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xcode 13更新后出现的bug

xcode 13更新后出现的bug

作者: 哎呦我去叫什么呢 | 来源:发表于2021-12-22 09:45 被阅读0次

    UITableView sectionHeader下移22像素?

    swift
    
    if#available(iOS15.0, *) {
    
                self.mainTableView.sectionHeaderTopPadding =0        }
    
    OC
     if(@available(iOS15.0, *)) {
    
                _downloadTableView.sectionHeaderTopPadding = 0;
    
            }
    

    导航背景颜色修改无效?

    swift
    
    if #available(iOS 15.0, *) {
    
                let appearance = UITabBarAppearance()
    
                appearance.configureWithOpaqueBackground()
    
                if darkMode {
    
                    appearance.backgroundColor = UIColor.darkBackgroundColour
    
                } else {
    
                    appearance.backgroundColor = .white
    
                }
    
                appearance.shadowImage = nil
    
      appearance.shadowColor = nil
    
                appDelegate.tabBarController.tabBar.standardAppearance = appearance
    
                appDelegate.tabBarController.tabBar.scrollEdgeAppearance = appDelegate.tabBarController.tabBar.standardAppearance
    
            }
    
    
    
    OC
    
    if (@available(iOS 15.0, *)) {
    
            UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];
    
            barApp.backgroundColor = [[UIColor blueColor] colorWithAlphaComponent:0.5];
    
            self.navigationController.navigationBar.scrollEdgeAppearance = barApp;
    
            self.navigationController.navigationBar.standardAppearance = barApp;
    }
    

    UINavigationBar
    UINavigationBar 部分属性的设置在 iOS15 上是无效的,iOS15navigationBar 的相关属性设置要通过实例 UINavigationBarAppearance 来实现,UINavigationBarAppearance 是 iOS13 更新的 API,应该有人已经在用,我们的应用兼容 iOS10 以上,对于导航栏的设置还没有使用 UINavigationBarAppearance,如今在 iOS15 上失效,所以对于呈现的问题,做如下适配:

    解决方法

    主要是以下两个属性 (UINavigationController 的属性)

    // 静止样式
    self.navigationBar.standardAppearance;
    // 滚动样式
    self.navigationBar.scrollEdgeAppearance;
    swift
            if #available(iOS 13.0, *) {
                let appearance = UINavigationBarAppearance()
                  // 设置导航栏背景色
                appearance.backgroundColor = .white
                  // 去除导航栏阴影(如果不设置clear,导航栏底下会有一条阴影线)
                appearance.shadowColor = UIColor.clear
                  // 字体颜色、尺寸等
                appearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
                // 带scroll滑动的页面
                navigationController?.navigationBar.scrollEdgeAppearance = appearance
                // 常规页面
                navigationController?.navigationBar.standardAppearance = appearance 
            }
    
    OC 
        if (@available(iOS 13.0, *)) {
            UINavigationBarAppearance * appearance = [[UINavigationBarAppearance alloc] init];
            // 背景色
            appearance.backgroundColor = [UIColor whiteColor];
            // 去除导航栏阴影(如果不设置clear,导航栏底下会有一条阴影线)
            appearance.shadowColor = [UIColor clearColor];
            // 设置字体颜色、尺寸等
            appearance.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor redColor]};
            // 带scroll滑动的页面
            self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
            // 常规页面
            self.navigationController.navigationBar.standardAppearance = appearance;
        }
    

    导航栏隐藏的返回按钮失效问题
    swift

    //appdelegate全局设置
    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-200, 0) forBarMetrics:UIBarMetricsDefault];
        // iOS 15适配
        if (@available(iOS 13.0, *)) {
            UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
            [appearance setBackgroundColor:[UIColor whiteColor]];
            // UINavigationBarAppearance 会覆盖原有的导航栏设置,这里需要重新设置返回按钮隐藏,不隐藏可注释或删掉
            appearance.backButtonAppearance.normal.titlePositionAdjustment = UIOffsetMake(-200, 0);
    
            [[UINavigationBar appearance] setScrollEdgeAppearance: appearance];
            [[UINavigationBar appearance] setStandardAppearance:appearance];
        }
    
    

    UITabbar
    tabbar 背景颜色设置失效

            if #available(iOS 13.0, *) { 
                let appearance = UITabBarAppearance()
               // 背景色
                appearance.backgroundColor = .white
                tabBar.standardAppearance = appearance
                if #available(iOS 15.0, *) {
                    tabBar.scrollEdgeAppearance = appearance
                }
            } 
    

    OC

        if (@available(iOS 13.0, *)) { 
            UITabBarAppearance * appearance = [[UITabBarAppearance alloc] init];
             // 背景色
            appearance.backgroundColor = [UIColor whiteColor];
            self.tabBar.standardAppearance = appearance; 
            if (@available(iOS 15.0, *)) {
                self.tabBar.scrollEdgeAppearance = appearance;
            }
        }
    

    iOS 15 的 UITableView 新增了一条新属性:sectionHeaderTopPadding, 默认会给每一个 section header 增加一个高度,当我们使用 UITableViewStylePlain 初始化 UITableView 的时候,能发现 sectionHeader 增高了 22px。

    /// Padding above each section header. The default value is `UITableViewAutomaticDimension`.
        @available(iOS 15.0, *)
        open var sectionHeaderTopPadding: CGFloat
        
    //iOS 15中tableView会给每一个section的顶部(header以上)再加上一个22像素的高度,形成一个section和section之间的间距
    
      if #available(iOS 15.0, *) {
          tableView.sectionHeaderTopPadding = 0
      }
    
    //或者appdelegate全局设置
      if #available(iOS 15.0, *) { 
         UITableView.appearance().sectionHeaderTopPadding = 0
       }
    OC
        if (@available(iOS 15.0, *)) { 
            tableView.sectionHeaderTopPadding = 0;
        }
    
     //或者appdelegate全局设置 
        if (@available(iOS 15.0, *)) {
            [UITableView appearance].sectionHeaderTopPadding = 0;
        }
    

    原文链接:https://www.jianshu.com/p/10c7921e6d76

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