I am trying to change the UILabel background color with this code
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
m_ShopName.text = m_CurrShop.m_Name;
m_ShopAddress.layer.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0].CGColor;
}
but nothing is happening.
This will help you
UILable *lbl = [[UILabel alloc]initWithFrame:CGRectMake(10,20,50,200)];
lbl.backgroundColor = [UIColor redColor];
Can you do this:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
m_ShopName.text = m_CurrShop.m_Name;
m_ShopAddress.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0];
}
I always did the following
m_ShopAddress.backgroundColor = [UIColor red];
When I wanted to change the alpha...
m_ShopAddress.alpha = 0.0f;
An alpha value of 0 means, it's fully transparent. That's probably why nothings happens (whatever you mean by that).
And I wouldn't access the background color of the layer, but of the UILabel directly.
If you are using a storyboard, check to see if you have a color for the view background in the storyboard. The view background color was overriding the layer color for me. I changed the background color for the view in the storyboard to default and this fixed it for me.
So I had the code:
func select() -> Void {
imageViewBackgroundView.layer.backgroundColor = UIColor.black.cgColor
cellImageView.layer.backgroundColor = UIColor.black.cgColor
cellLabel.layer.backgroundColor = UIColor.black.cgColor
cellLabel.textColor = UIColor.white
}
The cellLabel was the view background that was not changing. I had at one time set a background color for the view in the Storyboard. Once I changed the view background for the cellLabel to default the layer color took effect.
View Background
Related
Following setup:
i have a popupViewController that has a custom UIView subclass as its view, done in loadView
- (void)loadView
{
CGRect startingPopupSize = CGRectMake(0.0f, 0.0f, 300.0f, 160.0f);
_popupView = [[MoviePopupView alloc] initWithFrame:startingPopupSize];
self.view = _popupView;
}
in this UIView Subclass i have the following code in it's init method
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.layer.masksToBounds = YES;
self.layer.opaque = NO;
self.clipsToBounds = YES;
self.backgroundColor = [UIColor whiteColor];
self.layer.borderWidth = 1.0f;
self.layer.cornerRadius = 10.0f;
}
return self;
}
the problem is, the cornerRadius does not work for this view, but the border gets drawn, see here:
if i don't replace this view with the default uiview of the uiviewcontroller and instead add it as a subview, the cornerRadius works just fine (i want to replace it for several reasons).
any ideas why this is not working?
Edit:
if i just move the layers masksToBounds = YES property from the initWithFrame Method to the drawRect method it works. moving it to its viewcontrollers viewDidLoad doesn't.
- (void)drawRect:(CGRect)rect
{
// Drawing code
self.layer.masksToBounds = YES;
}
any ideas why this works? i think it is not the right place to set this property here.
You should make two views:
background view
text view
For background view set color you want for your text background.
For text view set background color as clear color.
I have a single image I want as the background for my app no matter what viewcontroller they are on - how do you accomplish this?
Here's how you set a background to an image:
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"Background.png"]];
Edit: To write up what Felixyz said (and thanks to Manni), do this in your delegate:
window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"Background.png"]];
And in each view you want to have the image, do this:
self.view.backgroundColor = [UIColor clearColor];
Depends on what sort of interface you have. Tabbed? Navigation based? But the general answer is: add a UIImageView to your UIWindow before/below your main view. Then make every view handled by your main view controller have a transparent background. Hard to give more specific advice without knowing if you use IB or not, or what your view hierarchy looks like.
In my app, I set a default background color. Maybe you can do this with you background image:
1.: Set the background color of your UIWindow in your AppDelegate:
window.backgroundColor = [UIColor myBackgroundGray]; // own Category
2.: And now, make all other views transparent:
self.view.backgroundColor = [UIColor clearColor]; // = transparent
In your AppDelegate in
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
Add this line :
[self.window setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:#"background.png"]]];
After you just have to set your views backgrounds to [UIColor clearColor];
I am not sure of the performance implications, but I needed to accomplish something similar, and ended up using a UIImageView which works well (in C#, but works the same in obj-c):
//Add the view controller first, to ensure proper order of views later.
Window.RootViewController = new UIViewController();
//create backdrop image view
var imageView = new UIImageView(Window.Bounds);
imageView.Image = UIImage.FromBundle("backdrop.jpg");
//insert into window.
Window.InsertSubview(imageView, 0);
This doesn't handle orientation changes, but in my case, allowed me to add motion effects to the backdrop (such as parallax).
Your background is a property of any View-inheriting object. Labels, Buttons, Controllers, and the app window, for example, all have backgrounds. If you want it to be completely a bg for the entire app you must climb the path in your controllers to find the very "top" (bottom-viewed) view, and set its background to be the image you desire.
just call this assignbackground in viewDidLoad
override func viewDidLoad() {
assignbackground()
}
func assignbackground(){
let background = UIImage(named: "background")
var imageview : UIImageView!
imageview = UIImageView(frame: view.bounds)
imageview.contentMode = UIViewContentMode.ScaleAspectFill
imageview.clipsToBounds = true
imageview.image = background
imageview.center = view.center
view.addSubview(imageview)
self.view.sendSubviewToBack(imageview)
}
I usually use this function to avoid overlaps with navigation bar on iphone.
