[移动开发]iOS15 新特性兼容适配

1.用xcode13编译工程后，导航栏的问题比较明显，原因是UINavigationBar部分属性的设置在iOS15上是无效的。

  if (@available(iOS 15.0, *)) {
        UINavigationBarAppearance *bar = [UINavigationBarAppearance new];
        [bar setBackgroundColor:RPBackGroundColor];
        [bar setBackgroundImage:[UIImage new]];
        bar.shadowColor = [UIColor clearColor];
        self.navigationController.navigationBar.standardAppearance = bar;
        self.navigationController.navigationBar.scrollEdgeAppearance = self.navigationController.navigationBar.standardAppearance;
    }else{
        //导航底部的分割线置为空白
        [self.navigationController.navigationBar setShadowImage:[UIImage new]];
        [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    }

2. 设置导航栏颜色? setBarTintColor 方法失效
?

- (void)navgationSetBarTintColor:(UIColor *)color{
    if (@available(iOS 15.0, *)) {
        UINavigationBarAppearance *bar = [UINavigationBarAppearance new];
        [bar setBackgroundColor:color];
        [bar setBackgroundImage:[UIImage new]];
        bar.shadowColor = [UIColor clearColor];
        self.navigationController.navigationBar.standardAppearance = bar;
        self.navigationController.navigationBar.scrollEdgeAppearance = self.navigationController.navigationBar.standardAppearance;
    }else{
        [self.navigationController.navigationBar setBarTintColor:color];
    }
}

3.tabbar的问题和navigationBar的问题属于同一类，tabbar背景颜色设置失效，字体设置失效，阴影设置失效问题

if (@available(iOS 15.0, *)) {
        UITabBarAppearance *appearance = [UITabBarAppearance new];
        appearance.backgroundColor = [UIColor whiteColor];
        // 设置未被选中的颜色
        appearance.stackedLayoutAppearance.normal.titleTextAttributes = attrs;
        // 设置被选中时的颜色
        appearance.stackedLayoutAppearance.selected.titleTextAttributes = selectedAttrs;
        [appearance setBackgroundColor:[UIColor whiteColor]];
        [appearance setBackgroundImage:[UIImage imageWithColor:[UIColor whiteColor]]];
        [appearance setShadowImage:[UIImage imageWithColor:hexColor(@"#F4F4FF")]];
        self.tabBar.standardAppearance = appearance;
        self.tabBar.scrollEdgeAppearance = self.tabBar.standardAppearance;
    }else{
        UITabBarItem *item = [UITabBarItem appearance];
        [item setTitleTextAttributes:attrs forState:UIControlStateNormal];
        [item setTitleTextAttributes:selectedAttrs forState:UIControlStateSelected];
    }


+ (UIImage *)imageWithColor:(UIColor *)color {
    CGSize size = CGSizeMake(1, 1);
    if (!color || size.width <= 0 || size.height <= 0) return nil;
    CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, color.CGColor);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

3. UITableView

iOS15对于tableview，新增了sectionHeaderTopPadding作为列表每个部分标题上方的填充，默认增加22px，它的默认值是UITableViewAutomaticDimension，所以我们要将他设置为0，否则当我们的列表设置了section高度的列表会出现head高度增加的情况，适配方式：

 if (@available(iOS 15.0, *)) {
         self.sectionHeaderTopPadding = 0;
     }

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