Preface
This article mainly introduces relevant content about iOS12 adaptation and problems. We will share it for your reference and learning. I won’t say much below. Let’s take a look at the detailed introduction together.
Version information
Xcode: Version 10.0 beta (10L176w)
macOS: 10.14 Beta (18A293u)
iOS: 12.0(16A5288q)
Problem and resolution process
1. StatusBar internal structure changes
Phenomenon: 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'
———————————————————————————————
Problem code and solution
+ (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 = @"No network";
for (UIView *view in three) {
//alert: In iOS12.0, the identifier becomes the class "_UIStatusBarIdentifier" instead of NSString, so crash occurs when the "isEqualToString" method is called. //Before modification// NSString *identifier = [view valueForKeyPath:@"identifier"];
//After modification NSString *identifier = [[view valueForKeyPath:@"identifier"] description];
if ([identifier isEqualToString:@"_UIStatusBarWifiItem.signalStrengthDisplayIdentifier"]) {
id item = [view valueForKeyPath:@"_item"];
//alert: This problem is the same as above itemId is type _UIStatusBarIdentifier, not string NSString *itemId = [[item valueForKeyPath:@"identifier"] description];
if ([itemId isEqualToString:@"_UIStatusBarWifiItem"]) {
state = @"WIFI";
}
state = @"uncertain";
} else if ([identifier isEqualToString:@"_UIStatusBarCellularItem.typeDisplayIdentifier"]) {
UIView *statusBarStringView = [view valueForKeyPath:@"_view"];
// 4G/3G/E
state = [statusBarStringView valueForKeyPath:@"text"];
}
}
return state;
}
Summarize
The above is the entire content of this article. I hope that the content of this article has a certain reference value for everyone's study or work. If you have any questions, you can leave a message to communicate. Thank you for your support.