How can I add a text on an image in iphone? - ios

I need to put a text over an image in iPhone. It's like the Eurosport iPhone app.
(source: mzstatic.com)
In the same way I need to put a text in my app. How can I do this?
Thanks.

I found two ways
1:
UIImageView *imageView = [[UIImageView alloc] init];
imageView.frame = CGRectMake(0, 25, 200, 200);
imageView.image = [UIImage imageNamed:#"Choice set.png"];
UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 20)];
myLabel.text = #"Hello There";
myLabel.textColor = [UIColor whiteColor];
myLabel.backgroundColor = [UIColor blueColor];
[imageView addSubview:myLabel];
[self.view addSubview:imageView];
[imageView release];
[myLabel release];
2:
Add text to UIImage
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1{
int w = img.size.width;
int h = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
char* text= (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];
CGContextSelectFont(context, "Arial",20, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 0, 0, 0, 1);
CGContextShowTextAtPoint(context,10,10,text, strlen(text));
CGImageRef imgCombined = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
UIImage *retImage = [UIImage imageWithCGImage:imgCombined];
CGImageRelease(imgCombined);
return retImage;
}
then call
UIImage *image = [UIImage imageNamed:#"myimage.png"];
imageView.image = [self addText:image text:#"Hello there"];

Just simple make label with clear background.
yourLabel.backgroundColor = [UIColor clearColor];

Related

UISegmentedControl tintColor gradient

I'm trying to set the foreground/tintColor of a UISegmentedControl to a horizontal gradient. I want the gradient to extend across the control and appropriately adjust when each segment is clicked. See image below:
I've tried setting the tintColor using the stackoverflow solution found here, but using colorWithPattern doesn't seem to work when I change it to be horizontal:
Here's what I'm using now:
UIView* test2 = [[UIView alloc] initWithFrame:CGRectMake(10, 60, 200, 25)];
test2.backgroundColor = [self gradientFromColor:[UIColor redColor] toColor:[UIColor greenColor] withWidth:test2.frame.size.width];
[self.view addSubview:test2];
UISegmentedControl *test = [[UISegmentedControl alloc] initWithItems:#[#"one", #"two"]];
test.frame = CGRectMake(10, 100, 200, 25);
test.tintColor = [self gradientFromColor:[UIColor redColor] toColor:[UIColor greenColor] withWidth:test.frame.size.width];
[self.view addSubview:test];
...
- (UIColor*) gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withWidth:(int)width{
CGSize size = CGSizeMake(width, 1);
UIGraphicsBeginImageContextWithOptions(size, NO, 1);
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(width, 0), 0);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
CGGradientRelease(gradient);
CGColorSpaceRelease(colorspace);
UIGraphicsEndImageContext();
return [UIColor colorWithPatternImage:image];
}
I'm thinking I need to do some work with masking but I've been having trouble getting it to work.

iOS UISegmentedControl with image overlaps by tint color

I have some problem with UISegmentedControl with image. When I put image with text on it in segment tintcolor paints my image and the text.
Can any help with it?
setting up UIImage in Segment
UIImage *tmp = [UIImage imageNamed:#"UISegmentedControl-active"];
UIImage *imageWithText = [UIImage imageFromImage:tmp string:#"20" color:[UIColor whiteColor]];
[self.segmentedControl setImage:imageWithText forSegmentAtIndex:0];
imageFromImage code:
+ (id) imageFromImage:(UIImage*)image string:(NSString*)string color:(UIColor*)color
{
UIFont *font = [UIFont systemFontOfSize:16.0];
CGSize expectedTextSize = [string sizeWithAttributes:#{NSFontAttributeName: font}];
int width = image.size.width + 5;
int height = MAX(expectedTextSize.height, image.size.width);
CGSize size = CGSizeMake((float)width, (float)height);
UIGraphicsBeginImageContextWithOptions(size, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, color.CGColor);
int fontTopPosition = (height - expectedTextSize.height) / 2;
CGPoint textPoint = CGPointMake(width + 5, fontTopPosition);
// Images upside down so flip them
//CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, size.height);
//CGContextConcatCTM(context, flipVertical);
CGContextDrawImage(context, (CGRect){ {0, (height - image.size.height) / 2}, {image.size.width, image.size.height} }, [image CGImage]);
[string drawAtPoint:textPoint withAttributes:#{NSFontAttributeName: font}];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Image goes blue(default tintcolor).
Anyway, if anyone know how to do segmented control with circular(not rounded) segments(buttons), offer your solution.

How to write a text on image iOS?

