I have a UILabel in UITableView. Here is the code i have written in cellForRowAtIndexPath
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectMake(30.0, 5.0, 250.0, 35.0) reuseIdentifier:CellIdentifier] autorelease];
}
CGRect rect = CGRectMake(30.0, 5.0, 250.0, 35.0);
UILabel *label = [[UILabel alloc] initWithFrame:rect];
label.opaque = NO;
label.font = [UIFont systemFontOfSize:14];
label.numberOfLines = 2;
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor darkGrayColor];
label.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
[label setText:#"Test Message"];
[cell addSubview:label];
[label release];
cell.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
My intention was to set the background of cell and UILabel as transparent.
But it is not working. can any one tell me what i am missing here
Thanks
Sandeep
Change the following line:
label.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
to this:
label.backgroundColor = [UIColor clearColor];
For those using Xamarin.iOS it's obviously:
UILabel myLabel = new UILabel();
myLabel.Text = "Hello world!";
myLabel.BackgroundColor = UIColor.Clear;
[label setBackGroundColor:[UIColor clearColor]];
To set the clearBackGround Color for a label
Related
I have a UITextField in a UITableViewCell.
Even though I set -
textField.userInteractionEnabled = NO;
textField.enabled = NO
But when I click on the table cell which contains the textField, the keyboard comes up for the textfield.
Why is this happening and how can I prevent it?
EDIT: Strangely this is happening when I first set some text in the textfield. When the textfield is empty, it is not editable.
EDIT: Code for cellForRowAtIndexPath -
cell = [tableView dequeueReusableCellWithIdentifier:#"CellIdentifier"];
cell.accessoryType = UITableViewCellAccessoryNone;
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, cell.bounds.size.width - 20, cell.bounds.size.height - 20)];
textField.font = [UIFont systemFontOfSize:15];
textField.textColor = [UIColor blackColor];
UIColor *placeholderColor = [UIColor colorWithRed:146/255.0 green:146/255.0 blue:146/255.0 alpha:1];
textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:[self getPlaceHolderTextForIndexPath:indexPath] attributes:#{NSForegroundColorAttributeName : placeholderColor}];
textField.keyboardType = [self getKeyboardTyeForIndexPath:indexPath];
textField.returnKeyType = UIReturnKeyDone;
textField.backgroundColor = [UIColor clearColor];
textField.textAlignment = NSTextAlignmentLeft;
textField.autocapitalizationType = [self getAutocapitaliztionTypeForIndexPath:indexPath];
textField.tag = 1;
if (_editingNotAllowed) {
[textField setText:[self getTextForTextFieldWithIndexPath:indexPath]];
[textField setUserInteractionEnabled:NO];
textField.enabled = NO;
} else {
[textField setUserInteractionEnabled:YES];
}
[cell.contentView addSubview:textField];
You should create an UITableViewCell as shown in this repo :)
https://github.com/breeno/EditingUITableView
And use your custom UITableViewCell like this:
if(condition){ // Check the row must be TextField
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier: nil];
if(!cell){
cell = [[CustomCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: nil];
}
cell.label.text = #"Title Row"; //UITextLabel Title
UIColor *placeholderColor = [UIColor colorWithRed:146/255.0 green:146/255.0 blue:146/255.0 alpha:1];
cell.textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:[self getPlaceHolderTextForIndexPath:indexPath] attributes:#{NSForegroundColorAttributeName : placeholderColor}];
cell.textField.returnKeyType = UIReturnKeyDone;
cell.textField.backgroundColor = [UIColor clearColor];
cell.textField.textAlignment = NSTextAlignmentLeft;
cell.textField.tag = 1;
} else { // Normal UITableViewCell
}
I upgraded to XCODE 4.2 and suddenly i got all these warning signals. Most of the i am able to fix but the following I do not know how to. I have tried to read-up on it but still have problem.
The code that is deprecated is:
UITableViewCell *cell = [[[UITableViewCell alloc] initWithFrame:CellFrame reuseIdentifier:cellIdentifier] autorelease];
I know that i need to use the following:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
However, i get problem with the CellFrame etc. when i test.
