在Objective-C大括号 [英] Curly Braces in Objective-c

问题描述

注意：我的问题是基于后检查这个和答案吧。

在一些大的方法，也有code片，你只需要为一段时间活着。举个例子：

1）我有设置我的UI大的方法： UILabel的的大小，颜色，位置，的UIView的手势识别器等，了解上述情况，确实是有道理的做这样的事情：

   - （无效）setUI
{
    //设置其他UI元素
    {
        //滑动手势添加到swipeUpView
        UISwipeGestureRecognizer * swipeGestureUp = [[UISwipeGestureRecognizer页头] initWithTarget：自我行动：@selector（animeViewWithSwipeGesture）];        swipeGestureUp.direction = UISwipeGestureRecognizerDirectionUp;
        [_swipeUpView addGestureRecognizer：swipeGestureUp];
    }    //设置其他UI元素
}
 

• 基于上面的例子，这是降低应用程序的内存占用量的有效方法是什么？


• 是否有任何关系 @autoreleasepool {} ？

解决方案

  根据上面的例子

，这是降低应用程序的内存占用量的有效方法是什么？

没有。他们甚至不相关。他们都不是他们与 @autoreleasepool - 花括号的这种用法是打开一个新范围的纯C的方式

Note: My question is based after checking this and the answers to it.

In some bigger methods, there are pieces of code that you only want to be alive for a certain period of time. An example:

1) I have a big method that sets my UI: UILabel's size, colour, positioning, UIView's gesture recognisers, etc. Knowing the above, does it makes sense to do something like this:

- (void)setUI
{
    //setting other UI elements
    {
        // Add the Swipe Gesture to the swipeUpView
        UISwipeGestureRecognizer *swipeGestureUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(animeViewWithSwipeGesture)];

        swipeGestureUp.direction = UISwipeGestureRecognizerDirectionUp;
        [_swipeUpView addGestureRecognizer:swipeGestureUp];
    }

    // setting other UI elements
}

• Based on the above example, is this a valid way of lowering the memory footprint of an application?
• Is there any relation with @autoreleasepool{}?

解决方案

Based on the above example, is this a valid way of lowering the memory footprint of an application?

No. They're not even related. Neither are they related to @autoreleasepool - this usage of curly braces is the plain C way of opening a new scope.

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