前言

本文主要给大家介绍了关于iOS12适配及问题的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧

版本信息

Xcode: Version 10.0 beta (10L176w)
macOS: 10.14 Beta (18A293u)
iOS: 12.0(16A5288q)

问题及解决过程

1,StatusBar内部结构改变

现象：crash
crash log：
1,-[_UIStatusBarIdentifier isEqualToString:]: unrecognized selector sent to instance 0x283452820
2,Terminating app due to uncaught exception ‘NSInvalidArgumentException', reason: ‘-[_UIStatusBarIdentifier isEqualToString:]: unrecognized selector sent to instance 0x283452820'

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问题代码和解决方法

+ (NSString *)getIphoneXNetWorkStates { UIApplication *app = [UIApplication sharedApplication]; id statusBar = [[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"statusBar"]; id one = [statusBar valueForKeyPath:@"regions"]; id two = [one valueForKeyPath:@"trailing"]; NSArray *three = [two valueForKeyPath:@"displayItems"]; NSString *state = @"无网络"; for (UIView *view in three) { //alert: iOS12.0 情况下identifier的变成了类"_UIStatusBarIdentifier"而不是NSString，所以会在调用“isEqualToString”方法时发生crash， //修改前// NSString *identifier = [view valueForKeyPath:@"identifier"]; //修改后 NSString *identifier = [[view valueForKeyPath:@"identifier"] description]; if ([identifier isEqualToString:@"_UIStatusBarWifiItem.signalStrengthDisplayIdentifier"]) { id item = [view valueForKeyPath:@"_item"]; //alert: 这个问题和上边一样itemId是_UIStatusBarIdentifier 类型，不是string NSString *itemId = [[item valueForKeyPath:@"identifier"] description]; if ([itemId isEqualToString:@"_UIStatusBarWifiItem"]) { state = @"WIFI"; } state = @"不确定"; } else if ([identifier isEqualToString:@"_UIStatusBarCellularItem.typeDisplayIdentifier"]) { UIView *statusBarStringView = [view valueForKeyPath:@"_view"]; // 4G/3G/E state = [statusBarStringView valueForKeyPath:@"text"]; } } return state;}

总结

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