如何自定义聊天页面右上角未读消息控件的字体颜色，背景图片和箭头

技术指南 iOS
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在聊天页子类添加以下方法，具体图片名称请根据自身业务添加

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    //修改文本颜色
    [self.unReadMessageLabel setTextColor:[UIColor redColor]];
    
    //修改按钮整体背景图片
    [self.unReadButton setBackgroundImage:[UIImage imageNamed:@"这里添加想替换的图片名称"]
                                 forState:UIControlStateNormal];
    //修改向上箭头图片
    [self.unReadButton.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if ([obj isKindOfClass:[UIImageView class]]) {
            UIImageView *imageView = (UIImageView *)obj;
            UIImage *image = [UIImage imageNamed:@"这里添加想替换的图片名称"];
            image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(image.size.width * 0.2, image.size.width * 0.8,
                                                                        image.size.width * 0.2, image.size.width * 0.2)
                                          resizingMode:UIImageResizingModeStretch];
            imageView.image = image;
            *stop = YES;
        }
    }];
}