1.StatusBar内部结构改变
现象：crash
crash log：
-[_UIStatusBarIdentifier isEqualToString:]: unrecognized selector sent to instance 0x283452820
* 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;
}
2.[UIImage imageNamed:]不能正常加载Assets中的图片
解决：
将图片放到bundle中
使用一下方式加载即可
NSString *path = [[NSBundle mainBundle] pathForResource:@"bg_login" ofType:@"png"]; _backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:path]];
这个不能正常加载的情况只出现在个别的地方，目前找到的共性是加载的图片偏大.
其他bug 参考