I am having fun with Core Animation stuffs.
I needed to apply a pattern image to a CALAyer.
That part work perfectly with something like that:
color = UIColor(patternImage: UIImage(named: "myPatternImage")!
shapeLayer.fillColor = color.CGColor;
But now I need to apply a background color behind the pattern. my Patter image is a png (with alpha component).
So I want to apply a simple Color to the shape and after apply the pattern Image.
Is there a way to do that on the fly?
Just add another sublayer with background color and add it before your pattern background layer:
UIColor *backgroundColor = [UIColor redColor];
CALayer *solidBackgroundColorLayer = [[CALayer alloc] init];
solidBackgroundColorLayer.backgroundColor = backgroundColor.CGColor;
[[self layer] addSublayer:solidBackgroundColorLayer];
UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:#"MyPattern.png"]];
backgroundLayer = [[CALayer alloc] init];
[backgroundLayer setBackgroundColor:[color CGColor]];
[[self layer] addSublayer:backgroundLayer];
Related
i'm trying to make a UIImageView with rounder corner and white border, i have subclassed a UIImageView, this is the code:
MyUIImageView.h
#interface MyUIImageView : UIImageView
#end
MyUIImageView.m
#implementation MyUIImageView
-(void)layoutSubviews
{
self.layer.cornerRadius = CGRectGetWidth(self.frame)/2.f;
self.layer.borderColor = [[UIColor whiteColor] CGColor];
self.layer.borderWidth = kLineWidth;
self.layer.masksToBounds = YES;
self.clipsToBounds = YES;
self.contentMode = UIViewContentModeScaleAspectFill;
self.backgroundColor = [UIColor colorWithRed:0.82 green:0.82 blue:0.83 alpha:1];
}
#end
this is the result:
seems fine, but there is a problem as you can see from here:
the image pops out from the borders edge, how i can avoid this problem? how i can cut the image exactly at the edge of the border?
Perhaps a better solution doesn't involve making another View at all - with two views you greatly increase complexity for animation etc, not to mention overhead to keep track of and manipulate both.
I'd instead create a shape layer and add it as a sublayer. Something like this:
CAShapeLayer border = [[CAShapeLayer alloc] init];
border.path = [UIBezierPath bezierPathWithRoundedRect: self.bounds cornerRadius: self.layer.cornerRadius];
border.strokeColor = [UIColor whiteColor];
border.fillColor = [UIColor clearColor];
self.layer.addSublayer(border)
The benefit of doing it this way is that you can add it as a method on your UIImageView subclass if you wish. You can add a border to an object and forget about it, as long as you're not changing the frame of the base object. Transforms etc affect sublayers so you can scale, rotate, etc and not have gross edges.
Hope this helps!
Create a custom border like this:
UIImage *image = [UIImage imageNamed:#"spongebob.jpg"];
UIView *borderView = [[UIView alloc] initWithFrame:CGRectMake(30, 30, 200, 200)];
[borderView.layer setMasksToBounds:YES];
[borderView.layer setCornerRadius:borderView.frame.size.width/2.0f];
[borderView setBackgroundColor:[UIColor whiteColor]];
int borderWidth = 3.0f;
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(borderWidth, borderWidth, borderView.frame.size.width-borderWidth*2, borderView.frame.size.height-borderWidth*2)];
[imageView.layer setCornerRadius:imageView.frame.size.width/2.0f];
[imageView.layer setMasksToBounds:YES];
[imageView setImage:image];
[borderView addSubview:imageView];
[self.view addSubview:borderView];
Now you image does not pop out of the border.
Hope this helps :)
I'm trying to create movie generation application by using AVComposition and have a trouble in making title frame.
Each frame is actually a calayer and title layer is on top of other frames.
Title(Text) needs to be transparent with black background so that they can see some part of the first content frame under title text letters.
I searched most articles about calayer mask, but nothing helped me.
I thought this article (How to make only the part covered by text/title transparent in a UIView in IOS) is helpful and coded like Dave's way, but got only white screen.
Here is what I have done:
// create UILabel from the title text
CGRect rectFrame = CGRectMake(0, 0, videoSize.width, videoSize.height);
UILabel *lbTitle = [[UILabel alloc] initWithFrame:rectFrame];
lbTitle.text = self.titleText;
lbTitle.font = [UIFont fontWithName:#"Helvetica" size:60];
lbTitle.textColor = [UIColor blackColor];
lbTitle.backgroundColor = [UIColor whiteColor];
// get title image and create mask layer
UIGraphicsBeginImageContextWithOptions(lbTitle.bounds.size, TRUE, [[UIScreen mainScreen] scale]);
[lbTitle.layer renderInContext:UIGraphicsGetCurrentContext()];
CGImageRef viewImage = [UIGraphicsGetImageFromCurrentImageContext() CGImage];
UIGraphicsEndImageContext();
CALayer *maskLayer = [CALayer layer];
maskLayer.contents = (__bridge id)viewImage;
maskLayer.frame = rectFrame;
// create title background layer and set mastLayer as mast layer of this layer
// this layer corresponds to "UIView's layer" in Dave's method
CALayer *animatedTitleLayer = [CALayer layer];
animatedTitleLayer.backgroundColor = [UIColor whiteColor].CGColor;
animatedTitleLayer.mask = maskLayer;
animatedTitleLayer.frame = rectFrame;
...
