I am trying to do this:
so I am using this code:
[self.lblRound setOutlineColor:[UIColor colorWithRed:(68/255.0) green:(82/255.0) blue:(120/255.0) alpha:1]];
self.lblRound.drawOutline = YES;
but this is what i get:
I also did try this code:
lblRound.shadowColor = [UIColor colorWithRed:(68/255.0) green:(82/255.0) blue:(120/255.0) alpha:1];
lblRound.shadowOffset = CGSizeMake(0, 0);
I also did try to make another label with the needed color and to draw it behind the text, but if I am playing with the size of the text, it influence on the width of the all text.
How can I make the stroke thicker?
I can't use an image because I have a number in this text that should be variable.
Thanks
This is the solution:
- (void)drawRect:(CGRect)rect
{
UIFont *font=[UIFont fontWithName:#"VAGRoundedStd-Bold" size:40];
CGContextRef context = UIGraphicsGetCurrentContext();
string = lblRoundnumber;
CGSize fontWidth = [string sizeWithFont:font];
CGRect tempRect=rect;
tempRect.origin.x +=160-(fontWidth.width/2);
tempRect.origin.y +=high+42;
CGContextSetRGBStrokeColor(context, 68/255.0f, 82/255.0f, 120/255.0f, 1/1.0f);
CGContextSetRGBFillColor(context, 68/255.0f, 82/255.0f, 120/255.0f, 1/1.0f);
CGContextSetTextDrawingMode(context, kCGTextStroke);
CGContextSetLineWidth(context, 11);
[string drawInRect:tempRect withFont:font];
CGContextSetRGBFillColor(context, 1,1,1,1);
CGContextSetTextDrawingMode(context, kCGTextFill);
[string drawInRect:tempRect withFont:font];
}
Related
So I want to set the text color for a UILabel based on a gradient made in photoshop. I have the rgb values for the gradient, {211,119,95} and {199,86,56}. Is this possible? How can I do it?
Another way if you want to target iOS 6+, with a category to UIColor
You create a UIColor from a gradient:
+ (UIColor*) gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withHeight:(int)height
{
CGSize size = CGSizeMake(1, height);
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
NSArray* colors = [NSArray arrayWithObjects:(id)c1.CGColor, (id)c2.CGColor, nil];
CGGradientRef gradient = CGGradientCreateWithColors(colorspace, (CFArrayRef)colors, NULL);
CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(0, size.height), 0);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
CGGradientRelease(gradient);
CGColorSpaceRelease(colorspace);
UIGraphicsEndImageContext();
return [UIColor colorWithPatternImage:image];
}
Then with attrString as your NSMutableAttributeString:
[attrString addAttribute:NSForegroundColorAttributeName value:[UIColor gradientFromColor:[UIColor greenColor] toColor:[UIColor redColor] withHeight:labelView.height] range:defaultRange];
labelView.attributedString = attrString;
or simply set the textColor if you don't also need strokes or other styling effect
labelView.textColor = [UIColor gradientFromColor:[UIColor greenColor] toColor:[UIColor redColor] withHeight:labelView.height];
And voila, it works better with UILabel over one line, otherwise you have to calculate your line height from your font (UIFont.leading) and pass it to the method, the background will repeat vertically.
You might want to use one of these customizable labels:
FXLabel
LEffectLabel
THLabel
I'm writing text onto an image like so:
-(UIImage *)addLabelToImage:(UIImage *)img
{
UIFont *font = [UIFont boldSystemFontOfSize:20];
UIGraphicsBeginImageContext(img.size);
[img drawInRect:CGRectMake(0, 0,img.size.width,img.size.height)];
CGRect rect = CGRectMake(60, 550, img.size.width, img.size.height);
[[UIColor whiteColor] set];
[[NSString stringWithFormat:#"%#, %#", [[NSUserDefaults standardUserDefaults] valueForKey:#"whatever"], [[NSUserDefaults standardUserDefaults] valueForKey:#"whatever2"]] drawInRect:CGRectIntegral(rect) withFont:font];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
How would I add a drop shadow to this text? I know I can just redraw the text in black shifted over a few pixels, but is there an easier way?
Cheers,
George
Before you draw your text, you can set a shadow like this:
//...
CGContextRef c = UIGraphicsGetCurrentContext();
CGSize offset = CGSizeMake(0, 1);
CGFloat blur = 2.0;
UIColor *shadowColor = [UIColor blackColor];
CGContextSetShadowWithColor(c, offset, blur, [shadowColor CGColor]);
//draw your text ...
Adjust the offset, blur and shadowColor parameters as needed to achieve the effect you want. For a sharp shadow (like on a UILabel), set blur to 0.
I got a requirements to display a UILabel with background split between two colors, like in this image:
(colors here are black at the bottom and 50% gray at the top - but this is not important). I tried setting the label's background colour to 50% grey in the interface builder and then do this in the code:
CALayer *sl1 = [[[CALayer alloc] init] autorelease];
sl1.frame = CGRectMake(0, lbl.frame.size.height / 2, lbl.frame.size.width, score1.frame.size.height/2);
sl1.backgroundColor = [[UIColor blackColor] CGColor];
[lbl.layer insertSublayer:sl1 atIndex:0];
Unfortunately, this resulted in the black part being drawn over the text, so the label looks like this:
which is, needless to say, is not something I need. So how can I get this background without turning to custom images? The issue is I need to have UILabel's like this in several places, different sizes - so I would need to create multiple versions of the background image.
Any ideas? Thanks.
this works:
UILabel* myLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 50)];
myLabel.text = #"Ciao";
myLabel.textColor = [UIColor greenColor];
UIGraphicsBeginImageContext(CGSizeMake(100, 50));
CGContextRef context = UIGraphicsGetCurrentContext();
// drawing with a gray fill color
CGContextSetRGBFillColor(context, 0.4, 0.4, 0.4, 1.0);
// Add Filled Rectangle,
CGContextFillRect(context, CGRectMake(0.0, 0.0, 100, 50));
// drawing with a black fill color
CGContextSetRGBFillColor(context, 0., 0., 0., .9);
// Add Filled Rectangle,
CGContextFillRect(context, CGRectMake(0.0, 25, 100, 25));
UIImage* resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
myLabel.backgroundColor = [UIColor colorWithPatternImage:resultingImage];
[self.view addSubview:myLabel];
Use UIColor's +colorWithPatternImage:. Pass in a 1px by the UILabel's height image and it will be "tiled" across the the width of the view.
myLabel.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"label-background.png"]];
first you have to subclass the UILabel and override it's drawRect: method like this for gradient background
- (void)drawRect:(CGRect)rect
{
//////////////GET REFERENCE TO CURRENT GRAPHICS CONTEXT
CGContextRef context = UIGraphicsGetCurrentContext();
//////////////CREATE BASE SHAPE WITH ROUNDED CORNERS FROM BOUNDS
CGRect activeBounds = self.bounds;
CGFloat cornerRadius = 10.0f;
CGFloat inset = 6.5f;
CGFloat originX = activeBounds.origin.x + inset;
CGFloat originY = activeBounds.origin.y + inset;
CGFloat width = activeBounds.size.width - (inset*2.0f);
CGFloat height = activeBounds.size.height - (inset*2.0f);
CGRect bPathFrame = CGRectMake(originX, originY, width, height);
CGPathRef path = [UIBezierPath bezierPathWithRoundedRect:bPathFrame cornerRadius:cornerRadius].CGPath;
//////////////CREATE BASE SHAPE WITH FILL AND SHADOW
CGContextAddPath(context, path);
CGContextSetFillColorWithColor(context, [UIColor colorWithRed:210.0f/255.0f green:210.0f/255.0f blue:210.0f/255.0f alpha:1.0f].CGColor);
CGContextSetShadowWithColor(context, CGSizeMake(0.0f, 1.0f), 6.0f, [UIColor colorWithRed:0.0f/255.0f green:0.0f/255.0f blue:0.0f/255.0f alpha:1.0f].CGColor);
CGContextDrawPath(context, kCGPathFill);
//////////////CLIP STATE
CGContextSaveGState(context); //Save Context State Before Clipping To "path"
CGContextAddPath(context, path);
CGContextClip(context);
//////////////DRAW GRADIENT
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
size_t count = 3;
CGFloat locations[3] = {0.0f, 0.57f, 1.0f};
CGFloat components[12] =
{ 0.0f/255.0f, 0.0f/255.0f, 0.0f/255.0f, 1.0f, //1
5.0f/255.0f, 5.0f/255.0f, 5.0f/255.0f, 1.0f, //2
10.0f/255.0f, 10.0f/255.0f, 10.0f/255.0f, 1.0f}; //3
CGGradientRef gradient = CGGradientCreateWithColorComponents(colorSpace, components, locations, count);
CGPoint startPoint = CGPointMake(activeBounds.size.width * 0.5f, 0.0f);
CGPoint endPoint = CGPointMake(activeBounds.size.width * 0.5f, activeBounds.size.height);
CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
CGColorSpaceRelease(colorSpace);
CGGradientRelease(gradient);
}
This will draw black to white gradient background
May this will help you
Happy Codding :)
the above code is from this site http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-uialertview-custom-graphics/
I am wanting to draw an NSString and a border onto a UIImage that I already have. I found a method that will draw an NSString as a UIImage, but I need it to draw on an image that I provide.
