I need to add a bevel to my UITableViewCell's (white line on top, dark line on bottom). I already have a CAGradientLayer added as a subview of my cell.layer. Unfortunately I can't use a UIImageView as a background for my cells, so this will need to be done in code. Any suggestions? Thanks!
This is the code I have now for my cell background.
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = cell.frame;
gradientLayer.colors = [NSArray arrayWithObjects:
(id)[[UIColor colorWithRed:0.988 green:0.988 blue:0.988 alpha:1.0] CGColor],
(id)[[UIColor colorWithRed:0.9294 green:0.9294 blue:0.949 alpha:1.0] CGColor],
nil];
[cell.layer insertSublayer:gradientLayer atIndex:0];
This looks fine, but I would like to have a 1 pixel dark line on the bottom and a 1 pixel white line on the top to finish the look.
You can, and probably should use a UIImageView as the cell background. What you are currently doing is actually quite wrong.
A UITableViewCell consist of quite a few views in a hiarchy, it is important to know where you are supposed to hook in your views. This hierarchy is as follows:
UITableViewCell - Never touch this
backgroundView - Replace set your custom background for all rows.
selectedBackgroundView - Replace to set a custom background for selected/highlighted rows.
contentView - Do not set this but feel free do add as many subviews as you like.
titleLabel
detailTitleLabel
imageView
Your own views
accessoryView
It is not obvious from the start how to replace the backgroundView and the selectedBackgroundView. The UITableView itself will set these automatically after you have returned the cell from the -[tableView:cellForRowWithIndexPath:] datasource method. Meaning anything you set there will always be overridden.
The trick is to implement the -[tableView:willDisplayCell:forRowAtIndexPath:] delegate method, and set your custom background here.
All this is quite well explained in the Table View Programming Guide.
Have a look at this link. You can ignore the gloss effect, but otherwise I think it's what you want.
Related
I have written drawRect as follows.
-(void)drawRect:(CGRect)rect
{
[super drawRect:rect];
CGContextRef cxt = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(cxt, 2.0);
CGContextSetStrokeColorWithColor(cxt, [UIColor redColor].CGColor);
CGContextMoveToPoint(cxt, 250.0 , 0.0);
CGContextAddLineToPoint(cxt, 250.0, 50.0);
CGContextStrokePath(cxt);
}
It draws red line. But When I set background view to cell line disappears. I have set view as follow.
UIView *view = [[UIView alloc] initWithFrame:cell.frame];
view.backgroundColor = [UIColor grayColor];
cell.backgroundView = view;
What is the problem? How backgrond view hides the line?
Please help
I guess you are in a UITableViewCell?
You should not overwrite drawRect of the cell itself. Instead put your drawing code in a custom backgroundView, or in a custom view within the contentView hierarchy. (depends on your planned result, probably backgroundView is correct for you)
The line is gone, because the backgroundView is a subview of the TableViewCell, so it is on top of the cell itself. (You can see this, if you use [UIColor colorWithWhite:0.0 alpha:0.5] as backgroundColor of your backgroundView.) There are many views on a UITableViewCell, it looks somewhat like this:
UITableViewCell
> BackgroundView
> (EditControl)
> ContentView
> (AccessoryView)
Agree with jaydee3 that you should not override UITableViewCell's drawRect, instead make your custom view class extending from UIView, extend drawRect there and do all the framing and coloring thing there, then set an instance of that view as your cell background view, its much better approach
When u already drawn background of that,u can't set background Color or image again for that cell.It overlays on what u drawn.
I have a UITableViewController that I'm trying to custom style. I've got 95% of the way there, but am having trouble removing an odd shading from the cell background. I've highlighted what I'm trying to remove in this screen shot:
To try and resolve this issue, I've dumped all the views that are composing my UITableView and then colored them to try and find the view I need to change:
As you can see, I've been unable to color that specific spot. Said differently, I can't find a view associated with that spot.
How do I remove that shading from my cells?
The table view is restarting the gradient behind each section, since it is just taking the colour you have given it.
Instead, use the backgroundView property of the table view - create an image view using your image, and set this as the background view, or create a UIView with background colour as you are doing above.
You will need to remove any code you have setting background colours elsewhere, and make sure your section header views either have clear backgrounds, or a contrasting background.
As a simple demonstration, I have created a grouped table view with its background colour set to clear, and the following code in viewDidLoad of the table view controller:
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *backgroundView = [[UIView alloc] initWithFrame:self.tableView.bounds];
CAGradientLayer *layer = [CAGradientLayer layer];
layer.colors = [NSArray arrayWithObjects:(id)[UIColor redColor].CGColor,(id)[UIColor whiteColor].CGColor, nil];
layer.frame = backgroundView.frame;
[backgroundView.layer addSublayer:layer];
self.tableView.backgroundView = backgroundView;
}
This gives the following (admittedly, pretty ugly!). The cells "float" on top of this.
How do I fill the background color of a UITableViewCell? I tried this code but it didn't work.
cell.backgroundColor = [UIColor redColor];
Try setting a backgroundView for UITableViewCell :
UIView *bgView = [[UIView alloc] init];
bgView.backgroundColor = [UIColor redColor];
cell.backgroundView = bgView;
// release object
[bgView release];
You can change the selection background view of UITableViewCell the same way.
cell.selectedBackgroundView = bgView;
Setting the background color though UITableViewCell's backgroundColor property only works in a Grouped table view. So if your table view is in the Plain style then it won't work.
You can of course set the background color of the UITableView's contentView. But then you probably have to do some additional work as the other subview (text labels and accessory views) have their own idea of background colors.
Take a look at the following snippet from the UITableViewCell documentation.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewCell_Class/Reference/Reference.html
Note: If you want to change the background color of a cell (by setting the background color of a cell via the backgroundColor property declared by UIView) you must do it in the tableView:willDisplayCell:forRowAtIndexPath: method of the delegate and not in tableView:cellForRowAtIndexPath: of the data source. Changes to the background colors of cells in a group-style table view has an effect in iOS 3.0 that is different than previous versions of the operating system. It now affects the area inside the rounded rectangle instead of the area outside of it.
That should solve your problem.
Apple's iPhone apps such as Music and Contants use a search bar in a UITableView. When you scroll down so that the search bar moves down, the empty space above the scroll view's contents has a light gray background color (see screenshot).
(Notice that the search bar has a slightly darker edge line at its top. This is not there for the default UISearchBar, but subclassing should take care of that.)
I tried setting the background color of the UITableView, but that affects the rows as well. Does anyone know how to achieve this effect? Am I going to have to override implement drawRect: or is there a built in way?
Setting transparencies is bad for performance. What you want is the gray area above the search bar, but it should still be white beyond the end of the list.
You can add a subview to your UITableView that lives above the content instead.
CGRect frame = self.list.bounds;
frame.origin.y = -frame.size.height;
UIView* grayView = [[UIView alloc] initWithFrame:frame];
grayView.backgroundColor = [UIColor grayColor];
[self.listView addSubview:grayView];
[grayView release];
You could add more fancy stuff to the view if you like, perhaps a fade, or a divider line without subclassing UISearchBar.
This is one of my very favorite tricks.
UIView *topview = [[[UIView alloc] initWithFrame:CGRectMake(0,-480,320,480)] autorelease];
topview.backgroundColor = [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:238.0/255.0 alpha:1];
[self.tableView addSubview:topview];
Basically you're creating a big view the size of the screen and placing it "above" the content area. You'll never be able to scroll up past it.
And don't worry about the memory impact of a UIView that's 320x480 pixels, it won't consume any significant memory because the CALayer doesn't have any meaningful content.
NOTE: Why is this answer relevant when the "accepted" answer is so much simpler? Why not just set the backgroundView on the table view? It's because, in the case of the Contacts app as shown in the original question, the area "above" the table view has a different background color (light blue) than the area "below" the table view (white). This technique allows you to have two different colors above and below the table view, which cannot be accomplished by a simple background.
EDIT 1/2018: As Tom in the comments pointed out, this answer is quite old and assumes that all iOS devices have the same screen size (seems crazy but it was the case in 2009 when I answered this). The concept I present here still works, but you should use UIScreen.main.bounds to figure out the actual screen size, or you could get into some fancy auto layout stuff (suggestions welcome). I don't recommend using tableView.bounds as in another answer, because typically in viewDidLoad the size of your views is not necessarily the size that they will become after the controller resizes them. Sometimes they start out as 0x0!
To extend on HusseinB's suggestion:
Swift 3
let bgView = UIView()
bgView.backgroundColor = UIColor.white
self.tableView.backgroundView = bgView
Objective C
UIView *bgView = [UIView new];
bgView.backgroundColor = [UIColor whiteColor];
[self.tableView setBackgroundView:bgView];
As of iOS 7, you can tinker this by changing the tableview background view.
[self.tableView setBackgroundView:view];
make the view's background colour the same as your parent view colour.
