編程一個UIButton作爲切換

Question

這是我正在做我的UIButton管理收藏夾：

-(IBAction)favoriteButtonPressed:(id)sender 
    { 
    if (favoriteButtonSelected == 0) { 

     [sender setSelected:YES]; 

     favoriteButtonSelected = 1; 
     [sender setImage:[UIImage imageNamed:@"favoritedItem.png"]]; 
     [selectedObject setValue:@"Yes" forKey:@"Favorite"]; 

    } else { 

     [sender setSelected:NO]; 

     favoriteButtonSelected = 0; 
     [sender setImage:[UIImage imageNamed:@"notFavorite.png"]]; 
     [selectedObject setValue:@"No" forKey:@"Favorite"]; 
    } 
} 

而這個設置默認狀態按鈕：

- (void)viewDidLoad 
    { 
    [super viewDidLoad]; 

    if ([[selectedObject valueForKey:@"Favorite"] isEqual:@"Yes"]) { 

     [favoriteButton setImage:[UIImage imageNamed:@"favoritedItem.png"]]; 
     [favoriteButton setSelected:YES]; 
     favoriteButtonSelected = 1; 

    } else { 

     [favoriteButton setImage:[UIImage imageNamed:@"notFavorite.png"]]; 
     [favoriteButton setSelected:NO]; 
     favoriteButtonSelected = 0; 
    } 
    } 

而且我的問題是：如何聲明favoriteButtonSelected？以及如何使viewDidLoad中的按鈕（favoriteButton）和favoriteButtonSelected的引用？

Answer 1

我開發了一個UICheckbox解決方案，它本質上只是一種切換。您可以輕鬆地更換我的開源項目提供的圖像，並有你在找什麼：

https://github.com/Brayden/UICheckbox