避免“[超类]可能不会响应[选择器]”警告，而不会引发 LLVM 的“无法转换‘super’”错误
我在 NSView 子类中有以下代码：
- (id)forwardingTargetForSelector:(SEL)aSelector
{
if ([super respondsToSelector:@selector(forwardingTargetForSelector:)]) {
// cast to (id) to avoid "may not respond to selector" warning
return [(id)super forwardingTargetForSelector:aSelector];
} else {
[self doesNotRecognizeSelector:aSelector];
return nil;
}
}
在第一行中， return [(id)super ... 将 super 转换为 id 因为在 GCC 编译器下，这抑制了超类 (NSView) 可能不会响应 forwardingTargetForSelector: 的警告，如 诸如此类的答案。
但是，当我切换到 LLVM 编译器时，这会导致“无法转换超级”错误。有没有正确的方法来修改我的代码，以便我在 LLVM 和 GCC 下都不会收到警告或错误？
I have the following code in an NSView subclass:
- (id)forwardingTargetForSelector:(SEL)aSelector
{
if ([super respondsToSelector:@selector(forwardingTargetForSelector:)]) {
// cast to (id) to avoid "may not respond to selector" warning
return [(id)super forwardingTargetForSelector:aSelector];
} else {
[self doesNotRecognizeSelector:aSelector];
return nil;
}
}
In the first line, return [(id)super ... casts super to id because under the GCC compiler, this suppressed the warning that the superclass (NSView) may not respond to forwardingTargetForSelector:, as suggested in answers such as this one.
However, when I switch to the LLVM compiler, this results in a "Cannot cast super" error. Is there a correct way to modify my code so that I get neither the warning nor the error under both LLVM and GCC?
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在实现文件中的仅接口类别中声明选择器。
Declare the selector in an interface-only category in your implementation file.