首先创建一个类 继承与UIview 名字先叫做 UIColor+ColorChange 吧！

我们在UIColor+ColorChange.h 文件中写

#ifndef UIColor_ColorChange_h
#define UIColor_ColorChange_h
#import <UIKit/UIKit.h>

@interface UIColor (ColorChange)

// 颜色转换：iOS中（以#开头）十六进制的颜色转换为UIColor(RGB)
+ (UIColor *) colorWithHexString: (NSString *)color;

@end

#endif /* UIColor_ColorChange_h */

之后我们在UIColor+ColorChange.m中写

#import <Foundation/Foundation.h>
#import "UIColor+ColorChange.h"

@implementation UIColor (ColorChange)

+ (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];
    }
    // 判断前缀
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor clearColor];
    // 从六位数值中找到RGB对应的位数并转换
    NSRange range;
    range.location = 0;
    range.length = 2;
    //R、G、B
    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];
}
@end

之后在你所界面中 （引入头文件）！ 定义宏定义 !!! 定义宏定义 !!! 定义宏定义 !!!
![Uploading 69CE7C9B-69CF-4E0E-AB50-54D5710B1A2F_588784.png . . .]

#define HEXCOLOR(hex) [UIColor colorWithRed:((float)((hex & 0xFF0000) >> 16)) / 255.0 green:((float)((hex & 0xFF00) >> 8)) / 255.0 blue:((float)(hex & 0xFF)) / 255.0 alpha:1]

整体代码如下

#import "ViewController.h"
#import "UIColor+ColorChange.h"
#define HEXCOLOR(hex) [UIColor colorWithRed:((float)((hex & 0xFF0000) >> 16)) / 255.0 green:((float)((hex & 0xFF00) >> 8)) / 255.0 blue:((float)(hex & 0xFF)) / 255.0 alpha:1]
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor colorWithHexString:@"#00F5FF"];
    
    UILabel * colorlabel = [[UILabel alloc]initWithFrame:CGRectMake(0,60, self.view.frame.size.width, 40)];
    colorlabel.backgroundColor = [UIColor colorWithHexString:@"#FFFACD"];
    [self.view addSubview:colorlabel];
    
    UILabel * colorlabel1 = [[UILabel alloc]initWithFrame:CGRectMake(0,180, self.view.frame.size.width, 40)];
    colorlabel1.backgroundColor = [UIColor colorWithHexString:@"#FA8072"];
    [self.view addSubview:colorlabel1];
}
@end

颜色色值表
file:///Users/apple/Downloads/RGB颜色对照表.html

22.png

感觉有帮助的话给小编点个喜欢哈

       🌹人生应用七彩涂抹，生活应用踏实铺陈，日子应用充实贯穿。心中怀有使命感，失落感，危机感的人才是不平凡的人🌹

共勉