Я написав цю категорію. Якщо isEqual:
повернеться "НІ", він перевірить, чи може подальше порівняння різних компонентів ще збігатися. Якщо можливо, все-таки порівнюються різні моделі.
@implementation UIColor (Matching)
-(BOOL)matchesColor:(UIColor *)color error:(NSError *__autoreleasing *)error
{
UIColor *lhs = self;
UIColor *rhs = color;
if([lhs isEqual:rhs]){ // color model and values are the same
return YES;
}
CGFloat red1, red2, green1, alpha1, green2, blue1, blue2, alpha2;
BOOL lhsSuccess = [lhs getRed:&red1 green:&green1 blue:&blue1 alpha:&alpha1];
BOOL rhsSuccess = [rhs getRed:&red2 green:&green2 blue:&blue2 alpha:&alpha2];
if((!lhsSuccess && rhsSuccess) || (lhsSuccess && !rhsSuccess)){ // one is RGBA, one color not.
CGFloat r,g,b,a;
if(!lhsSuccess){ // lhs color could be a monochrome
const CGFloat *components = CGColorGetComponents(lhs.CGColor);
if([lhs _colorSpaceModel] == kCGColorSpaceModelMonochrome){
r = g = b = components[0];
a = components[1];
return r == red2 && g == green2 && b == blue2 && a == alpha2;
}
} else { // rhs color could be a monochrome
const CGFloat *components = CGColorGetComponents(rhs.CGColor);
if([rhs _colorSpaceModel] == kCGColorSpaceModelMonochrome){
r = g = b = components[0];
a = components[1];
return r == red1 && g == green1 && b == blue1 && a == alpha1;
}
}
NSError *aError = [[NSError alloc] initWithDomain:@"UIColorComparision" code:-11111 userInfo:[self _colorComparisionErrorUserInfo]];
*error = aError;
return NO;
} else if (!lhsSuccess && !rhsSuccess){ // both not RGBA, lets try HSBA
CGFloat hue1,saturation1,brightness1;
CGFloat hue2,saturation2,brightness2;
lhsSuccess = [lhs getHue:&hue1 saturation:&saturation1 brightness:&brightness1 alpha:&alpha1];
rhsSuccess = [lhs getHue:&hue2 saturation:&saturation2 brightness:&brightness2 alpha:&alpha2];
if((!lhsSuccess && rhsSuccess) || (lhsSuccess && !rhsSuccess)){
NSError *aError = [[NSError alloc] initWithDomain:@"UIColorComparision" code:-11111 userInfo:[self _colorComparisionErrorUserInfo]];
*error = aError;
return NO;
} else if(!lhsSuccess && !rhsSuccess){ // both not HSBA, lets try monochrome
CGFloat white1, white2;
lhsSuccess = [lhs getWhite:&white1 alpha:&alpha1];
rhsSuccess = [rhs getWhite:&white2 alpha:&alpha2];
if((!lhsSuccess && rhsSuccess) || (lhsSuccess && !rhsSuccess)){
NSError *aError = [[NSError alloc] initWithDomain:@"UIColorComparision" code:-11111 userInfo:[self _colorComparisionErrorUserInfo]];
*error = aError;
return NO;
} else {
return white1 == white2 && alpha1 == alpha2;
}
} else {
return hue1 == hue2 && saturation1 == saturation2 && brightness1 == brightness2 && alpha1 == alpha2;
}
} else {
return (red1 == red2 && green1 == green2 && blue1 == blue2 && alpha1 == alpha2);
}
}
-(NSDictionary *)_colorComparisionErrorUserInfo{
NSDictionary *userInfo = @{
NSLocalizedDescriptionKey: NSLocalizedString(@"Comparision failed.", nil),
NSLocalizedFailureReasonErrorKey: NSLocalizedString(@"The colors models are incompatible. Or the color is a pattern.", nil),
};
return userInfo;
}
- (CGColorSpaceModel)_colorSpaceModel {
return CGColorSpaceGetModel(CGColorGetColorSpace(self.CGColor));
}
@end
UIColor *green1 = [UIColor greenColor];
UIColor *green2 = [UIColor colorWithRed:0 green:1 blue:0 alpha:1];
UIColor *yellow = [UIColor yellowColor];
UIColor *grey1 = [UIColor colorWithWhite:2.0/3.0 alpha:1];
UIColor *grey2 = [UIColor lightGrayColor];
NSError *error1, *error2, *error3, *error4, *error5;
BOOL match1 = [green1 matchesColor:green2 error:&error1]; // YES
BOOL match2 = [green1 matchesColor:yellow error:&error2]; // NO
BOOL match3 = [green1 matchesColor:grey1 error:&error3]; // NO
BOOL match4 = [grey1 matchesColor:grey2 error:&error4]; // YES
BOOL match5 = [grey1 matchesColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"bg.png"]]
error:&error5]; // NO, Error