“名称”不可用：在 iOS - XCode11 上不可用

Question

After upgrading from XCode 10.0 to 11

I am getting the error 'name' is unavailable: not available on iOS

This is during Build for Swift 4.2 on XCode 11.0 and 11.1, I can still build using XCode 10

This is happening in the code of one of the Objective C external libraries we have been using through Cocopods.

return [(NSNumber *)[table[state] objectForKey:[rule name]] unsignedIntegerValue];

I can work around the issue by renaming the variable name to ruleName , but I would rather not do this.

Why is Xcode objecting to a variable name of name? Is this an Xcode but or is it something I can fix in the build settings

Edit

The specific pod is NUI 0.5.5

In module NUIPShiftReduceGotoTable.m

- (NSUInteger)gotoForState:(NSUInteger)state rule:(NUIPRule *)rule
{
    return [(NSNumber *)[table[state] objectForKey:[rule name]] unsignedIntegerValue];
}

Answer 1

Apple made a change that can break previously compiling code in Xcode 11.0/11.1. Previously the compiler would be fine with passing the 'name' message to an object that it didn't know the type of. This can happen for many reasons in the weakly typed Objective-C world.

Currently in Xcode 11.1 you can do.

id x = nil;
[x name];

And this will compile, no problem. But:

NSObject *x = nil
[x name];

won't compile due to the compiler identifying the most likely selector being the API_UNAVAILABLE one in NSLayoutAnchor.h (maybe).

If the compiler had more information it can map the correct selector. This might be as simple as including the header for whatever has name property in the.m file that is failing.

My guess is something like in NUIPShiftReduceGotoTable.m you add a line #import"NUIPRule.h"