UIAlertController的使用

样式一：

UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction* phone = [UIAlertAction actionWithTitle:@"客服-4006200365" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSMutableString* str=[[NSMutableString alloc] initWithFormat:@"telprompt://%@",@"4006200365"];
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
    }];
    
    UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    
    [alert addAction:phone];
    [alert addAction:cancel];
    
    [self presentViewController:alert animated:YES completion:nil];

样式二：

 
  UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil message:@"权限码(参见出厂文件Admin Code)" preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"权限码(参见出厂文件Admin Code)";
    }];
    
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"000000";
        textField.secureTextEntry = YES;
    }];
    
    UIAlertAction* confirm = [UIAlertAction actionWithTitle:@"确定 Yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        //
    }];
    
    UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"取消 Cancel" style:UIAlertActionStyleCancel handler:nil];
    
    [alert addAction:confirm];
    [alert addAction:cancel];
    
    [self presentViewController:alert animated:YES completion:nil];