问题
I have a UIWebView on my main window. Can I control that via my second view controller? If so could you give me an example?
回答1:
Yes you can. The "how" is a basic Cocoa / application architecture subject you can learn from the introductory documentation from Apple or any number of other web sites.
The gist is that you need to have a reference to the web view's controller (or the web view itself) from the second controller. This could be an outlet or a regular instance variable in the second controller. Then it's a matter of calling [firstController makeTheWebViewDoSomething];.
See also Communicating with Objects.
回答2:
If you have a "parent" view that owns both the WebView and the other subview from which you want to control.
In the "second view" create a member variable (assign @property and @synthesize, too):
MyUIViewController *parent
After creating the "second" view, call:
[[self secondview] setParent:self];
Now from the second view, to do something to the WebView, do whatever you want, like:
[[parent webview] goback];
来源：https://stackoverflow.com/questions/4026372/cross-view-communication