ios - Comparing equality of [UIColor colorWithPatternImage:] -

i want compare 2 uicolors generated using [uicolor colorwithpatternimage:] equality. can't seem figure out how this.

[[uicolor colorwithpatternimage:[uiimage imagenamed:@"camo2"]] isequal: [uicolor colorwithpatternimage:[uiimage imagenamed:@"camo2"]]] 

always returns false, whether use == or isequal. know if it's possible compare colorwithpatternimages, or cgpatterns suppose? i've tried comparing cgcolorgetpattern(color.cgcolor) doesn't work either.

edit: reason have function accepts uicolor , gives me nsstring displaying user.

+(nsstring *)colornameforcolor:(uicolor *)color {      if ([color isequal:[uicolor whitecolor]]) {         return @"white";     }      if ([color isequal:[uicolor colorwithpatternimage:[uiimage imagenamed:@"camo"]]]) {         return @"camo";     }     ... } 

is insane thing do? suppose make own object has color property , colorname property...

using private apis

this took reverse engineering of coregraphics able find 1 private method _cgpatterngetimage appears return image.

you'll need include following headers:

#include <dlfcn.h> @import coregraphics; 

create function pointer:

typedef cgimageref (*cgpatterngetimage)(cgpatternref pattern); 

and access function:

-(void)comparepatterns {     void *handle = dlopen("/system/library/frameworks/coregraphics.framework/coregraphics", rtld_now);     cgpatterngetimage getimage = (cgpatterngetimage) dlsym(handle, "cgpatterngetimage");      uicolor *acolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"pattern1"]];     uicolor *bcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"pattern1"]];     uicolor *ccolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"pattern2"]];      nsdata *aimagedata = uiimagepngrepresentation([uiimage imagewithcgimage:getimage(cgcolorgetpattern(acolor.cgcolor))]);     nsdata *bimagedata = uiimagepngrepresentation([uiimage imagewithcgimage:getimage(cgcolorgetpattern(bcolor.cgcolor))]);     nsdata *cimagedata = uiimagepngrepresentation([uiimage imagewithcgimage:getimage(cgcolorgetpattern(ccolor.cgcolor))]);      nslog(@"should true: %d",[aimagedata isequal:bimagedata]);     nslog(@"should false: %d",[aimagedata isequal:cimagedata]); } 

you don't want access private apis in production app might useful testing.

using associative references

if going on app store better solution creating category uicolor , give associative reference store pattern name or whatever easiest compare. won't compare actual images @ it's possible if don't set correct data identify pattern comparison won't accurate.

include header:

#import <objc/runtime.h> 

create category:

@interface uicolor(custompatterns) @property (strong, nonatomic) nsstring* patternname; @end  @implementation uicolor(custompatterns)  static char custom_patterns_pattern_name_key;  @dynamic patternname;  -(void)setpatternname:(nsstring *)patternname {    objc_setassociatedobject(self, &custom_patterns_pattern_name_key, patternname, objc_association_retain_nonatomic); }  -(nsstring *)patternname {     return  (nsstring*)objc_getassociatedobject(self, &custom_patterns_pattern_name_key); }  @end 

and can set custom data , compare:

-(void)comparepatterns {         uicolor *acolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"1"]];         acolor.patternname = @"1";          uicolor *bcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"1"]];         bcolor.patternname = @"1";          uicolor *ccolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"2"]];         ccolor.patternname = @"2";          nslog(@"should true: %d",[acolor.patternname isequaltostring:bcolor.patternname]);         nslog(@"should false: %d",[acolor.patternname isequaltostring:ccolor.patternname]); }