:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = #"SimpleTableIdentifier";
NSArray *listData =[self.tableContents objectForKey:[self.sotreKeys objectAtIndex:[indexPath section]]];
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
if(cell == nil) {
cell = [[[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier] autorelease];
}
if(indexPath.section == 1 && indexPath.row ==1)
{
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(240, 14, 40, 40)];
imageView.image = [UIImage imageNamed:#"Back.png"];
[cell.contentView addSubview:imageView];
[imageView release];
}
cell.textLabel.text = [listData objectAtIndex:indexPath.row];
return cell;
}
Make sure that your image is named "Back.png" not "back.png" because the iOS on the phone is key sensitive.