Question

我无法弄清楚我在NSMustableArray上做错了什么。可以公平地说，我并不太了解内存分配，所以如果这是一个简单的问题我会道歉。

我有一个标签栏应用程序运行良好，在其中一个标签栏上我有一个人的前视图和后视图。

在.h我有

@interface BurnsCalculatorViewController : UIViewController// <UIPickerViewDelegate, UIPickerViewDataSource>
{
    UIView              *frontView;
    UIView              *backView;
    UIButton            *frontButton;
    UIButton            *backButton;
    NSMutableArray      *frontBurnsArray;
}

@property (nonatomic, retain) UIView            *frontView;
@property (nonatomic, retain) UIView            *backView;
@property (nonatomic, retain) UIButton          *frontButton;
@property (nonatomic, retain) UIButton          *backButton;
@property (nonatomic, retain) NSMutableArray    *frontBurnsArray;

-(IBAction)frontButtonSelect:(id)sender;
-(IBAction)backButtonSelect:(id)sender;

@end

然后我有.m文件

@implementation BurnsCalculatorViewController

@synthesize frontView;
@synthesize backView;
@synthesize frontButton;
@synthesize backButton;
@synthesize frontBurnsArray;

-(IBAction)frontButtonSelect:(id)sender
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:1.0];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:[self view] cache:YES];
    [self.view addSubview:backView];
    [self.view addSubview:backButton];
[UIView commitAnimations];
    NSLog(@"%@", frontBurnsArray);
}

-(IBAction)backButtonSelect:(id)sender
{
    [UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:[self view] cache:YES];
    [self.view addSubview:frontView];
    [self.view addSubview:frontButton];
[UIView commitAnimations];
    NSLog(@"%@", frontBurnsArray);
}

-(void)viewDidLoad
{
    frontBurnsArray = [NSMutableArray arrayWithObjects: @"frontHead", @"frontChest", @"frontAbdomen", @"frontGroin",@"frontLeftArm", @"frontLeftForeArm", @"frontRightArm", @"frontRightForearm", @"frontLeftThigh", @"frontLeftLowerLeg", @"frontRightThigh", @"frontRightLowerLeg",nil];

    CGRect viewframe = CGRectMake(0, 0, 320, 480);
    frontView = [[UIView alloc] initWithFrame:viewframe];
    frontView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:frontView];

    frontButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [frontButton addTarget:self action:@selector(frontButtonSelect:) forControlEvents:UIControlEventTouchDown];
    [frontButton setTitle:@"Show Back" forState:UIControlStateNormal];
    frontButton.frame = CGRectMake(210, 10, 100, 30);
    [self.view addSubview:frontButton];

    backView = [[UIView alloc] initWithFrame:viewframe];
    backView.backgroundColor = [UIColor blackColor];
    backButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
    [backButton addTarget:self action:@selector(backButtonSelect:)forControlEvents:UIControlEventTouchDown];
    [backButton setTitle:@"Show Front" forState:UIControlStateNormal];
    backButton.frame = CGRectMake(210, 10, 100, 30);
}

-(void)dealloc
{
    [super dealloc];
    [frontButton release];
    [backButton release];
    [frontBurnsArray release];
}
@end

我无法弄清楚为什么IBActions中的NSLog都告诉我实例已被解除分配。除了dealloc中的“释放”之外，我已经说要保留阵列并且没有在其他地方发布它。

我花了很长时间寻找答案，但是无法理解。

谢谢！

Answer 1

frontBurnsArray = [NSMutableArray arrayWithObjects: @"frontHead", @"frontChest", @"frontAbdomen", @"frontGroin",@"frontLeftArm", @"frontLeftForeArm", @"frontRightArm", @"frontRightForearm", @"frontLeftThigh", @"frontLeftLowerLeg", @"frontRightThigh", @"frontRightLowerLeg",nil];

您没有使用保留属性

试

self.frontBurnsArray = [NSMutableArray arrayWithObjects: @"frontHead", 
                                                         @"frontChest",
                                                         @"frontAbdomen", 
                                                         //....
                                                         nil];

您正在创建一个自动重新排序的数组，这意味着它将在下一个运行循环中消失。如果将其分配给属性，它将自动保留并将一直存在，直到您将其释放。你也可以打电话

frontBurnsArray = [[NSMutableArray arrayWithObjects: @"frontHead", 
                                                         @"frontChest",
                                                         @"frontAbdomen", 
                                                         //....
                                                         nil] retain];

取消分配NSMutableArray？

1 个答案: