UIBarButton背景圖像顯示問題

Question

我添加了一個UIToolBar到一個UIViewController和在它加入UIBarButton，並且還增加了對顯示圖像的代碼中的背景，但圖像不顯示

這裏是我的代碼

UIBarButtonItem *b1=[[UIBarButtonItem alloc]initWithTitle:@" Home " style:UIBarButtonItemStyleBordered target:self action:@selector(home:)]; 
[b1 setImage:[UIImage imageNamed:@"b1image.png"]]; 

UIBarButtonItem *b3=[[ UIBarButtonItem alloc]initWithTitle:@" WorkOuts " style:UIBarButtonItemStyleBordered target:self action:nil]; 
[b1 setImage:[UIImage imageNamed:@"b3image.png"]]; 

UIBarButtonItem *b4=[[UIBarButtonItem alloc]initWithTitle:@" All Exercises " style:UIBarButtonItemStyleBordered target:self action:@selector(all:)]; 
[b1 setImage:[UIImage imageNamed:@"b4image.png"]]; 

NSArray *li=[[NSArray alloc]initWithObjects:b1,b3,b4, nil]; 

self.toolBar.items=li; 

Answer 1

看一看在documentation爲UIBarButtonItem

您可以使用一個UIButton顯示圖像：

UIImage *image = [UIImage imageNamed:@"b1image"]; 
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
[button setFrame:CGRectMake(0.f, 0.f, image.size.width, image.size.height)]; 
[button setImage:image forState:UIControlStateNormal]; 
[button addTarget:self action:@selector(home:) forControlEvents:UIControlEventTouchUpInside]; 

UIBarButtonItem *b1 = [[UIBarButtonItem alloc] initWithCustomView:button]; 

這應該解決您的問題並正確設置圖像。 setImage:是從另一個類繼承而來，並且對UIBarButtonItem沒有影響。