在另一个ViewController中更改属性 [英] change a property in another viewcontroller

问题描述

我已经搜索了如何在stackoverflow上从另一个ViewController运行方法，但没有找到答案. 我有一个ViewController1使用AVAudioPlayer播放音频，我希望我的ViewController2能够更改其音量.

I've searched how to run a method from another ViewController on stackoverflow and didn't find an answer. I have a ViewController1 playing an audio using AVAudioPlayer and I want my ViewController2 to be able to change it's volume.

我尝试了以下基本操作:在ViewController2中调用一个方法来更改ViewController1中的音量.
这是行不通的.该方法可以输出日志，但不能更改属性.

I've tried the basic: calling a method in ViewController2 that changes the volume in ViewController1.
This doesn't work. The method is able do output Logs but isn't able to change properties.

谢谢

推荐答案

您需要将消息从ViewController2传递到ViewController1.
为此，请使用:
1.通知
2.委派

You need to pass a message from ViewController2 to ViewController1.
For that either use:
1. Notifications
2. Delegation

如果您不知道这两个教程，则这里是本教程的链接.
http://devinsheaven.com/对象通知之间的可可教程传递消息-代理和目标动作/

Here is the link for a tutorial if you are unaware of both of them.
http://devinsheaven.com/cocoa-tutorial-passing-messages-between-objects-notifications-delegates-and-target-action/

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