1、UIAlertController的创建
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"您的账号在其他地方登录" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *yesAction = [UIAlertAction actionWithTitle:@"登录" style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {
NSLog(@"yes");
}];
UIAlertAction *noAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {
NSLog(@"no");
}];
[alertController addAction:noAction];
[alertController addAction:yesAction];
[self presentViewController:alertController animated:YES completion:nil];
2、添加在AppDelegate中的方法
UIWindow *alertWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; alertWindow.rootViewController = [[UIViewController alloc] init];
alertWindow.windowLevel = UIWindowLevelAlert + 1;
[alertWindow makeKeyAndVisible];
[alertWindow.rootViewController presentViewController:alertController animated:YES completion:nil];
