Re: Arc and performSelector
Re: Arc and performSelector
- Subject: Re: Arc and performSelector
- From: glenn andreas <email@hidden>
- Date: Mon, 17 Oct 2011 12:29:50 -0500
On Oct 16, 2011, at 1:58 AM, Gerriet M. Denkmann wrote:
> I have this code:
>
> for( id aThing in someArray )
> {
> if ( [ aThing respondsToSelector: @selector(setTitle:) ] )
> {
> [ self replaceIn: aThing
> readSelector: @selector(title)
> writeSelector: @selector(setTitle:)
> withTable: tableName
> ];
> }
> }
>
>
> - (void)replaceIn: thing readSelector: (SEL)selectorIn writeSelector: (SEL)selectorOut withTable: (NSString *)tableName;
> {
> NSString *key = [ thing performSelector: selectorIn ];
> ...
> NSString *rep = ...
> [ thing performSelector: selectorOut withObject: rep ];
> }
>
> Now, using Arc I am told that "PerformSelector may cause a leak because its selector is unknown".
> What I am supposed to do about this? I really want to have code without warnings.
Based on your samples, why not change this to just use KVC instead?
for (id aThing in someArray)
if ([aThing respondsToSelector: @selector(setTitle:)]) { // too bad there isn't a cleaner way to ask [aThing hasKey: @"title"]
[ self replaceIn: aThing key: @"title" withTable: tableName ];
}
}
- (void) replaceIn: (id) thing key: (NSString *) ivarKey withTable: (NSString *) tableName
{
NSString *key = [thing valueForKey: ivarKey];
...
NSString *rep = ...
...
[ thing setValue: rep forKey: ivarKey];
}
Glenn Andreas email@hidden
The most merciful thing in the world ... is the inability of the human mind to correlate all its contents - HPL
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