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UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"错误" message:@"请先安装微信客户端" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionConfirm = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:nil];
[alert addAction:actionConfirm];
[self presentViewController:alert animated:YES completion:nil];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"已经登录" message:@"您已经登录" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击确认");
[self.navigationController pushViewController:[UserViewController new] animated:YES];
}]];
[self presentViewController:alert animated:YES completion:nil];
只显示几秒
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"已推出" message:nil preferredStyle:UIAlertControllerStyleAlert];
[self presentViewController:alert animated:YES completion:nil];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
});