-(void)setImageBackground:(NSString*)imageName{
UINavigationController* navigationController = [self navigationController];
float height = navigationController.toolbar.frame.size.height;
CGSize size = self.view.frame.size;
size.height = size.height;
UIGraphicsBeginImageContext(size);
CGRect bounds = self.view.bounds;
bounds.origin.y = bounds.origin.y + height;
bounds.size.height = bounds.size.height-height;
[[UIImage imageNamed:imageName] drawInRect:bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.view.backgroundColor = [UIColor colorWithPatternImage:image];
}
I have a main view with a picture on it.
I am trying to add a subview with [self.view addSubview:view2]; but I want the view2 background to be transparent. Have tried opaque=no and background color to clearcolor and also tried to subclass a uiview and rewrite the drawrect with:
#import "TransparentView.h"
#implementation TransparentView
- (id)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
[self setBackgroundColor:[UIColor clearColor]];
self.opaque=NO;
self.clearsContextBeforeDrawing=YES;
}
return self;
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClearRect(context, rect);
CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
CGContextFillRect(context, rect);
}
#end
But still doesn't display the background of the subview transparent... any ideas?
Try:
view.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.0];
view.opaque = NO;
Is the view being loaded from a nib file? If so, the -initWithFrame: won't be called; -initWithCoder: will be called instead. A better place to do this initialization might be in -viewDidLoad. But setting the background color to [UIColor clearColor] should definitely do the trick.
Try coloring the subview's background with a 0.0 for Alpha. That should make it completely transparent.
Something like this:
UIColor *myUIColor = [UIColor colorWithRed: 1.0 green: 1.0 blue: 1.0 alpha:0.0];
In the function
- (void)drawRect:(CGRect)rect
try to update
CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
to
const CGFloat BACKGROUND_OPACITY = 0.85; //Note: update this value to what you need
CGContextSetRGBFillColor(context, 1, 1, 1, BACKGROUND_OPACITY); // You can change 1,1,1 to the needed values
This link might help you
http://www.cocoawithlove.com/2009/04/showing-message-over-iphone-keyboard.html
I've had some cases where ... addSubview:clearView] seemed to reset the background color of clearView (WTF!) to something not clear. I added a
[clearView setBackgroundColor:nil];
somewhere after that and it seemed to help.
Okay, this question comes through a friend so it might be lost in translation...
Basically we need to change the color on a View. It appears to be stored in NSString format, but using a NSString to set the UIColor doesn't seem to do anything. In other words, if NSString color holds the value "redColor" then:
self.view.backgroundColor = color; //does nothing
Disclaimer: we are Objective-C/iPhone newbies.
Try
self.view.backgroundColor = [UIColor redColor];
You can also give RGB values like
self.view.backgroundColor = [UIColor colorWithRed:200/255.0 green:0/255.0 blue:67/255.0 alpha:1.0];
All the Best.
The color must be a UIColor object:
self.view.backgroundColor = [UIColor redColor];
like this also we can use
[self.view setBackgroundColor:[UIColor redColor]];
self.view.backgroundColor = [UIColor blueColor];
OR do like this
self.view.backgroundColor = [UIColor colorWithRed:180.0/256.0 green:180.0/256.0 blue:180.0/256.0 alpha:1.0];
The simplest way to add color programmatically is by using ColorLiteral.
Just add the property ColorLiteral as shown in the example, Xcode will prompt you with a whole list of colors which you can choose. The advantage of doing so is lesser code, add HEX values or RGB. You will also get the recently used colors from the storyboard.
Example:
self.view.backgroundColor = ColorLiteral
I know soft shadows are not supported by the UILabel out of the box, on the iPhone. So what would be the best way to implement my own one?
EDIT:
Obviously I will subclass the UILabel and draw in the -drawRect:
My question is, how do I get the contents of the label as graphics and draw around them, blur them etc...
EDIT 2:
I returned to this question about a year later. In the meantime I've built a class that allows you to easily add soft shadow to a label and tweak it's radius etc and also to draw gradients on the text itself. You can find it on GitHub: https://github.com/doukasd/iOS-Components/tree/master/Views
As of 3.2 there is direct support for shadows in the SDK.
label.layer.shadowColor = [label.textColor CGColor];
label.layer.shadowOffset = CGSizeMake(0.0, 0.0);
#import <QuartzCore/QuartzCore.h> and play with some parameters:
label.layer.shadowRadius = 3.0;
label.layer.shadowOpacity = 0.5;
And, if you find your shadow clipped by the label bounds:
label.layer.masksToBounds = NO;
finally set
label.layer.shouldRasterize = YES;
I advise you to use the shadowColor and shadowOffset properties of UILabel:
UILabel* label = [[UILabel alloc] init];
label.shadowColor = [UIColor whiteColor];
label.shadowOffset = CGSizeMake(0,1);
This answer to this similar question provides code for drawing a blurred shadow behind a UILabel. The author uses CGContextSetShadow() to generate the shadow for the drawn text.
