iPhone应用如何避免泄露？

Question

我收到崩溃日志：

2011-07-21 23:18:51.233 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fbdef0 of class NSURL autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.233 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x1462e38 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.233 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x1462e38 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.233 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fb32b0 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.235 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fc04e0 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.235 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5f98960 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.235 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fa9c70 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.550 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fbfbb0 of class NSHTTPURLResponse autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.550 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fb5840 of class __NSCFData autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.550 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fb1400 of class __NSArrayM autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.551 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5f83e70 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.551 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fbd480 of class NSCFString autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.551 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fb31b0 of class NSPathStore2 autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.551 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fa9aa0 of class NSPathStore2 autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.551 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fa6110 of class __NSArrayI autoreleased with no pool in place - just leaking
2011-07-21 23:18:51.552 iFeel[87679:910b] *** __NSAutoreleaseNoPool(): Object 0x5fb9700 of class NSCFString autoreleased with no pool in place - just leaking

任何人都可以帮助我避免崩溃吗？

Answer 1

您看到这种情况很可能是因为您在没有自动释放池的线程上执行代码。自动释放池被 Apple 的所有 API 大量使用，因此将一个自动释放池包装在整个线程周围非常重要。一个例子如下：

- (void)myThreadMethod:(id)anObject {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSLog(@"This is some objective-c code...");
    [pool drain];
}

[池排水]部分非常重要。如果没有该代码片段，在线程生命周期内自动释放的所有对象都将被泄漏。

Answer 2

设置 NSAutoreleasePool 的实例。查看 NSAutoreleasePool 类参考了解详细信息和示例。

您可能还想浏览 内存管理编程指南了解为什么设置它很重要以及什么autorelease 确实如此。

我还发现这篇文章的讨论很有帮助： NSAutoreleasePool 自动释放池如何工作？

Answer 3

来自Apple文档链接:

NSAutoreleasePool类用于支持Cocoa的
引用计数内存管理系统。自动释放池存储
当池本身被释放时发送释放消息的对象
耗尽。

重要提示：如果您使用自动引用计数 (ARC)，则无法
直接使用自动释放池。相反，您使用@autoreleasepool
块。例如，代替：

 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
// Code benefitting from a local autorelease pool. 
[pool release];

您可以编写：

 @autoreleasepool {
     // Code benefitting from a local autorelease pool. 
}

@autoreleasepool 块比使用实例更有效
直接使用NSAutoreleasePool；即使您不使用它们也可以使用它们
使用ARC。