从uislider实现valueChanged操作时出现无法识别的选择器错误

我有一个非常简单的子类 UIViewController :

@interface RoastChickenViewController : UIViewController {
    IBOutlet UISlider *weightSlider;    
}

@property (nonatomic,retain) UILabel *cookingTimeLabel;
- (void) weightValueHasChanged:(id)sender;
@end

我的XIB文件设置为 RoastChickenViewController 因为它是文件的所有者类型和 weightSlider 已连接并且“valueChanged”操作已连接到 weightValuHasChanged: .

问题是我一接触滑块(模拟器或设备),就会得到:

2010-08-21 20:26:07.688 CookIt1[26682:207] -[NSCFString weightValueHasChanged:]: unrecognized selector sent to instance 0x59215e0
2010-08-21 20:26:07.690 CookIt1[26682:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString weightValueHasChanged:]: unrecognized selector sent to instance 0x59215e0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x02395919 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x024e35de objc_exception_throw + 47
    2   CoreFoundation                      0x0239742b -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x02307116 ___forwarding___ + 966
    4   CoreFoundation                      0x02306cd2 _CF_forwarding_prep_0 + 50
    5   UIKit                               0x002b9e14 -[UIApplication sendAction:to:from:forEvent:] + 119
    6   UIKit                               0x003436c8 -[UIControl sendAction:to:forEvent:] + 67
    7   UIKit                               0x00345b4a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    8   UIKit                               0x003c23ac -[UISlider beginTrackingWithTouch:withEvent:] + 731

有点历史,实际上我是用直接子类化的uiview工作的。我成功地将它从一个uiview转换成一个uiviewcontroller,这是实现这种简单行为的更自然的方法。

我是否可以申请一些检查表,因为我明显遗漏了一些东西。