iOS中（以#开头）十六进制的颜色转换为UIColor(RGB)

#import

@interface UIColor (JKColorChange)

// 颜色转换：iOS中（以#开头）十六进制的颜色转换为UIColor(RGB)

+ (UIColor *) colorWithHexString: (NSString *)color;

@end

#import "UIColor+JKColorChange.h"

@implementation UIColor (JKColorChange)

+ (UIColor *) colorWithHexString: (NSString *)color

{

    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    

    // String should be 6 or 8 characters

    if ([cString length] < 6) {

        return [UIColor clearColor];

    }

    // 判断前缀

    if ([cString hasPrefix:@"0X"])

        cString = [cString substringFromIndex:2];

    if ([cString hasPrefix:@"#"])

        cString = [cString substringFromIndex:1];

    if ([cString length] != 6)

        return [UIColor clearColor];

    // 从六位数值中找到RGB对应的位数并转换

    NSRange range;

    range.location = 0;

    range.length = 2;

    //R、G、B

    NSString *rString = [cString substringWithRange:range];

    range.location = 2;

    NSString *gString = [cString substringWithRange:range];

    range.location = 4;

    NSString *bString = [cString substringWithRange:range];

    // Scan values

    unsigned int r, g, b;

    [[NSScanner scannerWithString:rString] scanHexInt:&r];

    [[NSScanner scannerWithString:gString] scanHexInt:&g];

    [[NSScanner scannerWithString:bString] scanHexInt:&b];

    

    return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];

}