iOS13的适配

不久前，苹果WWDC19开发者大会在美国加州圣何塞举行。这次大会上，苹果公布了 iOS13的更新内容，今天我们来看看如何适配 iOS13.

• WWDC19视频
• Xcode 11 beta 下载
• macOS Catalina 10.15 beta 下载

第三方登录

Sign In with Apple will be available for beta testing this summer. It will be required as an option for users in apps that support third-party sign-in when it is commercially available later this year.

如果 APP 支持三方登陆（Facbook、Google、微信、QQ、支付宝等），就必须支持苹果登录，且要放前边.

Sign in with Apple 设计规范

黑夜模式

Apps on iOS 13 are expected to support dark mode Use system colors and materials Create your own dynamic colors and images Leverage flexible infrastructure

审核强制要求适配黑夜模式。

// 模式强制切换
if (darkMode) {
    if (@available(iOS 13.0, *)) {
        [UIApplication sharedApplication].keyWindow.overrideUserInterfaceStyle = UIUserInterfaceStyleDark;
    }
} else {
    if (@available(iOS 13.0, *)) {
        [UIApplication sharedApplication].keyWindow.overrideUserInterfaceStyle = UIUserInterfaceStyleLight;
    }
}
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已知问题：

• YYLabel 如果使用了 textLayout属性，切换模式的时候 无法自动修改layout文本的颜色
• 内嵌WebView，需要手动修改css样式

KVC 限制

iOS13以后已经不能肆无忌惮的通过 KVC来修改一些没有暴露出来的属性了。

*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Access to xxx's _xxx ivar is prohibited. This is an application bug'

已知：

// UITextField 的 _placeholderLabel
[textField setValue:[UIColor xxx] forKeyPath:@"_placeholderLabel.textColor"];

// UISearchBar 的 _searchField
[searchBar valueForKey:@"_searchField"];
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模态弹出默认交互改变

/*
 Defines the presentation style that will be used for this view controller when it is presented modally. Set this property on the view controller to be presented, not the presenter.
 If this property has been set to UIModalPresentationAutomatic, reading it will always return a concrete presentation style. By default UIViewController resolves UIModalPresentationAutomatic to UIModalPresentationPageSheet, but other system-provided view controllers may resolve UIModalPresentationAutomatic to other concrete presentation styles.
 Defaults to UIModalPresentationAutomatic on iOS starting in iOS 13.0, and UIModalPresentationFullScreen on previous versions. Defaults to UIModalPresentationFullScreen on all other platforms.
 */
@property(nonatomic,assign) UIModalPresentationStyle modalPresentationStyle API_AVAILABLE(ios(3.2));
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iOS 13的 presentViewController默认有视差效果，模态出来的界面现在默认都下滑返回。 一些页面必须要点确认才能消失的，需要适配。如果项目中页面高度全部是屏幕尺寸，那么多出来的导航高度会出现问题。

// Swift
self.modalPresentationStyle = .fullScreen

// Objective-C
self.modalPresentationStyle = UIModalPresentationFullScreen;
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UISegmentedControl 默认样式改变

默认样式变为白底黑字，如果设置修改过颜色的话，页面需要修改

UITabbar 层次发生改变，无法通过设置 shadowImage去掉上面的线

可以参考 腾讯 QMUIKit 里面的实现

App启动过程中，部分View可能无法实时获取到frame

可能是为了优化启动速度，App 启动过程中，部分View可能无法实时获取到正确的frame

// 只有等执行完 UIViewController 的 viewDidAppear 方法以后，才能获取到正确的值，在viewDidLoad等地方 frame Size 为 0，例如：
 [[UIApplication sharedApplication] statusBarFrame];
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之前标记为 API_DEPRECATED 部分类被移除

*** Terminating app due to uncaught exception 'NSGenericException', reason: 'UISearchDisplayController is no longer supported when linking against this version of iOS. Please migrate your application to UISearchController.'
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其他参考：

ChenYilong/iOS13AdaptationTips

[deviceToken description] 获取到的格式发生变化

#include <arpa/inet.h>
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    if (![deviceToken isKindOfClass:[NSData class]]) return;
    const unsigned *tokenBytes = [deviceToken bytes];
    NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                          ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                          ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                          ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
    NSLog(@"deviceToken:%@",hexToken);
}
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参考:developer.umeng.com/docs/66632/…

CNCopyCurrentNetworkInfo 变化

 An app that fails to meet any of the above requirements receives the following return value:

- An app linked against iOS 12 or earlier receives a dictionary with pseudo-values. In this case, the SSID is Wi-Fi (or WLAN in the China region), and the BSSID is 00:00:00:00:00:00.
- An app linked against iOS 13 or later receives NULL.
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iOS13 以后只有开启了 Access WiFi Information capability，才能获取到 SSID 和 BSSID

参考：CNCopyCurrentNetworkInfo

作者：toss156
链接：https://juejin.im/post/5d00af64e51d455d88219ee2
来源：掘金
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