爲什麼UIScrollViewDelegate不起作用？

Question

我有一個名爲「HaveScrollController」的viewController，這是這樣的：

@interface HaveScrollController : UIViewController <UIScrollViewDelegate>{ 
    IBOutlet UIScrollView *scrollView; 
    IBOutlet UIView *firstView; 
    IBOutlet UIView *secondView; 
    IBOutlet UIView *thridView; 
    IBOutlet UIView *fourthView; 
} 


@property (retain, nonatomic) UIScrollView *scrollView; 
@property (retain, nonatomic) UIView *firstView; 
@property (retain, nonatomic) UIView *secondView; 
@property (retain, nonatomic) UIView *thridView; 
@property (retain, nonatomic) UIView *fourthView; 


@end 

與.m是這樣的：

@synthesize scrollView,firstView,secondView,thridView,fourthView; 
- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [self.view addSubview:scrollView]; 

    scrollView.delegate = self; 
} 


- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ 
    NSLog(@"scroll detected"); 
} 

@end 

我做出了IB所有的連接已經。我想利用這個控制器在我的「TestAppController」，它是這樣的，它不使用IB，並生成界面使用代碼：

@interface TestAppController : UIViewController <UIScrollViewDelegate,UIActionSheetDelegate, UITextFieldDelegate> { 
    HaveScrollController *scollViewController; 
} 

的.M是在的loadView這樣的事情方法：

scollViewController = [[HaveScrollController alloc] initWithNibName:@"HaveScrollView" bundle:nil]; 

[mainCanvas addSubview: buttomScollViewController.view]; 
self.view = mainCanvas; 
[mainCanvas release]; 

當我嘗試滾動視圖，但「滾動檢測」未顯示。我做錯了什麼？謝謝。

Answer 1

是否滾動到scrollView？它看起來像你忘了設置contentSize：

scrollView.contentSize = CGSizeMake(320, 400); 

顯然，確保contentSize大於scrollView's框架，使滾動操作踢