rightbarbuttonitems中的額外按鈕沒有顯示

Question

我在下面的代碼中創建了兩個UIBarButtonItem。稍後，我將它們添加到rightBarButtonItems，但只有其中一個按鈕出現（我首先放在列表中的那個按鈕）。 我認爲也許標題的視圖（沒有設置）將位於右邊的BarButtonItems前面，因爲Apple文檔顯示「如果沒有足夠的空間來顯示數組中的所有項目，那些項目會重疊標題視圖（如果存在）或者欄左側的按鈕不顯示「 但是，由於視圖的框架= {0,0} {0,0}

我無法弄清楚我做錯了什麼。任何人都可以告訴我如何讓所有正確的BarButtonItems顯示？代碼：

UIBarButtonItem *shareButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(shareAction:)]; 

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
[button setFrame:CGRectMake(0, 0, 30, 30)]; 
[button setBackgroundImage:[UIImage imageNamed:@"custom-bar-button.png"] forState:UIControlStateNormal]; 
[button addTarget:self action:@selector(barButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; 

UIBarButtonItem *wishlistButton = [[UIBarButtonItem alloc] initWithCustomView:button]; 

[self.navigationItem setRightBarButtonItems:[[NSArray alloc] initWithObjects:shareButton, wishlistButton, nil]]; 

Answer 1

使用UIBarButtonItem：

UIBarButtonItem *button = [UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"custom-bar-button.png"] style:UIBarButtonItemStylePlain target:self action:@selector(barButtonTapped:)]; 

代替：

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
[button setFrame:CGRectMake(0, 0, 30, 30)]; 
[button setBackgroundImage:[UIImage imageNamed:@"custom-bar-button.png"] forState:UIControlStateNormal]; 
[button addTarget:self action:@selector(barButtonTapped:) forControlEvents:UIControlEventTouchUpInside];