iphone - Crop letter from image using Masking -


what need:

1) choose image library or camera

2) write , text

3) text cropped image!

below image can clarify more on need.

enter image description here

i know masking , cropping of image did masking frame in emoji me app . need know how image should cropped according dynamic text.

please give suggestions.

... uiimage *image = [uiimage imagenamed:@"dogs.png"]; uiimage *mask = [uiimage imagenamed:@"mask.png"];  // result of masking method uiimage *maskedimage = [self maskimage:image withmask:mask];  ...  - (uiimage*) maskimage:(uiimage *)image withmask:(uiimage *)maskimage {      cgimageref maskref = maskimage.cgimage;       cgimageref mask = cgimagemaskcreate(cgimagegetwidth(maskref),         cgimagegetheight(maskref),         cgimagegetbitspercomponent(maskref),         cgimagegetbitsperpixel(maskref),         cgimagegetbytesperrow(maskref),         cgimagegetdataprovider(maskref), null, false);      cgimageref maskedimageref = cgimagecreatewithmask([image cgimage], mask);     uiimage *maskedimage = [uiimage imagewithcgimage:maskedimageref];      cgimagerelease(mask);     cgimagerelease(maskedimageref);      // returns new image mask applied     return maskedimage; } 

1) write image text below code

uiimage *textedimage = [self imagefromtext:@"text show"];    -(uiimage *)imagefromtext:(nsstring *)text {    //set width string wrap.      cgsize maximumsize;     maximumsize = cgsizemake(320, 300);       //set text image font here     uifont *font = [uifont boldsystemfontofsize:50];      cgsize strsize1 = [text sizewithfont:font constrainedtosize:maximumsize linebreakmode:uilinebreakmodewordwrap];     cgsize strsize =cgsizemake(320, strsize1.height);      if (uigraphicsbeginimagecontextwithoptions != null)         uigraphicsbeginimagecontextwithoptions(strsize,no,0.0);     else         uigraphicsbeginimagecontext(strsize);      //set new text iamge frame here     cgrect newframe = cgrectmake(0, 0, 320, 400);      uicolor *color = [uicolor redcolor];      [color set];      [text  drawinrect:newframe                  withfont:font             linebreakmode:uilinebreakmodecharacterwrap                 alignment:uitextalignmentcenter];      uiimage *textimg = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();       return textimg; } 

2) after getting texture image apply image making required image

uiimage *maskedimage = [self maskimage:finalimage withmask: textedimage];   - (uiimage*) maskimage:(uiimage *)image withmask:(uiimage *)maskimage {      cgcolorspaceref colorspace = cgcolorspacecreatedevicergb();      //uiimage *maskimage = [uiimage imagenamed:@"mask.png"];     cgimageref maskimageref = [maskimage cgimage];      // create bitmap graphics context size of image     cgcontextref mainviewcontentcontext = cgbitmapcontextcreate (null, maskimage.size.width, maskimage.size.height, 8, 0, colorspace, kcgimagealphapremultipliedlast);       if (mainviewcontentcontext==null)         return null;      cgfloat ratio = 0;      ratio = maskimage.size.width/ image.size.width;      if(ratio * image.size.height < maskimage.size.height) {         ratio = maskimage.size.height/ image.size.height;     }      cgrect rect1  = {{0, 0}, {maskimage.size.width, maskimage.size.height}};     cgrect rect2  = {{-((image.size.width*ratio)-maskimage.size.width)/2 , -((image.size.height*ratio)-maskimage.size.height)/2}, {image.size.width*ratio, image.size.height*ratio}};       cgcontextcliptomask(mainviewcontentcontext, rect1, maskimageref);     cgcontextdrawimage(mainviewcontentcontext, rect2, image.cgimage);       // create cgimageref of main view bitmap content, ,     // release bitmap context     cgimageref newimage = cgbitmapcontextcreateimage(mainviewcontentcontext);     cgcontextrelease(mainviewcontentcontext);      uiimage *theimage = [uiimage imagewithcgimage:newimage];      cgimagerelease(newimage);      // return image     return theimage; } 

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