不能在按下其他按鈕之後改變圖片的按鈕

Question

我有2個按鈕與按下的圖片保持一致，即使它們被釋放，直到按下另一個按鈕，然後圖像返回到正常圖像我的代碼是這樣的：

- (IBAction)button1_touch:(UIButton *)sender 
{ 

    [Button2 setImage:[UIImage imageNamed:@"b2Released.png"] forState:UIControlStateNormal]; 

    [Button1 setImage:[UIImage imageNamed:@"b1Pressed.png"] forState:UIControlStateNormal];  
} 

- (IBAction)button2_touch:(UIButton *)sender 
{ 
    [Button1 setImage:[UIImage imageNamed:@"b1Released.png"] forState:UIControlStateNormal]; 

    [Button2 setImage:[UIImage imageNamed:@"b2Pressed.png"] forState:UIControlStateNormal]; 


} 

應用程序啓動時，上面的代碼工作正常，是預期的行爲按兩個按鈕，圖像正確地更改，但是當我按下另一個按鈕，除了這兩項，則「將Button2」一旦獲得了「B2Pressed .png「圖像，它永遠不會返回到它發佈的圖像，我在button1_touch中寫了一個nslog，並且按預期打印了它，並且Button1獲取了它的壓縮圖像，但Button2沒有獲取其發佈的圖像，就像setImage UiButton被破壞ñ我按其他按鈕比這兩個，其他按鈕是獨立於這兩個，對我來說，這種行爲是完全沒有意義的，它可能是xcode破碎？我工作的xcode 7.2

編輯： 當我按另一個按鈕時，只有當該按鈕有一個動作選擇器分配給它（UIControlEventTouchUpInside）時發生問題。

Answer 1

可以使用的UIButton的selected狀態爲此目的：

- (void)viewDidLoad { 
    // ... 
    // the place where you do buttons setup 
    [button1 setImage:[UIImage imageNamed:@"b1Released"] forState:UIControlStateNormal]; 
    [button1 setImage:[UIImage imageNamed:@"b1Pressed"] forState:UIControlStateSelected]; 
    [button2 setImage:[UIImage imageNamed:@"b2Released"] forState:UIControlStateNormal]; 
    [button2 setImage:[UIImage imageNamed:@"b2Pressed"] forState:UIControlStateSelected]; 
}  

- (IBAction)firstButtonTouch:(UIButton *)sender { 
    button1.selected = YES; 
    button2.selected = NO; 
} 

- (IBAction)secondButtonTouch:(UIButton *)sender { 
    button1.selected = NO; 
    button2.selected = YES; 
}