//
//  UIColor+Hex.m
//  luftemed
//
//  Created by 林柏显 on 16/11/8.
//  Copyright © 2016年 林柏显. All rights reserved.
//

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

+ (UIColor *)colorWithHexString:(NSString *)hexColorString {
    if ([hexColorString length] < 6) { // 长度不合法
        return [UIColor blackColor];
    }
    NSString *tempString = [hexColorString lowercaseString];
    if ([tempString hasPrefix:@"0x"]) { // 检查开头是 0x
        tempString = [tempString substringFromIndex:2];
    } else if ([tempString hasPrefix:@"#"]) { // 检查开头是#
        tempString = [tempString substringFromIndex:1];
    }
    if ([tempString length] != 6) {
        return [UIColor blackColor];
    }
    // 分解三种颜色的值
    NSRange range = NSMakeRange(0, 2);
    NSString *rString = [tempString substringWithRange:range];
    range.location = 2;
    NSString *gString = [tempString substringWithRange:range];
    range.location = 4;
    NSString *bString = [tempString substringWithRange:range];
    // 取三种颜色值
    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];
}


@end