IPhone développement: composants UIColor / CGColor comparaison

Question

J'ai des codes internes pour les couleurs dans mon application, je créé une fonction qui, étant donné une couleur, renvoie le code. Je vais avoir des problèmes car il ne fonctionne tout simplement pas de travail et retourne toujours « 01 » pour chaque couleur autre que le rouge, qui renvoie le code approprié. Quelqu'un at-il un indice à ce sujet?

(NSString *) internalColorCode: (UIColor *) couleur {

const CGFloat *components = CGColorGetComponents(color.CGColor);
CGFloat red = components[0];
CGFloat green = components[1];
CGFloat blue = components[2];

NSString *s = [NSString stringWithFormat:@"-- Red: %f - Green: %f - Blue: %f", red, green, blue];
NSLog(s);

if ((0.949019 <= red <= 0.949021) && (0.949019 <= green <= 0.949021) && (0.952940 <= blue <= 0.952942)) {
    return [NSString stringWithFormat:@"01"];
} else if ((0.760783 <= red <= 0.760785) && (0.768626 <= green <= 0.768628) && (0.776470 <= blue <= 0.776472)) {
    return [NSString stringWithFormat:@"02"];
} else if ((0.427450 <= red <= 0.427452) && (0.431372 <= green <= 0.431374) && (0.443136 <= blue <= 0.443138)) {
    return [NSString stringWithFormat:@"03"];
} else if ((0.254901 <= red <= 0.254903) && (0.250979 <= green <= 0.250981) && (0.258823 <= blue <= 0.258825)) {
    return [NSString stringWithFormat:@"04"];
} else if ((0.156862 <= red <= 0.156864) && (0.156862 <= green <= 0.156864) && (0.152940 <= blue <= 0.152942)) {
    return [NSString stringWithFormat:@"05"];
} else if ((0.784313 <= red <= 0.784315) && (0.568626 <= green <= 0.568628) && (0.388234 <= blue <= 0.388236)) {
    return [NSString stringWithFormat:@"06"];
} else if ((0.576470 <= red <= 0.576472) && (0.415685 <= green <= 0.415687) && (0.278430 <= blue <= 0.278432)) {
    return [NSString stringWithFormat:@"07"];
} else if ((0.431372 <= red <= 0.431374) && (0.301960 <= green <= 0.301962) && (0.192156 <= blue <= 0.192158)) {
    return [NSString stringWithFormat:@"08"];
} else if ((0.356862 <= red <= 0.356864) && (0.243136 <= green <= 0.243138) && (0.145097 <= blue <= 0.145099)) {
    return [NSString stringWithFormat:@"09"];
} else if ((0.274509 <= red <= 0.274511) && (0.180391 <= green <= 0.180393) && (0.090195 <= blue <= 0.090197)) {
    return [NSString stringWithFormat:@"10"];
} else if ((0.627450 <= red <= 0.627452) && (0.000000 <= green <= 0.000001) && (0.090195 <= blue <= 0.090197)) {
    return [NSString stringWithFormat:@"11"];
} else if ((0.968626 <= red <= 0.968628) && (0.121568 <= green <= 0.121570) && (0.105881 <= blue <= 0.105883)) {
    return [NSString stringWithFormat:@"12"];
} else if ((0.999999 <= red <= 1.000000) && (0.466666 <= green <= 0.466668) && (0.000000 <= blue <= 0.000001)) {
    return [NSString stringWithFormat:@"13"];
} else if ((0.964705 <= red <= 0.964707) && (0.560783 <= green <= 0.560785) && (0.450979 <= blue <= 0.450981)) {
    return [NSString stringWithFormat:@"14"];
} else if ((0.999999 <= red <= 1.000000) && (0.709803 <= green <= 0.709805) && (0.498038 <= blue <= 0.498040)) {
    return [NSString stringWithFormat:@"15"];
} else if ((0.980391 <= red <= 0.980393) && (0.811764 <= green <= 0.811766) && (0.584313 <= blue <= 0.584315)) {
    return [NSString stringWithFormat:@"16"];
} else if ((0.999999 <= red <= 1.000000) && (0.870587 <= green <= 0.870589) && (0.525489 <= blue <= 0.525491)) {
    return [NSString stringWithFormat:@"17"];
} else if ((0.988234 <= red <= 0.988236) && (0.886274 <= green <= 0.886276) && (0.662744 <= blue <= 0.662746)) {
    return [NSString stringWithFormat:@"18"];
