iphone - 什么时候触发自动释放池

Question

我在整个应用程序中都使用了自动释放，并且想了解自动释放方法的行为。默认的自动释放池什么时候被耗尽？它是基于计时器(每 30 秒一次？)还是必须手动调用？我需要做些什么来释放带有自动释放标记的变量吗？

Answer 1

创建和发布时有(我会说)3 个主要实例:

1.应用程序生命周期的开始和结束，在 main.m 中编写

int main(int argc, char *argv[]) { 
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
    int retVal = UIApplicationMain(argc, argv, nil, nil); 
    [pool release]; 
    return retVal; 
}

2.每个事件的开始和结束(在 AppKit 中完成)

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
- (void)loadView 
/* etc etc initialization stuff... */
[pool release];

3.Whenever you want (你可以创建你自己的池并释放它。[来自苹果内存管理文档])

– (id)findMatchingObject:anObject { 
    id match = nil; 
    while (match == nil) { 
        NSAutoreleasePool *subPool = [[NSAutoreleasePool alloc] init]; 
        /* Do a search that creates a lot of temporary objects. */ 
        match = [self expensiveSearchForObject:anObject]; 
        if (match != nil) { 
            [match retain]; /* Keep match around. */ 
        } 
        [subPool release]; 
    } 
    return [match autorelease];   /* Let match go and return it. */
}