objective-c - Objective-C : How to release delegates in this situation

Question

我正在使用自定义委托(delegate)对象在请求完成后执行一些清理任务。 ASIHTTPRequest 不保留委托(delegate)，所以我不能自动释放它们。现在这就是我分配和释放委托(delegate)的方式。

应用委托(delegate)

MyDelegate *delegate = [[MyDelegate alloc] init];   
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:delegate];

我的委托(delegate).m

- (void)requestFinished:(ASIHTTPRequest *)request
{
    [self release];
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
    [self release];
}

有更好的方法吗？让委托(delegate)释放自己看起来很丑陋，Xcode 的构建和分析对我正在做的事情感到不舒服。

Answer 1

一种简单的方法是为主 Controller 中的每个事件请求维护一组可变委托(delegate)(在本例中为应用程序委托(delegate)):

@interface MyAppController
{
    NSMutableSet * activeDelegates;
}
@end

@implementation MyAppController

- (id)init
{
    if ((self = [super init]) == nil) { return nil; }
    activeDelegates = [[NSMutableSet alloc] initWithCapacity:0];
    return self;
}

- (void)dealloc
{
    [activeDelegates release];
}

- (void)createRequest
{
    MyDelegate *delegate = [[MyDelegate alloc] init];
    [activeDelegates addObject:delegate];
    [delegate release];

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDelegate:self];

    ...
}

- (void)requestFinished:(ASIHTTPRequest *)request
{
    MyDelegate *delegate = [request delegate];
    [delegate doSomething];
    [activeDelegates removeObject:delegate];
{

- (void)requestFailed:(ASIHTTPRequest *)request
{
    [activeDelegates removeObject:[request delegate]];
}

@end