分类给Xib添加属性

步骤一

//UIView+Flag.h
#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIView (Flag)

@property (nonatomic, strong) IBInspectable NSString *currentID;

@end

NS_ASSUME_NONNULL_END

步骤二

//UIView+Flag.m
#import "UIView+Flag.h"
#import <objc/runtime.h>

static NSString *DYZFlagKey;

@implementation UIView (Flag)

- (void)setCurrentID:(NSString *)currentID {
    objc_setAssociatedObject(self, &DYZFlagKey, currentID, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (NSString *)currentID {
    return objc_getAssociatedObject(self, &DYZFlagKey);
}

@end

步骤三

3.1、加上IBInspectable之后，出现下图

3.2、填值之后，出现下图；不填值，消失

步骤四

#import "XIbViewController.h"
#import "UIView+Flag.h"

@interface XIbViewController ()

@end

@implementation XIbViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    NSLog(@"%@",self.view.currentID);
}

@end