Call “(id)sender” method in Xcode

问题

Here is the method I wish to call:

- (void)myMethod:(id)sender {

How would I call it? I tried:

[self myMethod]

^error: Expected Expression before "]" token.

I know this is a simple question, but I am new to iPhone Development

回答1:

The method takes one parameter, so you have to give it one. If you have no sender you want to give, just pass nil:

[self myMethod:nil];

You could also overload the method as a convenience:

// declarations
- (void)myMethod;
- (void)myMethod:(id)sender;

// implementations
- (void)myMethod { [self myMethod:nil]; }
- (void)myMethod:(id)sender { /* do things */ }

回答2:

Unless you wanted to send an unspecified-type object to your method you don't need the (id)sender portion:

- (void)myMethod {

}

回答3:

You need to pass along a sender when you call it.

[self myMethod:something]

In other words, you need to have an argument to pass along when you call the method.

来源：https://stackoverflow.com/questions/4456115/call-idsender-method-in-xcode