Question

我在视图中遇到条形按钮项目时遇到了问题。我有一个子视图，被添加到超级视图，当我点击barbuttonitem它崩溃的应用程序，我得到这个错误

*** -[DetailViewController performSelector:withObject:withObject:]: message sent to deallocated instance 0x27677fa0


- (void)viewDidLoad
{
    [super viewDidLoad];
    navBar.tintColor = [UIColor blackColor];
    UIColor *topGreen = [UIColor colorWithRed:246/255.f green:241/255.f blue:206/255.f alpha:1];
    UIColor *bottomGreen = [UIColor colorWithRed:242/255.f green:237/255.f blue:204/255.f alpha:1];
    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = self.view.bounds;
    gradient.colors = [NSArray arrayWithObjects:(id)topGreen.CGColor, (id)bottomGreen.CGColor, nil];
    [self.view.layer insertSublayer:gradient atIndex:0];
    backButton = [[UIBarButtonItem alloc] initWithTitle:@"Map" style:UIBarButtonSystemItemAction target:self action:@selector(returnToMap:)];
    UINavigationItem *navButton = [[UINavigationItem alloc]init];
    navButton.leftBarButtonItem = backButton;
    [navBar pushNavigationItem:navButton animated:YES];
    navBar.topItem.title = title;
    NSLog(@"Reached");
    //[self returnToMap];
    //Do any additional setup after loading the view from its nib.
}

我不知道如何解决这个问题。我已经尝试添加barbutton作为属性并合成它但似乎没有任何效果。任何帮助都会很棒

Answer 1

问题不在UIBarButtonItem，而在DetailViewController实例中 - 您过早发布，或者没有保留参考。

BarButtonItem崩溃ios应用程序

1 个答案: