Multiple unknown parameters in IOS

Multiple unknown parameters in IOS

-(Void) setGradientColor :( UIColor *) beginColor transitionColor :( UIColor *) transitionColor,... NS_REQUIRES_NIL_TERMINATION;

 

// NS_REQUIRES_NIL_TERMINATION, used for non-nil end check during compilation

-(Void) setGradientColor :( UIColor *) beginColor transitionColor :( UIColor *) transitionColor ,...{

[Self. gradientColors addObject :( id) beginColor. CGColor];

// Define a pointer to the list of optional parameters

Va_list args;

 

// Obtain the address of the first optional parameter. The parameter list Pointer Points to the first optional parameter in the function parameter list.

Va_start (args, transitionColor );

 

If (transitionColor)

{

[Self. gradientColors addObject :( id) transitionColor. CGColor];

 

// Traverse the parameters in the parameter list and point the parameter list pointer to the next parameter in the parameter list

UIColor * nextArg;

While (nextArg = va_arg (args, UIColor *)))

{

[Self. gradientColors addObject :( id) nextArg. CGColor];

}

}

// End variable parameter acquisition (clear the parameter list)

Va_end (args );

}

 

[DrawCircleView setGradientColor: [UIColor purpleColor] transitionColor: [UIColor redColor], [UIColor blueColor], nil];