iOS15适配小结

//设置navigationBar颜色
self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
//设置tabBar背景色
self.tabBarController.tabBar.backgroundColor = [UIColor blueColor];
//设置tabBarItem字体颜色
NSMutableDictionary<NSAttributedStringKey, id> *nORMalAttributes = [NSMutableDictionary dictionary];
[normalAttributes setValue:[UIColor blueColor] forKey:NSForegroundColorAttributeName];

[self.tabBarItem setTitleTextAttributes:normalAttributes.copy forState:UIControlStateNormal];
[self.tabBarItem setTitleTextAttributes:normalAttributes.copy forState:UIControlStateSelected];

UITabBarAppearance *appearance = [[UITabBarAppearance alloc] init];
//tabBaritem title选中状态颜色
appearance.stackedLayoutAppearance.selected.titleTextAttributes = @{
    NSForegroundColorAttributeName:[UIColor blueColor],
};
//tabBaritem title未选中状态颜色
appearance.stackedLayoutAppearance.normal.titleTextAttributes = @{
    NSForegroundColorAttributeName:[UIColor blueColor],
};
//tabBar背景颜色
appearance.backgroundColor = [UIColor blackColor];
self.tabBarItem.scrollEdgeAppearance = appearance;
self.tabBarItem.standardAppearance = appearance;

UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
appearance.backgroundColor = [UIColor blackColor];
self.navigationBar.standardAppearance = appearance;
self.navigationBar.scrollEdgeAppearance = appearance;

/// Determines if the table view allows its cells to become focused.
/// When tableView:canFocusRowAtIndexPath: is implemented, its return value takes precedence over this method.
/// Defaults to a system derived value based on platform and other properties of the table view.
@property (nonatomic, getter=isPrefetchingEnabled) BOOL prefetchingEnabled

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

if (@available(iOS 15.0, *)) {
    [UITableView appearance].sectionHeaderTopPadding = 0;
}