Question

在我的应用程序中，我想制作数组，添加到工具栏，然后释放它。然而，当我发布它我的应用程序崩溃。为什么这样...？该怎么做才能省略它？

UIImage *button1Image = [UIImage imageNamed:@"button1Image.png"];
cameraToolbar = [[UIToolbar alloc] init]; //declared in .h
UIBarButtonItem *button1 = [[ UIBarButtonItem alloc ] initWithTitle: @"qwerty" style: UIBarButtonItemStyleBordered target: self action: @selector(doAction)];
[button1 setImage:button1Image];
//same method to add flexItem and button2Image

NSArray *items = [NSArray arrayWithObjects: button1, flexItem, button2, nil];
[cameraToolbar setItems:items animated:NO];
self.view = cameraToolbar;

[items release]; // here it crashes, why? How to fix?
[button1 release];
[button2 release];
[flexItem release];
[button1Image release]; // here i get "Incorrect decrement of the reference count 
//of an object that is not owned at this point by the caller"
[button2Image release];

Answer 1

[NSArray arrayWithObjects：]是一个类方法，它返回一个自动释放对象的数组.so 你不应该释放它。

如果您使用类似alloc，copy，retain创建对象，则只有您有责任释放它们。

NSArray *items=[[NSArray alloc]initWithObjects:button1, flexItem, button2, nil];


............



[items release];

像button1Image object.take care

这样

Answer 2

button1Image被分配了一个自动释放的对象，因此不应发送释放消息。内存管理基于对象引用计数，当计数变为零时，将释放内存。释放消息将引用计数减1。

释放分配给UIBar的NSArray

2 个答案: