objective c - from - cómo convertir hexadecimal a RGB

uicolor to hex

Question

Quiero hacer una conversión de hexadecimal a RGB, pero el hexadecimal trata con una cadena como #FFFFFF. ¿Cómo puedo hacer eso?

Answer 1

Esto puede ayudarte

UIColor *organizationColor = [self colorWithHexString:@"#ababab" alpha:1];


- (UIColor *)colorWithHexString:(NSString *)str_HEX  alpha:(CGFloat)alpha_range{
    int red = 0;
    int green = 0;
    int blue = 0;
    sscanf([str_HEX UTF8String], "#%02X%02X%02X", &red, &green, &blue);
    return  [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha_range];
}

Answer 2

Acabo de expandir mi categoría UIColor para ti.
UIColor *green = [UIColor colorWithHexString:@"#00FF00"]; como UIColor *green = [UIColor colorWithHexString:@"#00FF00"];

//
//  UIColor_Categories.h
//
//  Created by Matthias Bauch on 24.11.10.
//  Copyright 2010 Matthias Bauch. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface UIColor(MBCategory) 

+ (UIColor *)colorWithHex:(UInt32)col;
+ (UIColor *)colorWithHexString:(NSString *)str;

@end

//
//  UIColor_Categories.m
//
//  Created by Matthias Bauch on 24.11.10.
//  Copyright 2010 Matthias Bauch. All rights reserved.
//

#import "UIColor_Categories.h"

@implementation UIColor(MBCategory)

// takes @"#123456"
+ (UIColor *)colorWithHexString:(NSString *)str {
    const char *cStr = [str cStringUsingEncoding:NSASCIIStringEncoding];
    long x = strtol(cStr+1, NULL, 16);
    return [UIColor colorWithHex:x];
}

// takes 0x123456
+ (UIColor *)colorWithHex:(UInt32)col {
    unsigned char r, g, b;
    b = col & 0xFF;
    g = (col >> 8) & 0xFF;
    r = (col >> 16) & 0xFF;
    return [UIColor colorWithRed:(float)r/255.0f green:(float)g/255.0f blue:(float)b/255.0f alpha:1];
}

@end

Answer 3

//In your header file  

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]  

//usage  
UIColor *color = UIColorFromRGB(0x000000)  
//you can also use it inline  
[text.textField setTextColor:UIColorFromRGB(0xcccccc)];