如何修复此警告:“找不到方法(返回类型默认为 'id')" [英] How do I fix this warning: "Method not found (return type defaults to 'id')"

问题描述

我正在尝试从我的 iPhone 应用程序中删除其中一些警告.我得到最多的是当我有一个 void 函数并使用 [self myFunction]; 调用它时.警告在我调用函数的那一行，它说:找不到方法'-myFunction'(返回类型默认为'id')."我需要做什么来解决这个问题?谢谢

I am trying to get rid of some of these warnings from my iPhone application. The one I get the most is when I have a void function and I call it using [self myFunction];. The warning is on the line where I call the function and it says: "Method '-myFunction' not found (return type defaults to 'id')." What do I need to do to fix this? Thanks

推荐答案

在你的头文件中声明函数，像这样:

Declare the function in your header file, like so:

 -(void)myFunction;

或

 -(NSString*)myFunction;
 -(id)myFunction;
 -(NSInteger)myFunction;
 -(BOOL)myFunction;

等等等等

这比仅仅让编译器静音更重要:如果函数的返回类型不是指针(id 或 anything*)，尤其是当它不'没有相同的大小，你可能会变得非常奇怪并且很难找到错误.

This is of more importance than just silencing the compiler: if the return type of a function is not a pointer (id or anything*), especially when it doesn't have the same size, you can get really odd and hard to find bugs.

例如如果一个函数返回一个 CGRect 结构，并且编译器假定 id (如警告所说)，就会发生非常奇怪的事情.

E.g. if a function returns a CGRect struct, and the compiler assumes id (as the warning says), really weird things will happen.

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