Outlet 没有出现在 Interface Builder (Xcode 3) 和 Xcode4 中

Question

我正在学习开发 iOS 应用程序（我是 Objective-C 和 Cocoa 的新手），我正在做这个非常简单的示例练习（两个按钮显示左或右按钮在标签中被按下）。

我只是创建了一个 IBOutlet 和几行代码，保存了两个 AppViewController 文件，当尝试将 IBOutlet 与 Interface Builder 中的实际标签连接时，插座没有出现。

我使用的是 iOS SDK 4.3

这里是源代码：

//
//  BotonViewController.h
//  Boton
//
//  Created by Abu on 5/23/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface Hola_MundoViewController : UIViewController {

IBOutlet UILabel *statusText; 

}

@property (retain, nonatomic) UILabel *statusText;

-(IBAction)buttonPressed: (id)sender;

@end

和

//
//  BotonViewController.m
//  Boton
//
//  Created by Abu on 5/23/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "BotonViewController.h"

@implementation Hola_MundoViewController
@synthesize statusText;

-(IBAction)buttonPressed: (id)sender
{
NSString *title = [sender titleForState:UIControlStateNormal];
NSString *newText = [[NSString alloc] initWithFormat:
                     @"%@ button pressed.", title];
statusText.text = newText;
[newText release];
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:         (UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}


- (void)dealloc {
[statusText release];
    [super dealloc];
}

@end

嗯，就是这样，希望你能帮我解决这个问题，可能是一个愚蠢的错误，但我浏览了很多，我找不到解决方案。

Answer 1

您的属性声明应如下所示

@property (retain, nonatomic) IBOutlet UILabel *statusText;