iphone - Strange Xcode warning -

I have in my picker class:

  - (ID) initWithFrame: (CGRect) Sender with frame: Date with sender: (NSDate *) Date {if ((self = [super initWithFrame: frame])) {datePicker = [[UIDatePicker alloc] initWithFrame: CGRectMake (0, 0, 0, 0)]; DatePicker.date = date; [Change date of sender: selfetic picture]; DatePicker.date = date; }  

and in the sender category:

  - (zero) changeDate: (id) sender {// some code}   
 Both methods are also declared in .h files. 
 
 But when I compile, even if everything is working properly, xcode tells me: 
 
 
 No - change date: 'method found < / P> 
 
 The line  [sender changes date: self.datePicker] is referring to  
 
 What can I do to make it disappear? Thanks! 
 

Because your sender type is id, and there is no method for type id (change date :) Therefore, if you want to call the changeDate: method, you must enter your sender, or you must specify the specific class type.

(MySender *) MySender = (MySender *) Sender;

  - (id) initWithFrame: (CGRect) Frame with Frame: (MySender *) Sender withDate :( NSDT *) Date {< / Code>