颜色转换
+ (UIColor *) colorWithHexString: (NSString *) stringToConvert
{
?
? ? NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
?
? ? // String should be 6 or 8 characters
? ? if ([cString length] < 6) return nil;
?
? ? // 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 nil;
? ? // Separate into r, g, b substrings
? ? NSRange range;
? ? range.location = 0;
? ? range.length = 2;
? ? 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];
}
