iOS RGB颜色封装

使用类别创建

.h文件

#import <UIKit/UIKit.h>

@interface UIColor (HexColor)

+ (UIColor *)colorWithHex:(NSString *)hex;

@end

.m文件

#import "UIColor+HexColor.h"

@implementation UIColor (HexColor)

+ (UIColor *)colorWithHex:(NSString *)hex {
    unsigned int red, green, blue;
    NSRange range;
    range.length = 2;

    range.location = 0;
    if (hex.length == 7) {
        range.location = 1;
    }
    [[NSScanner scannerWithString:[hex substringWithRange:range]]scanHexInt:&red];
    range.location += 2;
    [[NSScanner scannerWithString:[hex substringWithRange:range]]scanHexInt:&green];
    range.location += 2;
    [[NSScanner scannerWithString:[hex substringWithRange:range]]scanHexInt:&blue];

    return [UIColor colorWithRed:(float)(red / 255.0) green:(float)(green / 255.0) blue:(float)(blue / 255.0) alpha:1.0];
}

@end