IOS中十六進制的顏色轉換為UIColor

#pragma mark - 顏色轉換 IOS中十六進制的顏色轉換為UIColor  
+ (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];  
    }  

    // strip 0X if it appears  
    if ([cString hasPrefix:@"0X"])  
        cString = [cString substringFromIndex:2];  
    if ([cString hasPrefix:@"#"])  
        cString = [cString substringFromIndex:1];  
    if ([cString length] != 6)  
        return [UIColor clearColor];  

    // Separate into r, g, b substrings  
    NSRange range;  
    range.location = 0;  
    range.length = 2;  

    //r  
    NSString *rString = [cString substringWithRange:range];  

    //g  
    range.location = 2;  
    NSString *gString = [cString substringWithRange:range];  

    //b  
    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];  
}  


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