2

@autoreleasepool in loop or loop in @autoreleasepool

 1 year ago
source link: https://fann.im/blog/2012/04/22/autoreleasepool-in-loop-or-loop-in-autoreleasepool/
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.

@autoreleasepool in loop or loop in @autoreleasepool

Apr 22, 2012

如果循环中会生成大量的 autorelease 对象，可以考虑用 autorelease pool 来进行封装。封装时候有两种方式：

while ([rs next]) {
    @autoreleasepool {
        NSDictionary *dict = [self dictFromXX];
        //...
    }
}

@autoreleasepool {
    while ([rs next]) {
        NSDictionary *dict = [self dictFromXX];
        //...
    }
}

第一种，也就是 @autoreleasepool in loop 方式下每次循环都会生成一个 pool，在单次循环结束后被 drain 掉，适用于每次循环都有大量的 autorelease 对象生成，在单次循环结束后可以及时的将资源释放。

第二种，loop in @autoreleasepool 下只有一个 pool，只会在整个循环结束后 drain 掉，也就是说第一次循环时生成的 autorelease 对象也要等到整个循环结束时候才会随着 pool 释放。适用于循环次数不太多，且每次循环只有少量的 autorelease 对象生成，毕竟这些对象都要等到循环结束后才会被释放。

ref @autoreleasepool in loop or loop in @autoreleasepool?

Was this page helpful?


report

Recommend

About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK