属性访问结果未使用

Question

I just started learning Objective-C yesterday, and i can't quite figure out this warning:

Property access result unused - getters should not be used for side effects

Using this code (line 3 gives the warning, self.addItem()):

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if (textField == self.itemTxt) {
        self.addItem;
        self.itemTxt.text = @"";
    }
    return YES;
}

- (IBAction)addItem {
    [self.model addItemToArray: _itemTxt.text];
    _itemTxt.text = @"";
}

Why am I getting this warning?

Answer 1

What is addItem. According to your code, it seems you're trying to call that function so use this:

[self addItem];

One more thing basically, if you see in depth about IBAction, you'll find it's void. Normally, we use IBAction when we want to use IB for event fire.

So, you can use(if you need to call manually)

- (void)addItem {
    [self.model addItemToArray: _itemTxt.text];
    _itemTxt.text = @"";
}

Hope, it'll enhance your knowledge and will assist in your warning.

Answer 2

To call the function use

[self addItem];

When you're using self.addItem you're accessing a variable named addItem.