iOS random colors

#import <UIKit/UIKit.h> @interface Uicolor (randomcolor) + (Uicolor *) Randomcolor; @end #import "uicolor+  RandomColor.h "@implementation Uicolor (Randomcolor) + (Uicolor *) randomcolor{cgfloat hue = (arc4random ()% 256/256.0  );  0.0 to 1.0 cgfloat saturation = (arc4random ()% 128/256.0) + 0.5;  0.5 to 1.0,away from white cgfloat brightness = (arc4random ()% 128/256.0) + 0.5; 0.5 to 1.0,away from black return [Uicolor Colorwithhue:hue saturation:saturation brightness:brightness alpha:1]; @end draw randomly generated colors into a picture. -(void) createimage{nsstring* path = [Nssearchpathfordirectoriesindomains (nsdocumentdirectory,nsuserdomainmask,yes    ) objectatindex:0];    Path = @ "/users/shouqiangwei/desktop/unnamed folder 2";    NSLog (@ "path =%@", path);    NSString *imgname;    NSString *imgurl;    NSString *marknum;    UIImage *img;    NSData *imgdata;    Nserror *err;    int width=, height=1000, fontSize;    Cgpoint Markpoint;    int baselength = 320; Nsfilemanager *FM = [NsfilemAnagerdefaultmanager];        for (int i=0; i<1000; i++) {Uicolor *color = [Uicolorrandomcolor];        [_currentcolorimageviewsetbackgroundcolor:color];        Imgname = [NSString stringwithformat:@ "%i.jpg", i+1];        _lblcount.text = imgname;        Imgurl = [path stringbyappendingpathcomponent:imgname]; if (![ FM Fileexistsatpath:imgurl]) {Const CGFloat *colorcomps = cgcolorgetcomponents (color.            Cgcolor);            Marknum = [NSString stringwithformat:@ "%i", i+1];            FontSize = WIDTH/5;            Markpoint = Cgpointmake (FONTSIZE/2, FONTSIZE/2);            Uigraphicsbeginimagecontext (Cgsizemake (width, height));            Cgcontextref CTX =uigraphicsgetcurrentcontext ();            Cgcontextsetrgbfillcolor (CTX, colorcomps[0], colorcomps[1], colorcomps[2], colorcomps[3]);            Cgcontextfillrect (CTX, cgrectmake (0, 0, width, height));            Cgcontextsetrgbfillcolor (CTX, 1.0, 1.0, 1.0,1.0);            Create a number on the picture. [Marknum DRAWATPOint:markpoint Withfont:[uifont Systemfontofsize:fontsize]];            img = Uigraphicsgetimagefromcurrentimagecontext ();            self.imageview.image= img;            Uigraphicsendimagecontext ();            Create to Local.            Imgdata = [Nsdatadatawithdata:uiimagejpegrepresentation (img,1.0f)];            [Imgdata writetofile:imgurloptions:nsdatawritingatomicerror:&err];            if (err) {NSLog (@ "error:%@\nimage:%@", Err.localizeddescription, imgname);            } else {NSLog (@ "Done:%@", imgname); }        }    }}