iOS13中 UITabBar隐藏线条、定位不起作用问题

1. 隐藏线条处理   

    CGRect rect = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);     UIGraphicsBeginImageContext(rect.size);     CGContextRef context = UIGraphicsGetCurrentContext();     CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);     CGContextFillRect(context, rect);     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();     if (@available(iOS 13.0, *)) {         UITabBarAppearance *tabBarAppearance = [self.tabBar.standardAppearance copy];         [tabBarAppearance setBackgroundImage:img];         [tabBarAppearance setShadowColor:[UIColor clearColor]];         [self.tabBar setStandardAppearance:tabBarAppearance];     } else {         [self.tabBar setBackgroundImage:img];         [self.tabBar setShadowImage:img];     }

 

2. 更改UITababr的位置

    之前是放在viewWillLayoutSubviews 里面的，但从iOS13开始，放到这个方法里面修改位置不再起作用。需要放到viewDidLayoutSubviews里面

    - (void)viewDidLayoutSubviews{         [super viewDidLayoutSubviews];

        CGRect tabFrame = self.tabBar.frame;         tabFrame.size.height = 44;         tabFrame.origin.y = 27;         self.tabBar.frame = tabFrame;     }