Question

Observe this code:

- (void)hideRectangleWithAnimation:(BOOL)animate completion:(void (^)(void))completionBlock
{
    if (animate)
    {
        // Hide rectangle
        [UIView animateWithDuration:0.3 animations:^{ rect.alpha = 0; } completion:^(BOOL finished){
            completionBlock();
        }
    }
    else
    {
        rect.alpha = 0;
    }
}

Is there a way to not repeat the property change: rect.alpha = 0; twice?

This line of code is currently trivial but there could be a more complex case where multiple stuff are happening.

Answer 1

I think I just found the answer. I can put rect.alpha = 0; in a block variable and use that instead.

void (^animationBlock)(void) = ^{
    rect.alpha = 0;
};

if (animate)
{
    [UIView animateWithDuration:0.3 animations:animationBlock completion:^(BOOL finished){
        completionBlock();
    }];
}
else
{
    animationBlock();
}