//
//  UIColor+Hex.m
//  Base64
//
//  Created by zhangzy on 2020/3/13.
//

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

#pragma mark - 颜色转换 iOS中十六进制的颜色转换为UIColor

+ (UIColor *) colorWithHexString: (NSString *)hexString
{
    NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    //hexString应该6到8个字符
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
    
    //如果hexString 有@"0X"前缀
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    
    //如果hexString 有@"#""前缀
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor clearColor];
    
    //RGB转换
    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];
    
    //
    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
