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'
———————————————————————————————
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;
}
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