xcode IBOutlet UITableView 在 View 加载后为 null
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原文地址: http://stackoverflow.com/questions/6724461/
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IBOutlet UITableView is null after View did load
提问by Rene Koller
Here's the basic code (based on Xcode's Tabbed Applicaion Template)
这是基本代码（基于 Xcode 的选项卡式应用程序模板）
ViewController.h
视图控制器.h
@interface ViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic,retain) NSMutableArray *movies;
@property (nonatomic,retain) IBOutlet UITableView *tableView;
ViewController.m
视图控制器.m
@implementation ViewController
@synthesize movies,tableView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(@"Watchlist", @"Watchlist");
self.tabBarItem.image = [UIImage imageNamed:@"watchlist"];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"tableView = %@", tableView);
}
Output
输出
tableView = (null)
The TableView is connected to File's owner in IB with class is set to ViewController
TableView 连接到 IB 中的文件所有者，类设置为 ViewController
I really don't get why the tableView is null. I'm not a complete newbie to Cocoa (but to the iPhone SDK), I created a Single View based Application with a TableView dataSource to see if I was missing something. I got it working in under a minute.
我真的不明白为什么 tableView 为空。我不是 Cocoa 的完全新手（而是 iPhone SDK），我使用 TableView 数据源创建了一个基于单视图的应用程序，看看我是否遗漏了什么。不到一分钟我就搞定了。
Anybody can help out?
有人可以帮忙吗？
回答by Paul.s
In interface builder right click File's Ownerand ensure that the following connections are made:
在界面生成器中右键单击File's Owner并确保进行以下连接：
Outlets
tableView - Table View
Referencing Outlets
dateSource - Table View
delegate - Table View
I suspect you may have not made the first connection?
我怀疑你可能没有建立第一次连接？
回答by auco
Make sure the nib/xib is included in your current target.
确保 nib/xib 包含在您当前的目标中。
I just experienced this issue on Xcode5 with iOS7 SDK. Strangely enough, I discovered that the nib wasn't included in my target anymore. I don't know when and why that happened, but it had this strange side effect that most IBOutlets weren't set up properly, even if all connections from code to nib/xib were fine.
我刚刚在带有 iOS7 SDK 的 Xcode5 上遇到了这个问题。奇怪的是，我发现笔尖不再包含在我的目标中。我不知道发生这种情况的时间和原因，但它有一个奇怪的副作用，即大多数 IBOutlets 没有正确设置，即使从代码到 nib/xib 的所有连接都很好。
For example: my MKMapView *mapwas in my list of subviews on viewDidLoad:, but the IBOutlet MKMapView *mapproperty in my view controller was still nil. After I ticked the "include in target" checkbox, everything worked as expected.
例如： myMKMapView *map在我的子视图列表中viewDidLoad:，但IBOutlet MKMapView *map我的视图控制器中的属性仍然是nil。在我勾选“包含在目标中”复选框后，一切都按预期工作。
