Cocoa touch 选择器中的第二个组件未正确实例化

我正在使用picker处理简单实用程序应用程序，但消息输出不正确。第二个组件没有正确实例化，而是输出“我在睡觉，感觉很开心。”之类的内容，而输出“我在睡觉，感觉InstatwitViewController很开心”

一切都已在IB中连接

你能告诉我怎么了吗

以下是.h文件：

#import <UIKit/UIKit.h>

@interface InstatwitViewController : UIViewController
<UIPickerViewDataSource, UIPickerViewDelegate>
{
    IBOutlet UIPickerView *tweetPicker;
    NSArray* activities;
    NSArray* feelings;
}

@property (nonatomic,retain)UIPickerView* tweetPicker; 
- (IBAction) sendButtonTapped:(id)sender;

@end

---

如果我们修复缩进，您的

sendbuttonattaped:

如下所示：

- (IBAction) sendButtonTapped:(id)sender
{
    NSString* themessage = [NSString stringWithFormat:@"I'm %@ and feeling %@ about it.",
                            [activities objectAtIndex:[tweetPicker selectedRowInComponent:0]]];
    [feelings objectAtIndex:[tweetPicker selectedRowInComponent:1]];
    NSLog(themessage);
}

换句话说，括号嵌套错误，永远不会将“感觉”传递给格式字符串。你很幸运，它没有撞到你

- (IBAction) sendButtonTapped:(id)sender
{
    NSString* themessage = [NSString stringWithFormat:@"I'm %@ and feeling %@ about it.",
                            [activities objectAtIndex:[tweetPicker selectedRowInComponent:0]]];
    [feelings objectAtIndex:[tweetPicker selectedRowInComponent:1]];
    NSLog(themessage);
}