旧代码给出“未使用的参数”错误,但从来没有现在 [英] Old code gives "Unused parameter" error but never has before now

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问题描述

我打开了一些旧的iOS代码,当我尝试构建它我得到一个未使用的参数错误代码如下:

   - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
NSLog(@Search Bar is not used in this function);
}

这是我第一次看到Objective-C编译器吐出错(不是警告)。因为很多iOS调用不一定使用传递的参数(例子是很多回调),我需要帮助消除这个。

解决方案

解决方案#1)



在Xcode项目的Build Settings中,有一个Unused Parameters参数。



重置为从 YES NO



2(可用Xcode 4):



在Xcode 4.3.2或更高版本中,使用 __未使用

(谢谢Tim Bodeit的评论如下)



解决方案3)



在您的程式码中加入 #pragma unused(searchBar)














$ b code> - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
#pragma unused(searchBar)
NSLog(@Search Bar is not used in this function
}


I've opened up some old iOS code and when I try to build it I get an "unused parameter" error for code like this:

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
    NSLog(@"Search Bar isn't used in this function");
}

This is the first time I've ever seen an Objective-C compiler spit out errors (not warnings) for this. Since a lot of iOS calls don't necessarily use the passing arguments (examples being a lot of callbacks), I need help in getting rid of this.

解决方案

Solution # 1)

In your Xcode project's "Build Settings", there's a parameter for "Unused Parameters".

Reset that from YES to NO.

Solution # 2 (available with Xcode 4):

In Xcode 4.3.2 or higher use __unused.

(THANKS to Tim Bodeit's comment below)

Solution # 3)

Put #pragma unused (searchBar) in your code, preferably right underneath the line in your implementation where the function is declared.

I.E.

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
    #pragma unused (searchBar)
    NSLog(@"Search Bar isn't used in this function");
}

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