i want to display multiple lines in a Table's cell view for an IOS app that i'm working on. To be precise, i have a table view which will be populated with the JSON data that is returned from server, in here if the status returned is 0 or 2 (Status is one of the JSON object that is being returned for a profile) i have to display an error message that is of 5-6 lines.
Table's cell view is customized to display 2 UILabel's and obviously the height of this cell is small enough to display 2 labels. I found one solution, but it doesn't actually solve the problem. Can anyone suggest a different solution. If possible, link to an example will be a great help. Thanks
What you're searching for is called "dynamic sized" cells. There is a tutorial on how to realize this : http://www.raywenderlich.com/73602/dynamic-table-view-cell-height-auto-layout
It does resize all cells height in function of the text length like in this example:
if you have to show this multi lines message to one of the UILabels you currently have in UITableViewCell, then set the property "No of Lines" to 0 (Zero) and set "Line Mode" to UILineBreakModeWordWrap, Now for height of the cell you have two options i.e with contraints or without constraints, this will be done using cellForRowAtIndexPath method.
1.if (error_message_shown) {
return 200.0;
else
return 60.0;
With constraints
Add top, bottom, left, right, width and height constraints, ensure to use >= for height and calculate the height of the text assigned to the cell using below method
CGSize size = [string sizeWithAttributes:
#{NSFontAttributeName:
[UIFont systemFontOfSize:17.0f]}];
When I have dynamic cell height I use something like
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
static MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"my_cell_id"];
NSDictionary *responseItem = [self itemFor:indexPath];
return (CGFloat)[cell heightFor:responseItem];
}
Related
I'm using iOS 9.2 and XCode 7.2.
I have a basic UITableView object in which i add different kind of UITableViewCell subclasses.
With one of them, when i set manually the height overriding the method heightForRowAtIndexPath, i don't get any content on the cell.
If i return -1 as height(the default value for the UITable row height), i get my cell showing up correctly. The thing is that i do need a different height for this row because the content is quite big.
here is the code for heightForRowAtIndexPath:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
MenuItem *menuItem = [menuManager menuItemAtIndex:indexPath.row];
if ([menuItem type] == MenuItemTypeEditorHeader) {
return 100;
} else {
return [super tableView:tableView heightForRowAtIndexPath:indexPath];
}
}
MenuItem is a class containing the specific menu object' informations, such as the type. The result is that the cell is showed up at the correct height, but it's empty.
Its not advisable to use heightForRowAtIndexPath anymore - thats old-school. Instead, do this :
Set up autolayout constraints in your cell (if you dont know how to - you need to, its not something you can avoid anymore!)
Create an estimatedRowHeight for autolayout to use, on the tableView. You can set it in the nib/storyboard or programmatically, in viewDidLoad for eg, like this :
self.tableview.estimatedRowHeight = 68.0;
Set your tableview to use 'automatic dimension', like this :
self.tableview.rowHeight = UITableViewAutomaticDimension;
And thats it. If you do these things, then your cells will vary in height according to their constraints. So if one of your subclasses has a height of 150px due to its constraints, that will work perfectly next to another subclass that has a height of 50px. You can also vary the height of a cell dynamically depending on the contents of the cell, for eg when you have labels that expand using 'greater than or equal to' constraints. Also - simply omit the 'heightForRowAtIndexPath' method, you dont need to implement it at all.
Are you calling tableView.reloadData() ?
print the length of menu objects before you call tableView.reloadData().
HeightForRowAtIndexPath just returns height of a row. So may be problem in cellForRowAtIndexPath.
There's more content in my Table View, but this cell is getting cut off and not showing more content:
... So I'm not able to scroll any more, even there is more content.
If I pull up with my finger it shows more content, but then when I let my finger off the cell it goes back to the state show in the image above.
I've tried making sure I set height and width in the Labels and Images in AutoLayout since I thought that might be a problem, but still hasn't fixed it.
Any ideas? Thanks!
