Release NSArray分配給UIBar

Question

在我的應用程序中，我想創建數組，添加到工具欄然後釋放它。但是，當我釋放它我的應用程序崩潰。爲什麼這樣...？怎麼做才能省略它？

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的arrayWithObjects：]是一類方法它返回一個陣列，其是自動釋放對象。所以ùshouldnot釋放它。

如果你使用類似alloc創建對象，複製，保留，那麼只有你有責任釋放它們。

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


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



[items release]; 

像這樣button1Image object.take關心

Answer 2

button1Image分配被自動釋放，並因此不應當被髮送釋放消息一個對象。內存管理基於對象引用計數，當計數變爲零時，內存將被釋放。釋放消息將引用計數減1。