#import "ViewController.h"#import "UIColor+Hex.h"#define XMGColor(r,g,b) [UIColor colorWithRed:(r) / 256.0 green:(g) / 256.0 blue:(b) / 256.0 alpha:1]@interface ViewController ()@property (weak, nonatomic) IBOutlet UILabel *labelView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    UIColor *color = [UIColor colorWithRed:213 / 255.0 green:213 / 255.0 blue:213 / 255.0 alpha:1];    _labelView.textColor = [UIColor colorWithHexString:@"eb3535"];//    _labelView.textColor = XMGColor(255 , 255, 255);}/*    颜色:3种颜色通道 R G B    颜色表达方式        24位        32位    每一个颜色通道是8位,0~256    R:213 G:213 B:213     #ffffff    R:FF => 10进制 255    G:FF 255    B:FF 255     #:美工16进制表示形式    0x:OC16进制表达式 */- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

#import <UIKit/UIKit.h>@interface UIColor (Hex)// 默认alpha位1+ (UIColor *)colorWithHexString:(NSString *)color;//从十六进制字符串获取颜色，//color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha;@end

#import "UIColor+Hex.h"@implementation UIColor (Hex)+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{    //删除字符串中的空格    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];    // String should be 6 or 8 characters    if ([cString length] < 6)    {        return [UIColor clearColor];    }    // strip 0X if it appears    //如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾    if ([cString hasPrefix:@"0X"])    {        cString = [cString substringFromIndex:2];    }    //如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾    if ([cString hasPrefix:@"#"])    {        cString = [cString substringFromIndex:1];    }    if ([cString length] != 6)    {        return [UIColor clearColor];    }        // Separate into r, g, b substrings    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];        // 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:alpha];}//默认alpha值为1+ (UIColor *)colorWithHexString:(NSString *)color{    return [self colorWithHexString:color alpha:1.0f];}@end