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回答:
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; } }]; }