Could someone please give me a hint how i should replace the deprecated code with the initWithStyle and get the same result?
Here is the full code:
- (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);
CGRect Label3Frame = CGRectMake(30, 56, 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 colorWithRed:0.0f green:0.0f blue:0.3f alpha:1.0f];
lblTemp.textColor = [UIColor whiteColor];
lblTemp.backgroundColor = [UIColor clearColor];
[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 colorWithRed:0.0f green:0.0f blue:0.3f alpha:1.0f];
lblTemp.tag = 2;
[lblTemp setFont:[UIFont fontWithName:#"American Typewriter" size:13]];
lblTemp.textColor = [UIColor whiteColor];
lblTemp.backgroundColor = [UIColor clearColor];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Initialize Label with tag 3.
lblTemp = [[UILabel alloc] initWithFrame:Label3Frame];
lblTemp.backgroundColor = [UIColor colorWithRed:0.0f green:0.0f blue:0.3f alpha:1.0f];
lblTemp.tag = 3;
[lblTemp setFont:[UIFont fontWithName:#"American Typewriter" size:13]];
lblTemp.textColor = [UIColor whiteColor];
lblTemp.backgroundColor = [UIColor clearColor];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
return cell;
}
Just at first initialize with style, and after set reuired frame. I don't see any problems:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
cell.frame = CellFrame;
}
Something along those lines
cell = [[[UITableViewCell alloc] initWithStyle:somestyle reuseIdentifier:#"cellname"] autorelease]
cell.frame = cellFrame;
Iam not sure if you really need to set the cell frame unless you want some specific frame, it should be set to whatever the tableview is.
i just use this code
cell = [[customCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
return cell;
}
I am making a custom backBarButtonItem with a PNG and that works just fine. The only question is how to change the text color. The way I did that on my navigation bar was this:
CGRect frame = CGRectMake(0, 0, 400, 44);
UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont boldSystemFontOfSize:20.0];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"aColor.png"]];
self.navigationItem.titleView = label;
label.text = #"aTitle";
dont use autorelease for set label to titleview,after assign them release them
CGRect frame = CGRectMake(0, 0, 400, 44);
UILabel *label = [[UILabel alloc] initWithFrame:frame];
label.backgroundColor = [UIColor clearColor];
label.font = [UIFont boldSystemFontOfSize:20.0];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"aColor.png"]];
label.text = #"aTitle";
self.navigationItem.titleView = label;
[label release];
I created an application using UITableView. I parsing the data from URL and listed in UITableView.
But in UITableView, the first the data only displayed again and again.
I don't know why this problem occurred.
My code is as below:
-(UITableViewCell *)tableView:(UITableView *)tableView1 cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView1 dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
CGRect frame = CGRectMake(10.0f, 5.0, 300.0, 55);
valueField = [[UILabel alloc] initWithFrame:frame];
[valueField setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
valueField.tag = 111;
valueField.font=[UIFont fontWithName:#"Helvetica" size:16.0];
valueField.textAlignment = UITextAlignmentLeft;
valueField.lineBreakMode=UILineBreakModeWordWrap;
valueField.numberOfLines = 0;
valueField.textColor = [UIColor whiteColor];
valueField.highlightedTextColor = [UIColor whiteColor];
valueField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
valueField.adjustsFontSizeToFitWidth = YES;
valueField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
valueField.text=[title1 objectAtIndex:count1];
[cell.contentView addSubview:valueField];
UIImage *favOn = [UIImage imageNamed:#""];
UIImage *favOff = [UIImage imageNamed:#""];
titlebutton = [[UIButton alloc] initWithFrame:CGRectMake(10.0f, 15.0, 300.0, 55)];
[titlebutton setTag:indexPath.row];
//titlebutton.tag = 111;
[titlebutton setImage:favOff forState:UIControlStateNormal];
[titlebutton setImage:favOn forState:UIControlStateSelected];
if([self getFavState:#"111"])
{
[titlebutton setSelected:YES];
}
else
{
[titlebutton setSelected:NO];
}
[titlebutton addTarget:self action:#selector(favButtonSwitch:) forControlEvents:UIControlEventTouchUpInside];
[titlebutton setBackgroundColor:[UIColor clearColor]];
[titlebutton setTitle:#"" forState:UIControlStateNormal];
[cell.contentView addSubview:titlebutton];
CGSize labelSize = [valueField.text sizeWithFont:valueField.font constrainedToSize:valueField.frame.size lineBreakMode:UILineBreakModeWordWrap];
int labelHeight = labelSize.height;
NSLog(#"labelHeight = %d", labelHeight);
frame = CGRectMake(10.0f, 40.0, 300.0, 55);
pubField = [[UILabel alloc] initWithFrame:frame];
[pubField setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
pubField.tag = 111;
pubField.font=[UIFont fontWithName:#"Helvetica" size:12.0];
pubField.textAlignment = UITextAlignmentLeft;
pubField.lineBreakMode=UILineBreakModeWordWrap;
pubField.numberOfLines = 0;
pubField.textColor = [UIColor whiteColor];
pubField.highlightedTextColor = [UIColor whiteColor];
pubField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
pubField.adjustsFontSizeToFitWidth = YES;
pubField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
pubField.text=[pubDate objectAtIndex:indexPath.row];
[cell.contentView addSubview:pubField];
frame = CGRectMake(5.0, 70.0, 300.0, 55);
desField = [[UILabel alloc] initWithFrame:frame];
[desField setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
desField.tag = 111;
desField.font=[UIFont fontWithName:#"Helvetica" size:13.0];
desField.textAlignment = UITextAlignmentLeft;
desField.lineBreakMode=UILineBreakModeWordWrap;
desField.numberOfLines = 0;
desField.textColor = [UIColor whiteColor];
desField.highlightedTextColor = [UIColor whiteColor];
desField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
desField.adjustsFontSizeToFitWidth = YES;
desField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
desField.text=[description objectAtIndex:indexPath.row];
[cell.contentView addSubview:desField];
}
UIImage *patternImage = [UIImage imageNamed:#"bg.jpg"];
UIView *backView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
backView.backgroundColor = [UIColor colorWithPatternImage: patternImage];
cell.backgroundView = backView;
NSString *image1 =[images objectAtIndex:indexPath.row];
NSLog(#"Images ..... = %#",image1);
NSData *mydata = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[images objectAtIndex:indexPath.row]]];
UIImage *myimage = [[UIImage alloc] initWithData:mydata];
UIImageView *imageView = [ [ UIImageView alloc ] initWithImage: myimage ];
imageView.frame = CGRectMake(10.0f, 110.0f, 120.0f, 120.0f);
[cell.contentView addSubview:imageView];
return cell;
}
do all the alloc/init and all things, that will be the same in any cell in the
if(cell==nil){
//<-- here
}
while setting text and any thing that changes by the specific data outside the block
if(cell==nil){
}
//<-- here
i.e:
if(cell==nil){
//....
valueField.tag = 111;
valueField.font = [UIFont fontWithName:# "Helvetica" size:16.0];
valueField.textAlignment = UITextAlignmentLeft;
valueField.lineBreakMode = UILineBreakModeWordWrap;
valueField.numberOfLines = 0;
valueField.textColor = [UIColor whiteColor];
valueField.highlightedTextColor = [UIColor whiteColor];
valueField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
valueField.adjustsFontSizeToFitWidth = YES;
valueField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
[cell.contentView addSubview : valueField];
//....
}
//....
valueField.text = [title1 objectAtIndex:count1];
//....
the first cell data is getting displayed in all the cells because when you initialize and create your reusable cell, you fill the data there, you need to initialize a reusable cell that doesnt have all its values set, and then set this information for each cell. That is, you need to have all the information you want for each particular cell outside the if(cell==nil) part of this code, and rely on the indexPath to know which cell you are in, and feed in different data based on this.
You seem to be constructing the subviews of the cell correctly when there is no reusable cell available. The question is, what does your code do when you do dequeue a reusable cell? It appears that you do nothing. You should move any row-specific initialization (setting label text values, images, etc.) outside the check for whether the dequeued cell is nil. In this way, whether you just constructed a new cell or dequeued a previously-created cell, the data being displayed correctly correlates to the row being displayed.
