在viewDidLoad中添加以下代码
UIImageView *bgshow = [UIImageView new];
[bgshow setFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.bounds), 0.5)];
bgshow.backgroundColor = [UIColor colorWithRed:23.0 / 255.0 green:28.0 / 255.0 blue:36.0 / 255.0 alpha:0.3];
[self.view.viewForBaselineLayout addSubview:bgshow];
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