[view.layer addSubLayer:animatedTitleLayer];
Here I used animatedTitleLayer as title background(black background), but what I see is white screen.
Anyone can help me? Thanks in advance.
The mask uses the alpha channel to determine what parts to mask out and what parts to keep. However, your label that you render into an image is rendered as black text on a white background so there is no transparency in the image.
You have also specified that the graphics context you are using to render the image is opaque so even if the background color of the label as was clear you would get an opaque image.
So you need to set a clear background color on the label and pass NO as the second argument when you create the graphics context.
How to drop a shadow on UIImageView which has a masked image?
I don't mean a rectangular shadow - I'd like to apply the same mask effect to shadow too.
To give the Shadow Effect to UIImageView Try below code..
1) #import <QuartzCore/QuartzCore.h> in .h file
2) To give a shadow effect to Cell's UIImageView
mediaImage.layer.shadowColor = [UIColor blackColor].CGColor;
mediaImage.layer.shadowRadius = 10.f;
mediaImage.layer.shadowOffset = CGSizeMake(0.f, 5.f);
mediaImage.layer.shadowOpacity = 1.f;
mediaImage.clipsToBounds = NO;
Well! You can try this one.
// Use a White background to make the shadow prominent.
self.view.backgroundColor = [UIColor whiteColor];
// The image we're going to mask and shadow
UIImageView *image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"yourImage.jpeg"]];
image.center = self.view.center;
// Make new layer to contain shadow and masked image
CALayer *containerLayer = [CALayer layer];
containerLayer.shadowColor = [UIColor blackColor].CGColor;
containerLayer.shadowRadius = 10.f;
containerLayer.shadowOffset = CGSizeMake(0.f, 5.f);
containerLayer.shadowOpacity = 1.f;
// Use the image's layer to mask the image into a circle
image.layer.cornerRadius = roundf(image.frame.size.width/2.0);
image.layer.masksToBounds = YES;
// Add masked image layer into container layer so that it's shadowed
[containerLayer addSublayer:image.layer];
// Add container including masked image and shadow into view
[self.view.layer addSublayer:containerLayer];
You can custom a subclass called NEWImageVIew inherit UIImageView.In NEWImageVIew you can make a property called realImageContainer,which you can set image to this property.
#interface NEWImageView : UIImageView
#property (nonatomic,strong) UIImageView *realImageContainer;
#end
#implementation NEWImageView
- (UIImageView *)realImageContainer {
if (!_realImageContainer) {
_realImageContainer = [UIImageView new];
[self addSubview:_realImageContainer];
[_realImageContainer mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self);
}];
}
return _realImageContainer;
}
#end
When you want to make the image masked and shadowed, you can set image in realImageContainer and set mask to realImageContainer layer,so you get the masked layer.
NEWImageView *newImgView = [[NEWImageView alloc] init];
newImgView.backgroundColor = [UIColor clearColor];
newImgView.contentMode = UIViewContentModeScaleAspectFit;
newImgView.realImageContainer.image = self.image;
newImgView.realImageContainer.layer.mask = self.maskLayer;//this masklayer you can make youself
What about shadow?Because the realImageContainer is added to NEWImageView's view,the NEWImageView's layer not used yet,you can set shadow here.
newImgView.layer.shadowColor = [UIColor blackColor].CGColor;
newImgView.layer.shadowOpacity = 0.33;
newImgView.layer.shadowRadius = 8;
newImgView.layer.shadowOffset = CGSizeMake(0, 19);
so you get a masked and shadowed image.（I use a triangle image as mask,so I get this image）
you have to set an image with a transparent background and then you add the shadow like that:
imageView.layer.shadowColor = [UIColor blackColor].CGColor;
imageView.layer.shadowOpacity = 0.1;
imageView.layer.shadowRadius = 5;
imageView.layer.shadowOffset = CGSizeMake(5, 5);
[imageView setClipsToBounds:NO];
remember you have to import QuarzCore library
I'm using a CAGradientLayer to make a gradient background for a text field. It looks like this
Instead of the background I want to have the gradient on the text. How can I make gradient text in a UITextField?
The code I used to make the gradient in the image
pinkDarkOp = [UIColor colorWithRed:0.9f green:0.53f blue:0.69f alpha:1.0];
pinkLightOp = [UIColor colorWithRed:0.79f green:0.45f blue:0.57f alpha:1.0];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = [[myTextField layer] bounds];
gradient.cornerRadius = 7;
gradient.colors = [NSArray arrayWithObjects:
(id)pinkDarkOp.CGColor,
(id)pinkLightOp.CGColor,
nil];
[[myTextField layer]addSublayer:gradient];
You can solve this by creating two layers:
First you create a layer which you fill with the gradient.
