Code for Blog Post: http://iconoclastlabs.com/cms/blog/posts/starting-with-rubymotion-delegates-and-messages

example1.m

[string drawAtPoint:point withFont:font];

example1.rb

string.drawAtPoint(point, withFont:font)

example2.m

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
     ...
}

example2.rb

def numberOfComponentsInPickerView pickerView
     ...
end

example3.m

- (NSInteger) pickerView:(UIPickerView *)pickerView- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
     ...
}

example3.rb

def pickerView(pickerView, titleForRow:row, forComponent:component)
     ...
end

example4.m

NSString *wholeText = [textField.text stringByReplacingCharactersInRange:range withString:string];

example4.rb

wholeText = textField.text.stringByReplacingCharactersInRange(range, withString:string)