多视图应用程序的问题

Question

您好，我制作了一个应用程序，它有 2 个视图，一个分页滚动视图的高度为 430 像素，另一个静态视图的高度为 50 像素。我的问题有点难以理解，我在静态视图中有信息按钮，如果我单击它，程序会由于以下原因而失败：

sharedlibrary apply-load-rules all kill Current language:  auto; currently objective-c quit Program ended with exit code: 0 

或者

2011-03-30 08:51:28.427 PhotoScroller[637:207] -[__NSCFType buttonPressed1]: unrecognized selector sent to instance 0x4b36db0
2011-03-30 08:51:28.456 PhotoScroller[637:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType buttonPressed1]: unrecognized selector sent to instance 0x4b36db0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00f2f5a9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x01083313 objc_exception_throw + 44
    2   CoreFoundation                      0x00f310bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x00ea0966 ___forwarding___ + 966
    4   CoreFoundation                      0x00ea0522 _CF_forwarding_prep_0 + 50
    5   UIKit                               0x002bc4fd -[UIApplication sendAction:to:from:forEvent:] + 119
    6   UIKit                               0x0034c799 -[UIControl sendAction:to:forEvent:] + 67
    7   UIKit                               0x0034ec2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    8   UIKit                               0x0034d7d8 -[UIControl touchesEnded:withEvent:] + 458
    9   UIKit                               0x002e0ded -[UIWindow _sendTouchesForEvent:] + 567
    10  UIKit                               0x002c1c37 -[UIApplication sendEvent:] + 447
    11  UIKit                               0x002c6f2e _UIApplicationHandleEvent + 7576
    12  GraphicsServices                    0x01887992 PurpleEventCallback + 1550
    13  CoreFoundation                      0x00f10944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
    14  CoreFoundation                      0x00e70cf7 __CFRunLoopDoSource1 + 215
    15  CoreFoundation                      0x00e6df83 __CFRunLoopRun + 979
    16  CoreFoundation                      0x00e6d840 CFRunLoopRunSpecific + 208
    17  CoreFoundation                      0x00e6d761 CFRunLoopRunInMode + 97
    18  GraphicsServices                    0x018861c4 GSEventRunModal + 217
    19  GraphicsServices                    0x01886289 GSEventRun + 115
    20  UIKit                               0x002cac93 UIApplicationMain + 1160
    21  PhotoScroller                       0x00001c20 main + 102
    22  PhotoScroller                       0x00001bb1 start + 53
    23  ???                                 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'

但如果我在分页滚动视图中使用相同的代码，它可以完美地

作为我的代码的一部分：

UIButton *iButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
iButton.frame = CGRectMake(269.0f, 17.0f, 18.0f, 19.0f);
iButton.backgroundColor = [UIColor clearColor];
[iButton addTarget:self action:@selector(buttonPressed) 
forControlEvents:UIControlEventTouchUpInside];    
[self.view addSubview:iButton];

-(void)buttonPressed{
    NSLog(@"button pressed in PSV...");
}

我不明白它，我希望它能起作用。我只是想理解为什么它不起作用。

静态视图是 ViewController 的子类 分页滚动视图是 UIScrollView 的子类，

感谢您的所有答案。

Answer 1

您为按钮操作指定的选择器应采用 id 类型的单个参数。因此，尝试将选择器规范更改为 @selector(buttonPressed:) 并将操作方法​​更改为：

- (void)buttonPressed:(id)sender { ... }