Then you create another layer containing the text.
Finally you use the second layer as a mask for masking the first layer. This is achieved by assigning the second layer to the mask property of the first layer.
If I look more specifically on your code example, I think that everything before the last line should be OK. But then you should replace the last line with something like this:
gradient.mask = myTextField.layer;
Perhaps you need to do some adjustments to myTextField as well (hard to say since its definition is not part of the listed code). It's important to understand that the text in the mask must be opaque but the rest of that layer must be fully transparent. Read about the "mask" property in the CALayer class reference:
https://developer.apple.com/library/ios/DOCUMENTATION/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/occ/instp/CALayer/mask
Dislaimer: I have not had time to test the code. I leave that to you. But the general idea of masking one layer with another should be possible to use, so I am convinced that you can sort out the details by yourself.
i made somme changes in my codes
pinkDarkOp = [UIColor colorWithRed:0.9f green:0.53f blue:0.69f alpha:1.0];
pinkLightOp = [UIColor colorWithRed:0.79f green:0.45f blue:0.57f alpha:1.0];
gradient.frame = [[myTextField layer] bounds];
gradient.cornerRadius = 7;
gradient.colors = [NSArray arrayWithObjects:(id)pinkDarkOp.CGColor,
(id)[[UIColor clearColor] CGColor], nil];
gradient.mask=myTextField.layer;
the text is invisible now
I want to achieve the text appearance like in the pictures below:
Now I'm working on shadow around the letters and I can't figure out how to do that.
What I've tried so far:
- The solution with:
label.shadowColor = [UIColor blackColor];
label.shadowOffset = CGSizeMake(1, 2);
gives a nice sharp shadow, but it doesn't fit my needs by two reasons:
It gives a shadow only from one side, set up by shadowOffset, whereas I need a "wrapping" shadow;
This solution doesn't give the soft part of the shadow (gradient) as there is in the pictures;
-The solution with:
label.layer.shadowOffset = CGSizeMake(0, 0);
label.layer.shadowRadius = 5.0;
label.layer.shouldRasterize = YES;
label.layer.shadowOpacity = 1;
label.layer.shadowColor = [UIColor blackColor].CGColor;
label.layer.masksToBounds = NO;
Works great, but it gives too soft shadow even though the shadowOpacity is set to 1 and the shadowColor is set to black:
Obviously it's not enough and I already think about drawing in labels' context. But it is not clear to me how would I achieve the goal even through context drawing.
Any idea would be much appreciated.
Try this
Create a Custom UILabel SubClass and Override the following method
- (void)drawTextInRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextSetShadow(context, CGSizeMake(0.0, 0.0), 10);
CGContextSetShadowWithColor(context, CGSizeMake(0.0, 0.0), 10, [UIColor blackColor].CGColor);
[super drawTextInRect:rect];
CGContextRestoreGState(context);
}
and this bottomColorLayer to the Label
CALayer *bottomColorLayer = [CALayer layer];
bottomColorLayer.frame = CGRectMake(0, labelRect.size.height/2, labelRect.size.width, labelRect.size.height/2);
bottomColorLayer.backgroundColor = [[UIColor colorWithWhite:0 alpha:.5] CGColor];
[label.layer insertSublayer:bottomColorLayer above:(CALayer *)label.layer];
or If you want Gradient
CAGradientLayer *bottomGradient = [CAGradientLayer layer];
bottomGradient.frame = CGRectMake(0, labelRect.size.height/2, labelRect.size.width, labelRect.size.height/2);
bottomGradient.cornerRadius = 0.0f;
bottomGradient.colors = #[(id)[[UIColor colorWithWhite:1 alpha:.5] CGColor], (id)[[UIColor colorWithWhite:0 alpha:.5] CGColor]];
[label.layer insertSublayer:bottomGradient above:(CALayer *)label.layer];
Use an explicit shadow path that's the shape you want. It sounds like you want a shadow the same shape as your text, but larger, with each shadow-letter centered on its corresponding letter. Once you have that, use the shadow radius to soften the edges of the shadow to whatever degree you want.
The code you have relies on the shadow radius alone to make the shadow larger than the text, which removes your ability to control the softness.
Try with the code below :-
[_testLable setText:#"TION ERRO"];
[_testLable setTextColor:[UIColor whiteColor]];
[_testLable setFont:[UIFont boldSystemFontOfSize:22] ];
_testLable.layer.shadowOffset = CGSizeMake(0, 0);
_testLable.layer.shadowRadius = 10.0;
_testLable.layer.shouldRasterize = YES;
_testLable.layer.shadowOpacity = 1;
_testLable.layer.shadowColor = [UIColor blackColor].CGColor;
_testLable.layer.masksToBounds = NO;
CGPathRef shadowPath = CGPathCreateWithRect(_testLable.bounds, NULL);
_testLable.layer.shadowPath = shadowPath;
CGPathRelease(shadowPath);
Its output is like this:-