UPDATE - Table View structure in Storyboard
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
id model = self.model[indexPath.row];
if ([model isKindOfClass:[DBase self]]) {
return 520;
}
else {
return tableView.rowHeight; // return the default height
}
}
I was having this problem as well but mine was only cutting off a single cell. I solved it and thought I'd post this here as it may help others in the future
I was using custom cells created from nibs. Some of my cells could change heights so I was also using this:
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 61
I figured out the issue was that I was setting top, left, right and height constraints on my view. I needed to set the bottom constraint as well or else my row height would be way smaller than it should be.
So if you are having this problem check if your row heights aren't smaller than the views that they contain.
I suggest adding height and width constraints to your UITableViewContoller or UITableView in the storyboard.main.
Depending on the size of your device, the UITableView size will remain constant unless you set constraints that will work across all devices.
I am now followind maybe a bit obsolete tutorial from iOS Apprentice regarding geolocation.
Anyway the job to be done seems extremly easy:
placing text view inside table view cell. On storyboard everything looks greate but when I run it, it looks like presented on picture below (the textview covers the below category table cell view item):
I have following settings:
What is the best way to keep textview inside the table view cell and text just wraps, and overllay-y (so it is called in CSS - I am newbie to iOS) will be added to textview?
I agree with #railwayparade you should use
cell.textLabel.numberOfLines = 0;
Use heightForRowAtIndexPath to calculate the size the cell needs to be
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// replace "THE_TEXT" with the text you are displaying and "TEXT_LABEL_FONT" with the font you're using in the cell
CGSize size = ["THE_TEXT" sizeWithFont:"TEXT_LABEL_FONT" constrainedToSize:CGSizeMake(self.table.bounds.size.width, HUGE_VALF) lineBreakMode:NSLineBreakByWordWrapping];
return size.height;
}
You might want to subclass UITableViewCell and override layoutSubviews to set the textLabel to the exact right size, and add padding as you see fit
-(void)layoutSubviews // in your UITableViewCell subclass
{
[super layoutSubviews];
self.textLabel.frame = CGRectMake(0.0f,0.0f,self.contentView.bounds.size.width,self.contentView.bounds.size.height);
}
Don't forget if you do add padding on the width in layout subviews, you'll have to change the constrained width in heightForRowAtIndexPath
The Goal
I'm trying to create a dynamic message cell using auto-layout.
What I've Tried
The cell is positioning correctly, for the most part, with auto-layout given the following constraints:
The Problem
My first problem was the message label (Copyable Label) width was constrained. That seems to be resolved by using setPreferredMaxLayoutWidth: as described in this question.
Height is still a problem. As you can see, the message bubble is still cutting off. In addition, I'm not sure how to determine the message cell height for the table view.
I expected auto-layout to somehow just work. I've read the answer here, but it seems like a lot to of steps.
The Question
First, is a case where auto-layout is more complex than traditional frame arithmetic?
Second, using auto-layout, how can I determine the height of the resulting cell?
I fully use Auto Layout and what you speak about is kinda a problem.
I didn't want to modify the way intrinsic size is calculated for performance purpose of UITable.
So I used a very simple way that is correct in the end. It's ok if your cell is simple, can become such hard if your cell contains more than one variable text.
I defined my cells normally, where you can put a UILabel that fits the insets (no problem about it).
Then, in your table datasource, you define directly the height of the cell:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return [TEXTOFYOURCELL sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, 1000)].height + 31; // Here it's defined for 15 of top and bottom insets, define +1 than the size of the cell is important.
}
EDIT :
Here some code about the UILabel in the cell (in init method).
__titleLabel = [UILabel new];
__titleLabel.numberOfLines = 0;
[self.contentView addSubview:__titleLabel]; // adding to contentView rather than self is very important !
[__titleLabel keepInsets:UIEdgeInsetsMake(0, 15, 0, 15)];
I use this API : https://github.com/iMartinKiss/KeepLayout to manage auto layout simpler.
This is possible on iOS 8 as can be read on AppCoda
Basically:
Set the label lines to 0.
Set the row height UITableViewAutomaticDimension
I have a UITableViewCell that is implemented using storyboard that looks like:
Here is what the cell should look like without an image:
I have been fiddling with the constraints and banging my head trying to figure this out but have had no luck. I have a pretty good understanding of constraints and how to add them programmatically but have had no luck with this specific problem and feel like I am just adding layout constraints to the cell willy-nilly with no logical thought process. The cell represents a newsfeed post which may or may not have an image in the main image view at the top, and should behave as follows. If the cell doesn't have an image in it the bottom bar with the like and comment counts, moves up to align with the top of the cell. I achieved this behaviour by setting a constraint that kept the smaller image view, post title, post time and the post content a set distance away from the bottom of the cell. This approach works and when the cell is resized in the heightForRowAtIndexPath method the subviews move appropriately. The problem comes when the text in the post content is larger then a single line. The height of the cell adjusts correctly but the top of the text view stays at the same location and grows downward and overflows into the next cell. When I place the constraints to align the four subviews with the top of the cell I run into issues when there is no image and the post content is larger then a single line. In this case, the cell resizes to be smaller than its original size and the subviews stay at the distance specified by the constraint. The smaller image, post title, time and content are clipped and don't display. This is such an odd problem with so many different cases. I have been working at this for almost two days and could really use someone else's thoughts on how to solve this issue. I hope this isn't too confusing, thanks for the help!
I have one way to solve this, but I'm sure there are many others. I gave both image views a fixed height constraint. The small image view and the top label (Post Title) have fixed heights to the top of the cell -- both of these as well as the height constraint of the large image view have IBOutlets to them so they can be changed in code. The bottom label (Post Content) has its number of lines set to 0, and has an IBOutlet to its height constraint (all the labels had the standard 21 point height to start). In code, I check for the existence of an image at each indexPath, and change the constraints accordingly.
- (void)viewDidLoad {
UIImage *image1 = [UIImage imageNamed:#"House.tiff"];
[super viewDidLoad];
self.theData = #[#{#"pic":image1, #"post":#"short post"},#{#"post":#"short post"},#{#"pic":image1, #"post":#"Long long post with some extra stuff, and even some more"},#{#"post":#"Long long post with some extra stuff, and even some more"}];
[self.tableView reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.theData.count;
}
-(CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
CGFloat ivHeight = (self.theData[indexPath.row][#"pic"])? 215 : 0; // 215 is the fixed height of the large image view
CGSize labelSize = [self.theData[indexPath.row][#"post"] sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(152, CGFLOAT_MAX)];
return 140 + ivHeight + labelSize.height; // the 140 was determined empirically to get the right spacing between the 3 labels and the bottom bar
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
RDCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.label.text = self.theData[indexPath.row][#"post"];
cell.iv.image = self.theData[indexPath.row][#"pic"];
if(self.theData[indexPath.row][#"pic"] == nil){
cell.heightCon.constant = 0; // heightCon is the outlet to the large image view's height constraint
cell.ivTopCon.constant = 8; // ivTopCon is the outlet to the small image view's spacing to the top of the cell
cell.labelTopCon.constant = 8; // labelTopCon is the outlet to thetop label's spacing to the top of the cell
}else{
cell.heightCon.constant = 215; // this number and the following 2 are taken from the values in IB
cell.ivTopCon.constant = 185;
cell.labelTopCon.constant = 233;
}
CGSize labelSize = [self.theData[indexPath.row][#"post"] sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(152, CGFLOAT_MAX)];
cell.labelHeightCon.constant = labelSize.height;
return cell;
}
Hey #rdelmar thanks for the solution! Eventually I ended up just designing two different cells in the storyboard file with different reuse identifiers but the same subclass. I then checked in the cellForRowAtIndexPath method if the cell had content or not, and assigned the correct identifier. If this is the incorrect way of doing this, or will cause problems down the road please let me no in the comments.