I am trying to add gradient layer behind the UILabel's text which resides in a custom UITableViewCell. Problem is that gradient is hiding my label's text. I have already visited this link, but it is not working for me.So how can I add it behind the text layer?
What I have done so far is:
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = CGRectMake(0, 0, buyPrice_port.frame.size.width, buyPrice_port.frame.size.height);
gradient.colors = [NSArray arrayWithObjects:(id)gainBackgroundColor1, (id)gainBackgroundColor2, nil];
gradient.locations = [NSArray arrayWithObjects: [NSNumber numberWithFloat:0.00], [NSNumber numberWithFloat:0.70] , nil];
[buyPrice_port.layer insertSublayer:gradient atIndex:0];
buyPrice_port.textColor = [UIColor blackColor];
You can simply add a view behind the UILabel (i.e. add the label as a subview of the gradient view) and keep the label transparent.
Related
I want to create a view which should have a glass like effect. It should look shining as well.
On that i want to add a UITextView which should appear transparent. I'm new to IPhone and not getting how to do this.
I don't want to add image. Wanna do programmatically. The view should look like as if it is a mobile screen.
Thanks
You'll have to do things if you don't want to use the image.
Add one UIView Use this code. And set gradient background color to it. Which will give you shiny glass like effect.
Here is the code:
.h file :
UIColor *pinkDarkOp;
UIColor *pinkLightOp;
CAGradientLayer *gradient;
.m file :
img_TopBarView = [[UIView alloc]initWithFrame:CGRectMake(0.0,0.0,1024.0,50.0)];
img_TopBarView.userInteractionEnabled = YES;
pinkDarkOp = [UIColor colorWithRed:15.0f/255.0 green:138.0f/255.0 blue:216.0f/255.0 alpha:1.0];
pinkLightOp = [UIColor colorWithRed:12.0f/255.0 green:91.0f/255.0 blue:183.0f/255.0 alpha:1.0];
gradient = [CAGradientLayer layer];
gradient.frame = [[img_TopBarView layer] bounds];
gradient.colors = [NSArray arrayWithObjects:(id)pinkDarkOp.CGColor,(id)pinkLightOp.CGColor,nil];
gradient.locations = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f],[NSNumber numberWithFloat:0.7],nil];
[[img_TopBarView layer] insertSublayer:gradient atIndex:0];
[self.view addSubview:img_TopBarView];
[img_TopBarView release];
You have to take the values of pinkDarkOp and pinkLightOp as per your need. You can get this color code anywhere on google.
For eg : http://gradients.glrzad.com
For Creating the transparent UITextView you can use the alpha property of the UITextView.
I hope this helps.
I have the following code to create gradient button:
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = btnSignUp.layer.bounds;
gradientLayer.colors = [NSArray arrayWithObjects:
(id)[UIColor colorWithWhite:1.0f alpha:0.1f].CGColor,
(id)[UIColor colorWithWhite:0.4f alpha:0.5f].CGColor,
nil];
gradientLayer.cornerRadius = btnSignUp.layer.cornerRadius;
[btnSignUp.layer addSublayer:gradientLayer];
However, the bottom rounded corners are painted over too. I can't figure out why this happens. Any ideas?
Here is the picture: http://imageshack.us/a/img546/509/btnw.png
If you're targeting iOS 5.0 or higher, you may want to create a PNG file of the gradient and stretch it to fill the button's background instead of messing with a layer. I believe the performance impact of using a PNG is better.
So something like:
static UIEdgeInsets insets = {15, 15, 15, 15}; (or whatever your insets are)
UIImage* image = [[UIImage imageNamed:#"myImage"] resizableImageWithCapInsets:insets];
[_button setBackgroundImage:image forState:UIControlStateNormal];
I think what you want is _button.layer.masksToBounds = YES;
I'm using...
NSArray *colors = [NSArray arrayWithObjects:(id) colorOne.CGColor, colorTwo.CGColor, nil];
CAGradientLayer *headerLayer = [CAGradientLayer layer];
headerLayer.colors = colors;
headerLayer.frame = self.button_editEntry.bounds;
[headerLayer setCornerRadius:10];
[self.button_editEntry.layer insertSublayer:headerLayer
atIndex:0];
... to get a linear fill happening on my button. The problem is when I animate the frame size (using UIView beginAnimations) the CAGradientLayer disappears and doesn't animate with the rest of the frame. Is there a reason this isn't working?