Well actually your code this way is quite hard to decode,
but first of all, you declare a lot of tag that should be used to retrieve the UIViews you're declaring.
Unfortunately these are all the same (tags) so you might never get what you want. You should maybe put in some constant in your header file like:
#define kPubLabel 100
then use them.
then you usually retrieve these after declaring your cell to populate them.
In the mean time, retrieving your images from url in this method is one of the best way to have your application being slow, since each time you scroll, you'll have to re-fetch your image from where it come from causing your table view to "freeze".
Finally, the only thing that might change, according to your code is the imageView that you add to your frame. You usually have an ImageView in which you put an image that you might have stored/cached but rarely change the contentView of a cell.
ie
Maybe you should externalize your cell building code in a class overriding UITableViewCell.
Put different tags on every element in your cell to retrieve them in your method.
Retrieve your elements in your method according to there tags.
Populate and only populate them in your method.
Retrieve your image once and for all for performance improval.
I'm not sure this will help, but in my point of view, there are actually a lot work to do in your code.
I parsed the XML data from a feed. I stored all data in NSArray. I loaded the images and title in UITableview using UILable. But when I use the scroll, the text will be collapsed as follows.
My code is as follows...
-(UITableViewCell *)tableView:(UITableView *)tableView1 cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView1 dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil){
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
CGRect frame = CGRectMake(70.0, 00.0, 250.0, 55);
valueField = [[UILabel alloc] initWithFrame:frame];
[valueField setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
valueField.tag = 111;
valueField.font=[UIFont fontWithName:#"Helvetica" size:13.0];
valueField.textAlignment = UITextAlignmentLeft;
valueField.lineBreakMode=UILineBreakModeWordWrap;
valueField.numberOfLines = 0;
valueField.textColor = [UIColor whiteColor];
valueField.text=[title1 objectAtIndex:indexPath.row];
valueField.highlightedTextColor = [UIColor whiteColor];
valueField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
valueField.adjustsFontSizeToFitWidth = YES;
valueField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
[cell.contentView addSubview:valueField];
[valueField release];
UIImage *patternImage = [UIImage imageNamed:#"bg.jpg"];
UIView *backView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
backView.backgroundColor = [UIColor colorWithPatternImage: patternImage];
cell.backgroundView = backView;
NSString *image1 =[images objectAtIndex:indexPath.row];
NSLog(#"Images ..... = %#",image1);
NSData *mydata = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[images objectAtIndex:indexPath.row]]];
UIImage *myimage = [[UIImage alloc] initWithData:mydata];
UIImageView *imageView = [ [ UIImageView alloc ] initWithImage: myimage ];
imageView.frame = CGRectMake(0.0f, 00.0f, 60.0f, 63.0f);
[cell.contentView addSubview:imageView];
//cell.imageView.image = myimage;
return cell;
}
I don't know how to solve this issue.
Every time the cell is reloaded, the UILabel is added.
Do something like
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
CGRect frame = CGRectMake(70.0, 00.0, 250.0, 55);
valueField = [[UILabel alloc] initWithFrame:frame];
[valueField setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
valueField.tag = 111;
valueField.font=[UIFont fontWithName:#"Helvetica" size:13.0];
valueField.textAlignment = UITextAlignmentLeft;
valueField.lineBreakMode=UILineBreakModeWordWrap;
valueField.numberOfLines = 0;
valueField.textColor = [UIColor whiteColor];
valueField.highlightedTextColor = [UIColor whiteColor];
valueField.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
valueField.adjustsFontSizeToFitWidth = YES;
valueField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
[cell.contentView addSubview:valueField];
[valueField release];
}
valueField.text=[title1 objectAtIndex:indexPath.row];
To be more specific, since you are dequeuing cells, when you call cellForRowAtIndexPath it potentially can return you a cell that was already created.
That cell already has a label created.
So all of the magic of creating and setting up the custom views in you cell should only be done when dequeueReusableCellWithIdentifier returns a nil value