MethodChaining

alertController通过点语法添加action和textField， 具体实现：

HGAlertViewController * alertVC = [HGAlertViewController alertControllerWithTitle:@"提示" message:@"选择" preferredStyle:(UIAlertControllerStyleAlert)];
    
    alertVC.addInput(@"输入账号",^(UITextField *textField){
        
        [[textField rac_textSignal] subscribeNext:^(id x) {
                NSLog(@"%@",textField.text);
        }];
    }).addAction(@"取消",^(UIAlertAction * action){
        NSLog(@"取消");
    }).addAction(@"确定",^(UIAlertAction *action){
        NSLog(@"确定");
    });
    [self presentViewController:alertVC animated:true completion:nil];

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