CODEWITHSUNDEEP
iphoneuiimageviewuiimageios6
Vishal
Vishal

Reputation: 8256

write text on image view image

Currently, I am developing an App in which I have a Image view on which image are constantly

changes after some time. Now I want that I am able to write some text or draw any symbol

,simple line,cross line means to say drawing on image appears in image view. Means I want to

add text or drawing some symbols or lines e.t.c on image. I am searching everywhere but can't

find any solution. How can I solve this? Thanks in advance.

Upvotes: 3

Views: 1111

Answers (2)

Midhun MP
Midhun MP

Reputation: 107121

You have two options.

  1. Add a UILabel as the subview of imageView and set the backgroundcolor of UILabel to clear color.

  2. Implement the following method, which takes image and text as argument and returns the text added image.

    //Add text to UIImage

    -(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];

}

Reference : http://iphonesdksnippets.com/post/2009/05/05/Add-text-to-image-%28UIImage%29.aspx

Upvotes: 2

Nitish
Nitish

Reputation: 14113

See if this works : 

//Add text to UIImage

-(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];

}

Upvotes: 1

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