How to create an "array of selectors"

user_141146 0
Viewed 19830

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?

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;
}
selector nsarray objective-c ios
6 Answers

Could you store strings and use NSSelectorFromString?

From the docs

NSSelectorFromString

Returns the selector with a given name.

SEL NSSelectorFromString (
   NSString *aSelectorName
);
user_2509750

This creates an object out of selector: 

[NSValue valueWithPointer:@selector(x)]
user_1188780

Why not just use a simple C array?

static const SEL selectors[] = {@selector(method1),
                                ....
                                @selector(method7)};

...

for (int i = 0; i < sizeof(selectors)/sizeof(selectors[0]); i++) {
  [self performSelector:selectors[i]];
  // ....
}
user_2246710

I'd like to supplement two methods of storing selectors in an array,

First, NSPointerArray can store opaque pointer, such as SEL, as Apple doc said,

NSPointerArray *selectors = [[NSPointerArray alloc] initWithOptions: NSPointerFunctionsOpaqueMemory];
[selectors addPointer:@selector(onSendButton:)];
[button addTarget: self action:[selectors pointerAt:0] forControlEvents:UIControlEventTouchUpInside];

Second, C-style array is much simpler,

SEL selectors[] = { @selector(onSendButton:) };
[button addTarget: self action:selectors[0] forControlEvents:UIControlEventTouchUpInside];

Choose any as you wish.

user_11072420
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