如何在 XCode 中使用 Product > Analyze 释放对象？

Question

看到下面的代码，它只是一个方法，我无法理解其中的内存管理问题，请告诉我，下面的代码发生了什么，为什么？

-(IBAction)selectMarina {
NSLog(@"Select Marina");
actionSheet = [[UIActionSheet alloc] initWithTitle:nil 
                                          delegate:nil
                                 cancelButtonTitle:nil
                            destructiveButtonTitle:nil
                                 otherButtonTitles:nil];

[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];    
CGRect pickerFrame = CGRectMake(0, 40, 0, 0);
pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
pickerView.showsSelectionIndicator = YES;
pickerView.dataSource = self;
pickerView.delegate = self;

[actionSheet addSubview:pickerView];
//[pickerView release];

UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Close"]];
closeButton.momentary = YES; 
closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
closeButton.tintColor = [UIColor blackColor];
[closeButton addTarget:self action:@selector(dismissActionSheet:) forControlEvents:UIControlEventValueChanged];
[actionSheet addSubview:closeButton];
//[closeButton release];

[actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];
[actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
[pickerView selectRow:0 inComponent:0 animated:NO];

}

这里是Potential leak of object allocated on line 112 and stored into close button

它正在在线显示这样的消息

    [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];

如何在这段代码中进行适当的内存管理，您能否详细指定它

谢谢

Answer 1

首先你需要释放实例pickerView和closeButton。

根据规则，每当你分配一个对象时，一旦它的工作完成就必须释放它。在您的情况下，不需要将两个实例都添加到子视图后，因此必须释放它们。否则它将显示您提到的泄漏。

如需了解更多信息，请参阅内存指南或快速查看点击http://www.raywenderlich.com/2657/memory-management-in-objective-c-tutorial