Question

我正在尝试使用此代码

向我的导航栏添加重新加载按钮

- (void)viewDidLoad 
 {

   [super viewDidLoad];

   UIButton *butt = [UIButton buttonWithType:UIButtonTypeCustom];   
   [butt setImage:[UIImage imageNamed:@"reload.png"] forState:UIControlStateNormal];
   [butt addTarget:self action:@selector(reloadNews) forControlEvents:UIControlEventTouchUpInside];

   UIBarButtonItem *reloadButton = [[UIBarButtonItem alloc]initWithCustomView:butt];
   self.navigationItem.rightBarButtonItem = reloadButton;
   [reloadButton release]; 

}

在iPhone 3GS设备上运行正常（使用iOS4）但在模拟器和iPhone 4设备上也没有显示png（iOS4也是如此）。有什么想法吗？

顺便说一句：这与我拿电话的方式无关; - ）

Answer 1

通过设置如下框架来修复它：

- (void)viewDidLoad 
 {

   [super viewDidLoad];

   UIButton *butt = [UIButton buttonWithType:UIButtonTypeCustom];   
   [butt setImage:[UIImage imageNamed:@"reload2.png"] forState:UIControlStateNormal];
   [butt addTarget:self action:@selector(reloadNews) forControlEvents:UIControlEventTouchUpInside];
   //added the following line
   butt.frame = CGRectMake(0, 0, 30, 30);

   UIBarButtonItem *reloadButton = [[UIBarButtonItem alloc]initWithCustomView:butt];
   self.navigationItem.rightBarButtonItem = reloadButton;
   [reloadButton release];  

}

为什么UIBarButtonItem不显示Iphone 4上的图像

1 个答案: