NSMutableArray initWithContentsOfFile内存泄漏

Question

我是iPhone开发的新手,我有这个内存泄漏.

我使用NSMutableArray来检索位于Documents目录中的.plist文件的内容.

我第一次使用它,一切都很顺利,但如果我多次调用它,我会得到内存泄漏.

这是我的代码:

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  NSArray *paths = NSSearchPathForDirectoriesInDomains
                       (NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths objectAtIndex:0];
     //make a file name to write the data to using the
     //documents directory:
  fullFileName = [NSString stringWithFormat:@"%@/SavedArray", documentsDirectory];
     //retrieve your array by using initWithContentsOfFile while passing
     //the name of the file where you saved the array contents.
  savedArray = nil;
  savedArray = [[NSMutableArray alloc] initWithContentsOfFile:fullFileName];
  self.composedArray = [savedArray copy];
  [savedArray release];
  [self.tableView reloadData];
}

每次视图消失时我都会释放它

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  [composedArray release];
  composedArray = nil;
  [savedArray release];
}

我正在使用Instruments,这告诉我内存泄漏源是这行代码:

savedArray = [[NSMutableArray alloc] initWithContentsOfFile:fullFileName];

我不知道如何解决这个漏洞,如果有人可以分享任何解决方案,我会非常感激.

提前致谢.

Answer 1

财产的声明如何composedArray？

如果声明是:

@property(retain) id composedArray;

这就是内存泄漏的地方.copy增加引用计数,同样如此retain.如果您分配给composedArray您的任何时候将分配一份副本(通过阅读您的代码),您应该将您的财产声明为:

@property(copy) id composedArray;

然后更改您的代码:

self.composedArray = savedArray;

(副本将在synthethised访问器中发生).