} else if ((0.968626 <= red <= 0.968628) && (0.894117 <= green <= 0.894119) && (0.352940 <= blue <= 0.352942)) {
    return [NSString stringWithFormat:@"19"];
} else if ((0.815685 <= red <= 0.815687) && (0.752940 <= green <= 0.752942) && (0.239215 <= blue <= 0.239217)) {
    return [NSString stringWithFormat:@"20"];
} else if ((0.862744 <= red <= 0.862746) && (0.870587 <= green <= 0.870589) && (0.152940 <= blue <= 0.152942)) {
    return [NSString stringWithFormat:@"21"];
} else if ((0.576470 <= red <= 0.576472) && (0.772548 <= green <= 0.772550) && (0.254901 <= blue <= 0.254903)) {
    return [NSString stringWithFormat:@"22"];
} else if ((0.133332 <= red <= 0.133334) && (0.682352 <= green <= 0.682354) && (0.305881 <= blue <= 0.305883)) {
    return [NSString stringWithFormat:@"23"];
} else if ((0.000000 <= red <= 0.000001) && (0.482352 <= green <= 0.482354) && (0.231372 <= blue <= 0.231374)) {
    return [NSString stringWithFormat:@"24"];
} else if ((0.137254 <= red <= 0.137256) && (0.247058 <= green <= 0.247060) && (0.000000 <= blue <= 0.000001)) {
    return [NSString stringWithFormat:@"25"];
} else if ((0.470587 <= red <= 0.470589) && (0.823528 <= green <= 0.823530) && (0.968626 <= blue <= 0.968628)) {
    return [NSString stringWithFormat:@"26"];
} else if ((0.000000 <= red <= 0.000001) && (0.658823 <= green <= 0.658825) && (0.847058 <= blue <= 0.847060)) {
    return [NSString stringWithFormat:@"27"];
} else if ((0.000000 <= red <= 0.000001) && (0.435293 <= green <= 0.435295) && (0.690195 <= blue <= 0.690197)) {
    return [NSString stringWithFormat:@"28"];
} else if ((0.000000 <= red <= 0.000001) && (0.294117 <= green <= 0.294119) && (0.478430 <= blue <= 0.478432)) {
    return [NSString stringWithFormat:@"29"];
} else if ((0.000000 <= red <= 0.000001) && (0.129411 <= green <= 0.129413) && (0.490195 <= blue <= 0.490197)) {
    return [NSString stringWithFormat:@"30"];
} else if ((0.384313 <= red <= 0.384315) && (0.109803 <= green <= 0.109805) && (0.360783 <= blue <= 0.360785)) {
    return [NSString stringWithFormat:@"31"];
} else if ((0.725489 <= red <= 0.725491) && (0.109803 <= green <= 0.109805) && (0.552940 <= blue <= 0.552942)) {
    return [NSString stringWithFormat:@"32"];
} else if ((0.658823 <= red <= 0.658825) && (0.352940 <= green <= 0.352942) && (0.639215 <= blue <= 0.639217)) {
    return [NSString stringWithFormat:@"33"];
} else if ((0.937254 <= red <= 0.937256) && (0.384313 <= green <= 0.384315) && (0.643136 <= blue <= 0.643138)) {
    return [NSString stringWithFormat:@"34"];
} else if ((0.999999 <= red <= 1.000000) && (0.623528 <= green <= 0.623530) && (0.776470 <= blue <= 0.776472)) {
    return [NSString stringWithFormat:@"35"];
}else {
    return [NSString stringWithFormat:@"01"];
}

}

Answer 1

Le problème est avec le type de logique utilisée dans le code comme (0,949019 <= rouge <= 0,949021).

Vous devez remplacer par ((0,949019 <= rouge) && (rouge <= 0,949021)) pour l'expression à évaluer de la manière attendue.

Alors, toutes les vérifications de l'état du type (a <= variable <= b) doivent être changé ((a <= variable) && (variable <= b)).

Ce qui suit est l'explication détaillée de la raison pour laquelle il ne fonctionne pas.

Opérateur de priorité <= est de gauche à droite. Par conséquent, l'expression est évaluée comme suit:

1. Tout d'abord 'un' par rapport à 'variable' et le résultat est évalué.

2. Le résultat (et non la 'variable') est ensuite comparé avec le résultat 'b' et finale soit trouvée.

Ce n'est pas que vous le souhaitez pour évaluer l'expression.