Is there a better way to do linear fades?
I added a CAGradientLayer on my UIImageView. I've set the autoresizing mask on the UIImageView to be flexible all across border (flexible height, width..etc). However the gradient layer that I added on top of my imageView doesnt resize when the UIImageView resizes. Why is this? Here's the code:
CAGradientLayer *imgOverlay = [CAGradientLayer layer];
CGColorRef startBlueColor = [UIColor colorWithRed:23/255.f green:171/255.f
blue:219/255.f alpha:0.8].CGColor;
CGColorRef endBlueColor = [UIColor colorWithRed:23/255.f green:171/255.f
blue:219/255.f alpha:0.5].CGColor;
imgOverlay.colors = [NSArray arrayWithObjects:
(id) startBlueColor,
(id) endBlueColor,
nil];
imgOverlay.locations = [NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.0],
[NSNumber numberWithFloat:1.0],
nil];
imgOverlay.startPoint = startPoint;
imgOverlay.frame = self.backgroundImageView_.bounds;
imgOverlay.endPoint = endPoint;
self.imageOverlay = imgOverlay;
[self.backgroundImageView_.layer addSublayer:self.imageOverlay];
CALayer does not support auto resizing on iOS. You must implement your resizing manually in layoutSubviews or wherever appropriate.
how would you go about overlaying a mask image of sorts on top of a UIScrollView?
For example, I have an image with black on the left and right fading to white in the center. I'd like to use this so that the items in my scroll view gradually fade out to the sides and the center item is completely opaque.
Also, the background of the view the scrollview is placed on is an image (not a solid color) which is dynamic and can change.
Any ideas?
Your question wound up being the best source I could find on the basic problem, so I decided to post my solution here.
If you add the mask directly to the scroll view, you wind up applying the mask to the content itself for some reason -- i. e. the transparency doesn't shift as you scroll. As per the suggestions of other posts, I put the gradient in a view over (or rather, containing) the scroll view. As a result, scrollContainer is a UIViewObject whose sole subview is the scroll view in question.
This mask is configured for left-to-right scrolling. You could change it to top to bottom by manipulating the start and end point properties of the gradient.
The one down side is that this also clips the scroll position bar indicator of the scroll view. Since my scenario doesn't need one, that's acceptable, but your mileage may vary.
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = scrollView.bounds;
gradient.colors = [NSArray arrayWithObjects:
(id)[[UIColor colorWithWhite:0 alpha:0] CGColor],
(id)[[UIColor colorWithWhite:0 alpha:1] CGColor],
(id)[[UIColor colorWithWhite:0 alpha:1] CGColor],
(id)[[UIColor colorWithWhite:0 alpha:0] CGColor], nil];
gradient.locations=[NSArray arrayWithObjects:
[NSNumber numberWithFloat:0],
[NSNumber numberWithFloat:.1],
[NSNumber numberWithFloat:.9],
[NSNumber numberWithFloat:1], nil];
gradient.startPoint=CGPointMake(0, .5);
gradient.endPoint=CGPointMake(1, .5);
[scrollContainer.layer setMask:gradient];
If you have a solid color background behind the scrollview, you'll get better performance by just overlaying an image on top of the scroll view rather than trying to perform a mask within it.
Try something along these lines:
// I assume you are in a UIViewController and self.view is set to some kind of view
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 420)];
scrollView.backgroundColor = [UIColor redColor];
[self.view addSubview: scrollView];
[scrollView release];
// add img with gradient
UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"my-gradient.png"];
imgView.frame = CGRectMake(0, 0, 160, 420);
[self.view addSubview: imgView];
[imgView release];
This would give you a gradient that begins on the left and goes all the way to the center for the entire height, assuming that "my-gradient.png" is an image that actually contains a gradient.
These kind of manipulations are big ressources consumers. The best approach would be (if your case allows it) to put a mask image OVER your UIScrollView. This image's background shoud be transparent (ex. png32) and the image should be an alpha-gradient.
Use insertView:yourView atIndex:0