This code works in Swift fot UITableView:
var frame = self.tableView.bounds
frame.origin.y = -frame.size.height
frame.size.height = frame.size.height
frame.size.width = UIScreen.mainScreen().bounds.size.width
let blueView = UIView(frame: frame)
blueView.backgroundColor = UIColor.headerBlueColor()
self.tableView.addSubview(blueView)
In Swift (tested on iOS9)
let backView = UIView(frame: self.tableView.bounds)
backView.backgroundColor = UIColor.clearColor() // or whatever color
self.tableView.backgroundView = backView
EASIEST SOLUTION
The easiest way to create different colors in the bottom and in the top of a bouncing area of a table view is to set the key tableHeaderBackgroundColor of the table view. Doing this way you set the top color. I'm not sure, but maybe there is another key for the footer, take a look. If you don't find anything, you just have to set the background of the table view with the color that you want to show in the bottom. Above you can see an example code:
self.table.setValue(UIColor.blue , forKey: "tableHeaderBackgroundColor")
Hope it help you. If yes, let other people know about this easy way giving an up in the answer :)
I've only found one way to do this. You have to set the backgroundColor of the UITableView to be transparent, set the backgroundColor of the cell's contentView to whatever colour you want the actual cells to be, then crucially you have to get the light grey colour to appear behind the UITableView. That last step you can do by either setting the backgroundColour of the UIWindow, or of whatever is containing or your tableViewController.
So, assuming you have a view controller that is derived from UITableViewController, insert these lines in the -(void)viewDidLoad method:-
// sets the background of the table to be transparent
self.tableView.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.0];
// assuming we are inside a navigation or tab controller, set the background
self.parentViewController.view.backgroundColor = [UIColor lightGrayColor];
Then inside the part of tableView:cellForRowAtIndexPath: that creates new cells, add:-
// set an opaque background for the cells
cell.contentView.backgroundColor = [UIColor whiteColor];
I just encountered this issue myself and found a solution.
Cause
I used Spark Inspector to examine the layout of the table view - which really helped.
Thing is, that in this scenario the UITableView has 3 subviews:
UITableViewWrapperView
UIView - With backgroundColor set to light gray color
UISearchBar
While you swipe the tableview content downwards, the second subview height is dynamically increasing to fill the space between the UITableViewWrapperView and the UITableView frame origin.
Solution
Setting the backgroundColor or backgroundView property won't effect the 2nd subview.
What you need to do is find the second view and change its color, like so:
if (_tableView.subviews.count > 1) {
_tableView.subviews[1].backgroundColor = THE_TARGET_COLOR;
}
In my case I needed all views to be white so I used the following which is less prone to future changes of UITableView view hierarchy by Apple:
for (UIView *subview in _tableView.subviews) {
subview.backgroundColor = [UIColor whiteColor];
}
I will give you the best way to do this.
First set the background color of the table view to the one you want in interface builder.
Then respond to the UITableView delegate tableView:willDisplayCell:ForIndexPath: method
like this
- (void)tableView:(UITableView*)tableView willDisplayCell:(UITableViewCelll*)cell forIndexPath:(NSINdexPath*)indexPath
{
[cell setBackgroundColor:[UIColor whiteColor]];
}
Another Method is :
in ViewDidLoad method (or anywhere you like) set the tableView background color to clear color like this:
self.tableView.backgroundColor = [UIColor clearColor];
and then set the superview color to white
self.tableView.superview.backgroundColor = [UIColor whiteColor];
I don't think you want to override drawRect. Most likely what you're seeing is the background colour of another view or the window, which lies "behind" (i.e. is a superview of) the table view. There's usually a fairly complex layers of UIViews in Apple's UI widgets. Explore the view hierarchy in GDB, look at [myView superview] and then [someSuperView subviews] and try manipulating their BG colours in the debugger to see if you can find which one it is. However, if you implement a fix this way, be warned that it may not be future compatible.
You might also try setting the BG colour of one of the views behind the tableview in Interface Builder (or of the window itself).
If you are using a tableviewcell, you can set the view background to be opaque white. Then use
self.tableView.backgroundColor = [UIColor grayColor];
in the view did load method.
I'm sure that that is [UITableView backgroundColor].
You have affected rows, because rows have backgroundColor == clear (or semi-transparent).
So, If you'll make rows non-trasparent, all will work fine.
This will be solution.
I followed the tip outlined by Peylow, for a UITableView, by simply adding a subview. My only change from the code was to grab a color a bit closer to the one used in Apple apps, plus I got it a bit closer to Apple's look of having a line above the UISearchbar by reducing the frame origin y coordinate by one pixel:
frame.origin.y = -frame.size.height - 1
For anyone who's wondering how to do the same for the bottom bounce area:
First add a subview with your desired background color to your table view's background view:
self.bottomView = [[UIView alloc] initWithFrame:CGRectOffset(self.tableView.frame, 0, self.tableView.frame.size.height)];
self.bottomView.backgroundColor = whateverColorYouLike;
[self.tableView.backgroundView addSubview:self.bottomView];
And then in your table view's delegate:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGRect frame = self.bottomView.frame;
frame.origin.y = self.tableView.contentSize.height - self.tableView.contentOffset.y;
self.bottomView.frame = frame;
}
In my case the solution was to create a headerview for the table and assign a color, it solved the black background in bounce area in my apps when in dark mode. I did the same to its tableFooterView.
table.tableHeaderView = UIView()
table.tableHeaderView!.backgroundColor = UIColor.white
How can I set the background of UITableView (the tableview style is "Grouped") to use an image?
In newer versions of the SDK, you'll need to set tableView.backgroundView if you want it to be transparent, try something like this:
tableView.backgroundColor = [UIColor clearColor];
tableView.opaque = NO;
tableView.backgroundView = nil;
We need to do something about that plain background. We're going to use a PNG image and display it behind the UITableView.
Prepare a PNG image. It should be either 320x460 (if you have the status bar visible in your app) or 320x480 (if you hide it).
Drag it into XCode into the Resources folder and add to your project
Load the NIB file containing your UITableView into Interface Builder
Open the library (Tools> Library), switch to the Media tab, and drag the image to the View, create a new UIImageView.
Use the inspector to move and resize the image so it's at X=0, Y=0, Width=320, Height=480
Put the UIImageView behind the UITableView (Layout > Send to Back)
Save, Build and Go!
Disappointingly, you won't be able to see your background. The UITableView's background is blocking us from seeing the UIImageView. There are three changes you need to make:
In the Attributes Inspector, make sure the UITableView's "opaque" checkbox is unchecked!
Set the UITableView's background color to transparent:
tableView.backgroundColor = [UIColor clearColor];
I hope this helps and solves your problem. It has worked for me and I have yet to find a more elegant way to display a background image for a UITableView.
The advantage of my solution, in comparison with setting a background image directly on the UITableView, is that you can indent the table's content. I often wanted to do this to just show two or three table cells at the bottom of the screen.
[tableView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:#"whatever.png"]]];
tableView.backgroundView = nil;
is enough. No need to set background color as Clear Color.
One way would be to make the table view transparent (set the view's background to 0% opacity) and place a UIImageView behind the UITableView. Remember that transparent tables and table cells will not perform as well as opaque ones.
In UI Builder the Background color has an "Other" choice.
This brings up a color picker.
The color picker has an opacity setting.
If you set the Opacity of the COLOR to 0 it works, can't speak to performance.
What I've found is that you have to use a "plain" styled table with a transparent background and then recreate the look of the rounded-corner cells by setting each cell's backgroundView to a UIImageView with a image that simulates the rounded look. This means that the top, bottom, and middle cells need different background images.
However, this does not address what happens when the user taps the cell and it goes "highlighted" - it will look squared off then. You can get around this by setting the highlighted image for your faked tablecell background image. You will also want to create your own disclosure accessory view (ImageView) with a white highlighted version. Then you can create a cell like this one I'm using (below). After I alloc one of these cells I then set the backgroundView and accessoryView to my UIImageViews.
#import "ClearBackRoundedTableCell.h"
#implementation ClearBackRoundedTableCell
- (id)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
if (self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier]) {
}
return self;
}
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated
{
if( [[self.accessoryView class] isSubclassOfClass:[UIImageView class]] )
((UIImageView *)self.accessoryView).highlighted = highlighted;
if( [[self.backgroundView class] isSubclassOfClass:[UIImageView class]] )
((UIImageView *)self.backgroundView).highlighted = highlighted;
self.textLabel.highlighted = highlighted;
}
#end
One note if you go this route: the cells in a grouped table are typically 300 px wide (in portrait mode) but your plain table here would need to be 302 wide to allow for the grey line on each side of the table, which is normally outside of the "content" of the table cell.
After spending a while with color picker, I found out that you need to specify opaque background not for the table view cell xib, but for the Table View where the cells will be located, which is another xib. From what I have seen, table view cell background attributes have no visual effect.
try this one
UIView *backView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease];
backView.backgroundColor = [UIColor clearColor];
cell.backgroundView = backView;
It worked for me in grouped tableview.
Make UITableview background as clear color.
Programmatically you can do it like this if your image is added into your resources:
self.tableView.backgroundColor = [UIColor clearColor];
self.tableView.opaque = NO;
UIImage *backroundImage = [UIImage imageNamed:#"my_backround"];
UIImageView *backroundImageView = [[UIImageView alloc] initWithImage:backroundImage];
Else you can do it in Interface Builder with this style :
You may need to configure the header files interface from UITableViewController to UIViewController and add <UITableViewDataSource,UITableViewDelegate> ,also don't forget to set the attributes of the tableview to not be opaque and reconnect the tableviews datasource and delegate outlets to the viewcontroller.