將refreshControl添加到TableViewController的子視圖時的EXC_BAD_ACCESS

Question

BrowseViewController加載BrowseResultsTableViewController作爲subView。在這種subview，是下面的代碼塊：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init]; 
    [refreshControl addTarget:self action:@selector(refreshResults:) forControlEvents:UIControlEventValueChanged]; 
    [self.tableView addSubview:refreshControl]; 

} 

- (void)refreshResults:(UIRefreshControl *)sender 
{ 
    NSLog(@"REFRESH"); 
    //[self performSelector:@selector(updateTable) withObject:nil afterDelay:1]; 
} 

引發錯誤​​

如果我清理項目和rebulid，我得到這個錯誤：

2013-03-25 23:59:06.256 rockit[40772:c07] -[UIViewControllerWrapperView refreshResults:]: unrecognized selector sent to instance 0x7516fe0 2013-03-25 23:59:06.257 rockit[40772:c07] - Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewControllerWrapperView refreshResults:]: unrecognized selector sent to instance 0x7516fe0'

爲什麼不能它找到了方法？

Answer 1

我認爲您創建BrowseResultsTableViewController後可能會發布，並且方法結束。您可能需要在引用它的BrowseViewController內創建一個實例變量。

// BrowseViewController.h

@interface BrowseViewController : UIViewController 
// ... 
@property (nonatomic, strong) BrowseResultsTableViewController *browseResultsVC; 
// ... 
@end 

// BrowseViewController.m

@implementation BrowseViewController 
@synthesize browseResultsVC; 
// ... 
- (void)someMethod { 
    self.browseResultsVC = [[BrowseResultsTableViewController alloc] init]; 
    [self.view addSubview:browseResultsVC]; 
} 
// ... 
#end