Additionally to IIDan's answer:
For some purposes it is necessary to set
label.layer.shouldRasterize = YES
I think this is due to the blend mode that is used to render the shadow. For example I had a dark background and white text on it and wanted to "highlight" the text using a black shadowy glow. It wasn't working until I set this property.
Apply the (soft) shadow on the view's layer, like this:
UILabel *label = [[UIabel alloc] init];
label.layer.shadowColor = [[UIColor whiteColor] CGColor];
label.layer.shadowOpacity = 1.0;
To keep things up to date: Creating the shadow in Swift is as easy as that:
Import the QuartzCore Framework
import QuartzCore
And set the shadow attributes to your label
titleLabel.shadowColor = UIColor.blackColor()
titleLabel.shadowOffset = CGSizeMake(0.0, 0.0)
titleLabel.layer.shadowRadius = 5.0
titleLabel.layer.shadowOpacity = 0.8
titleLabel.layer.masksToBounds = false
titleLabel.layer.shouldRasterize = true
_nameLabel = [[UILabel alloc] initWithFrame:CGRectZero];
_nameLabel.font = [UIFont boldSystemFontOfSize:19.0f];
_nameLabel.textColor = [UIColor whiteColor];
_nameLabel.backgroundColor = [UIColor clearColor];
_nameLabel.shadowColor = [UIColor colorWithWhite:0 alpha:0.2];
_nameLabel.shadowOffset = CGSizeMake(0, 1);
i think you should use the [UIColor colorWithWhite:0 alpha:0.2] to set the alpha value.
I tried almost all of these techniques (except FXLabel) and couldn't get any of them to work with iOS 7. I did eventually find THLabel which is working perfectly for me. I used THLabel in Interface Builder and setup User Defined Runtime Attributes so that it's easy for a non programmer to control the look and feel.
https://github.com/MuscleRumble/THLabel
This like a trick,
UILabel *customLabel = [[UILabel alloc] init];
UIColor *color = [UIColor blueColor];
customLabel.layer.shadowColor = [color CGColor];
customLabel.layer.shadowRadius = 5.0f;
customLabel.layer.shadowOpacity = 1;
customLabel.layer.shadowOffset = CGSizeZero;
customLabel.layer.masksToBounds = NO;
I wrote a library that provides a UILabel subclass with soft shadow support and a bunch of other effects:
https://github.com/nicklockwood/FXLabel
In Swift 3, you can create an extension:
import UIKit
extension UILabel {
func shadow() {
self.layer.shadowColor = self.textColor.cgColor
self.layer.shadowOffset = CGSize.zero
self.layer.shadowRadius = 3.0
self.layer.shadowOpacity = 0.5
self.layer.masksToBounds = false
self.layer.shouldRasterize = true
}
}
and use it via:
label.shadow()
Subclass UILabel, as stated, then, in drawRect:, do [self drawTextInRect:rect]; to get the text drawn into the current context. Once it is in there, you can start working with it by adding filters and whatnot. If you want to make a drop shadow with what you just drew into the context, you should be able to use:
CGContextSetShadowWithColor()
Look that function up in the docs to learn how to use it.
As of iOS 5 Apple provides a private api method to create labels with soft shadows.
The labels are very fast: I'm using dozens at the same time in a series of transparent views and there is no slowdown in scrolling animation.
This is only useful for non-App Store apps (obviously) and you need the header file.
$SBBulletinBlurredShadowLabel = NSClassFromString("SBBulletinBlurredShadowLabel");
CGRect frame = CGRectZero;
SBBulletinBlurredShadowLabel *label = [[[$SBBulletinBlurredShadowLabel alloc] initWithFrame:frame] autorelease];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor whiteColor];
label.font = [UIFont boldSystemFontOfSize:12];
label.text = #"I am a label with a soft shadow!";
[label sizeToFit];
While it's impossible to set a blur radius directly on UILabel, you definitely could change it by manipulating CALayer.
Just set:
//Required properties
customLabel.layer.shadowRadius = 5.0 //set shadow radius to your desired value.
customLabel.layer.shadowOpacity = 1.0 //Choose an opacity. Make sure it's visible (default is 0.0)
//Other options
customLabel.layer.shadowOffset = CGSize(width: 10, height: 10)
customLabel.layer.shadowColor = UIColor.black.cgColor
customLabel.layer.masksToBounds = false
What I hope will help someone and other answers failed to clarify is that it will not work if you also set UILabel Shadow Color property directly on Interface Builder while trying to setup .layer.shadowRadius.
So if setting label.layer.shadowRadius didn't work, please verify Shadow Color for this UILabel on Interface Builder. It should be set to default. And then, please, if you want a shadow color other than black, set this color also through .layer property.
Subclass UILabel, and override -drawInRect: