i'm using the iphone sdk (3.0) and i'm trying to create an array of selectors to invoke a variety of methods within one class.
Obviously, I'm doing something wrong (I think @selector isn't considered a class and so stuffing them into an NSArray isn't working).
I tried this, but it's obviously wrong.
Is there a simple way to have an array of selectors like this? Or is there a better way to iterate through a collection of methods?
Thanks for any insight!!
selectors = [NSArray arrayWithObjects:
@selector(method1),
@selector(method2),
@selector(method3),
@selector(method4),
@selector(method5),
@selector(method6),
@selector(method7), nil];
for (int i = 0; i < [selectors count]; i++) {
if ([self performSelector:[selectors objectAtIndex:i]]) // do stuff;
}
Source: Tips4all, CCNA FINAL EXAM
Could you store strings and use NSSelectorFromString?
ReplyDeleteFrom the docs
NSSelectorFromString
Returns the selector with a given name.
SEL NSSelectorFromString (
NSString *aSelectorName
);
This creates an object out of selector:
ReplyDelete[NSValue valueWithPointer:@selector(x)]
Why not just use a simple C array?
ReplyDeletestatic const SEL selectors[] = {@selector(method1),
....
@selector(method7)};
...
for (int i = 0; i < sizeof(selectors)/sizeof(selectors[0]); i++) {
[self performSelector:selectors[i]];
// ....
}
You can also create an array of NSInvocations. This is handy if you need an argument to go with your selector.
ReplyDeleteNSMethodSignature *sig = [[yourTarget class] instanceMethodSignatureForSelector:yourSEL];
NSInvocation *inv = [NSInvocation invocationWithMethodSignature:sig];
[inv setTarget:yourTarget];
[inv setSelector:yourSEL];
[inv setArgument:&yourObject atIndex:2]; // Address of your object