-(UIImage *)imageFromText:(NSString *)text
{
// set the font type and size
UIFont *font = [UIFont systemFontOfSize:20.0];
CGSize size = [text sizeWithFont:font];
// check if UIGraphicsBeginImageContextWithOptions is available (iOS is 4.0+)
if (UIGraphicsBeginImageContextWithOptions != NULL)
UIGraphicsBeginImageContextWithOptions(size,NO,0.0);
else
// iOS is < 4.0
UIGraphicsBeginImageContext(size);
// optional: add a shadow, to avoid clipping the shadow you should make the context size bigger
//
// CGContextRef ctx = UIGraphicsGetCurrentContext();
// CGContextSetShadowWithColor(ctx, CGSizeMake(1.0, 1.0), 5.0, [[UIColor grayColor] CGColor]);
// draw in context, you can use also drawInRect:withFont:
[text drawAtPoint:CGPointMake(0.0, 0.0) withFont:font];
// transfer image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
How would I modify this method to provide my own background image, as well as adding a border?
If you are displaying the UIImage in a UIImageView you can set the UIImageView.layer.delegate and use something like:
- (void) drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {
CGContextSetFillColorWithColor(ctx, [[UIColor darkTextColor] CGColor]);
UIGraphicsPushContext(ctx);
[word drawAtPoint:CGPointMake(30.0f, 30.0f)
forWidth:200.0f
withFont:[UIFont boldSystemFontOfSize:32]
lineBreakMode:UILineBreakModeClip];
UIGraphicsPopContext();
}
Code from Add text to CALayer
The border is easy, just use the CALayer properties:
imageview.layer.borderColor = [UIColor blackColor].CGColor;
imageview.sublayer.borderWidth = 2.0;
You are looking for CALayers.
Here is very good tutorial how to create and use them.
So basically you will add new CALayer with image as a background and then draw on it text.
http://www.raywenderlich.com/2502/introduction-to-calayers-tutorial
Use this function to Draw NSString and border on UIImage
For border check CGContextSetRGBStrokeColor
-(UIImage *)imageFromText:(NSString *)text
{
// set the font type and size
UIFont *font = [UIFont systemFontOfSize:20.0];
CGSize size = [text sizeWithFont:font];
// check if UIGraphicsBeginImageContextWithOptions is available (iOS is 4.0+)
if (UIGraphicsBeginImageContextWithOptions != NULL)
UIGraphicsBeginImageContextWithOptions(size,NO,0.0);
else
// iOS is < 4.0
UIGraphicsBeginImageContext(size);
// optional: add a shadow, to avoid clipping the shadow you should make the context size bigger
//
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetShadowWithColor(ctx, CGSizeMake(1.0, 1.0), 5.0, [[UIColor brownColor] CGColor]);
// draw in context, you can use also drawInRect:withFont:
[text drawAtPoint:CGPointMake(0.0, 0.0) withFont:font];
//CGImageRef cimg = UIGraphicsGetCurrentContext();
// transfer image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
[image drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];
//CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(ctx, 2.0, 3.5, 5.0, 1.0);
CGContextStrokeRect(ctx, rect);
UIImage *testImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return testImg;
}
I can't achieve drawing some white text on a black view using CGContext in a drawRect method.
I do :
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextSetLineWidth(context, 1.0);
CGContextSelectFont(context, "Helvetica", 20, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGPoint center = self.center;
And then...
Impossible to find the correct method.
I've tried this :
UIFont* font = [UIFont fontWithName:#"Geneva" size:12.0];
[#"Some text" drawAtPoint:center withFont:font];
But it does not work.
I don't find any CGContext method for that. Where is it hidden ?
How may I draw that text in white ?
Ok after a couple of hours and reading the Quartz 2D programming guide I discovered that you also have to set the FILL color, not just the STROKE color. So the follow code works.
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
I needed to show chart labels on a darkGray border. Now the labels appear in white.
This will draw a string in white in a black rectangle
NSString *text = #"Some text";
CGPoint center = CGPointMake(100, 200);
UIFont *font = [UIFont systemFontOfSize:14];
CGSize stringSize = [text sizeWithFont:font];
CGRect stringRect = CGRectMake(center.x-stringSize.width/2, center.y-stringSize.height/2, stringSize.width, stringSize.height);
[[UIColor blackColor] set];
CGContextFillRect(context, stringRect);
[[UIColor whiteColor] set];
[text drawInRect:stringRect withFont:font];
On shorter example try using [[UIColor whiteColor] set] before the drawAtPoint: call.
Works with :
CGContextShowTextAtPoint (context, center.x, center.y, "Some text", strlen("Some text"));
But still need some transformations to be displayed not mirrored :-)
This will work with this code :
NSString *text = #"Some text";
UIFont *font = [UIFont systemFontOfSize:14];
[ text drawAtPoint:CGPointMake( 0, 0 ) withAttributes:#{ NSFontAttributeName:font, NSForegroundColorAttributeName : UIColor.redColor } ];