找不到類型爲'segmentControl'的對象的屬性iphone

Question

我已經定義了segmentControl按鈕。

@property(nonatomic, strong) SegmentControl *option; 
SegmentControl *result = [[SegmentControl alloc] initWithFrame:frame items:@[@"Bad", @"Good"]]; 


result:self.option.selectedSegmentIndex 

爲什麼我收到此錯誤：屬性 'selectedSegmentIndex' 上鍵入 'segmentControl' 的對象沒有找到，

@class SegmentControl; 
@protocol SegmentControlDelegate <NSObject> 
@optional 
- (void)segmentControl:(SegmentControl *)segmentControl didSelectSegment:(UIButton *)segment; 

@end 

@interface SegmentControl : UIView 

@property(nonatomic, assign) BOOL staySelected; 
@property(nonatomic, weak) id<SegmentControlDelegate> delegate; 

- (id)initWithFrame:(CGRect)frame items:(NSArray *)items; 

@end 

Answer 1

你的類SegmentControl必須UISegmentControl（沒有的UIView）的子類。