In my app I'm trying to add a text on an image. I've done it using a post in stackoverflow. It's like the following.
+(UIImage *)addText:(UIImage *)img text:(NSString *)text1{
int w = img.size.width;
int h = img.size.height;
//lon = h - lon;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1);
char* text = (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];// "05/05/09";
CGContextSelectFont(context, "Arial", 18, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 255, 255, 255, 1);
//rotate text
CGContextSetTextMatrix(context, CGAffineTransformMakeRotation( -M_PI/4 ));
CGContextShowTextAtPoint(context, 4, 52, text, strlen(text));
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}
When I'm writing a text using this code, the original image's colour is changed like the following,
Original Image
Output with Text
Can anyone explain why is this happening. and how to fix this??
Thanks in Advance!!
We need to create a image context and apply drawing and get final image from this context. You can try this method. Hope this help you.
+ (UIImage *) addText:(UIImage *)img text:(NSString *)text
{
CGRect rect = [[UIScreen mainScreen] bounds];
// create a context according to image size
UIGraphicsBeginImageContext(rect.size);
// draw image
[img drawInRect:rect];
UIFont* font = [UIFont systemFontOfSize:14.0];
/// Make a copy of the default paragraph style
NSMutableParagraphStyle* paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
/// Set line break mode
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
/// Set text alignment
paragraphStyle.alignment = NSTextAlignmentCenter;
NSDictionary *attributes = #{ NSFontAttributeName: font,
NSParagraphStyleAttributeName: paragraphStyle };
CGRect textRect = CGRectMake(20, 160.0, 280.0, 44);
/// draw text
[text drawInRect:textRect withAttributes:attributes];
// get as image
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
EDIT: This can only be run on the main thread! So it's pretty much useless.
+(UIImage *)imageFromView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Here's a new one using Core Graphics that can be used on any thread
+ (UIImage *)imageFromView:(UIView *)view
{
size_t width = view.bounds.size.width*2;
size_t height = view.bounds.size.height*2;
unsigned char *imageBuffer = (unsigned char *)malloc(width*height*8);
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef imageContext = CGBitmapContextCreate(imageBuffer, width, height, 8, width*4, colourSpace,kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colourSpace);
CGContextTranslateCTM(imageContext, 0.0, height);
CGContextScaleCTM(imageContext, 2.0, -2.0);
[view.layer renderInContext:imageContext];
CGImageRef outputImage = CGBitmapContextCreateImage(imageContext);
UIImage *image = [[UIImage alloc] initWithCGImage:outputImage];
CGImageRelease(outputImage);
CGContextRelease(imageContext);
free(imageBuffer);
return image;
}
I am using this and it works fine for me
- (UIImage*) drawText:(NSString*) text
inImage:(UIImage*) image
atPoint:(CGPoint) point
{
UIFont *font = [UIFont fontWithName:FONT_BOLD size:20];
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];
CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);
[UIColorFromRGB(0x515151) set];
[text drawInRect:CGRectIntegral(rect) withFont:font];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}

Text Water mark in xcode

hi all i have looked at answers to similar questions and none seem to work for me. I am trying to water mark an image from the camera (image in the below) and add an image and text as a water mark. The below is working perfectly for adding the image but have no idea how to do the text.
WmarkImage = [UIImage imageNamed:#"60.png"];
UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
[WmarkImage drawInRect:CGRectMake(image.size.width - WmarkImage.size.width, image.size.height - WmarkImage.size.height, WmarkImage.size.width, WmarkImage.size.height)];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[imageView setImage:image];
You should convert your text to image then merge them here is an code for this please check this.
NSString* kevin = #"Hello";
UIFont* font = [UIFont systemFontOfSize:12.0f];
CGSize size = [kevin sizeWithFont:font];
// Create a bitmap context into which the text will be rendered.
UIGraphicsBeginImageContext(size);
// Render the text
[kevin drawAtPoint:CGPointMake(0.0, 0.0) withFont:font];
// Retrieve the image
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
UIImage *MergedImage = [UIImage imageNamed:#"mark.png"];
CGSize newSize = CGSizeMake(200, 400);
UIGraphicsBeginImageContext( newSize );
// Use existing opacity as is
[MergedImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Apply supplied opacity if applicable
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height) blendMode:kCGBlendModeNormal alpha:0.8];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(20, 20, 300, 400)];
[imageView setImage:newImage];
[self.view addSubview:imageView];
This might help..
CATextLayer *theTextLayer = [CATextLayer layer];
theTextLayer.string = #"Your Text here";
theTextLayer.font = #"Helvetica";
theTextLayer.fontSize = #"12"
theTextLayer.alignmentMode = kCAAlignmentCenter;
theTextLayer.bounds = CGRectMake(0, 0, 40, 40);//give whatever width or height you want
[imageview.layer addSubLayer:theTextLayer];

drawAtPoint not working after converting from CGContextShowTextAtPoint

as CGContextShowTextAtPoint is deprecated in iOS 7, i would like to change CGContextShowTextAtPoint to drawAtPoint but the text is outputting.
//Add text to UIImage
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1{
int w = 32;
int h = 32;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
//char* text= (char *)[text1 cStringUsingEncoding:NSASCIIStringEncoding];
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 0, 0, 0, 1);
// CGContextSelectFont(context, "Montserrat-Regular",12, kCGEncodingMacRoman);
// CGContextShowTextAtPoint(context,9,12,text, strlen(text));
//
[text1 drawAtPoint:CGPointMake(0, 0) withFont:[UIFont fontWithName:#"Montserrat-Regular" size:12]];
CGImageRef imgCombined = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
UIImage *retImage = [UIImage imageWithCGImage:imgCombined];
CGImageRelease(imgCombined);
return retImage;
}
ok got it work on
//Add text to UIImage
-(UIImage *)addText:(UIImage *)img text:(NSString *)text1
{
UIGraphicsBeginImageContext(CGSizeMake(36, 36));
CGRect aRectangle = CGRectMake(0,0, 36.0f,36.0f);
[img drawInRect:aRectangle];
[text1 drawInRect : CGRectMake(0, 10, 36, 36)
withFont : [UIFont fontWithName:#"Montserrat-Regular" size:12]
lineBreakMode : NSLineBreakByTruncatingTail
alignment : NSTextAlignmentCenter ];
UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}

Resources