iphone - UINavigationBar iphone中的setBackBarButtonItem中的UIImage

Question

我在导航栏的 BackBarButtonItem 中添加图像，图像进入按钮，但图像不是按比例填充的问题。

这是我正在使用的代码，它以下列方式显示。

UIImage *backImage = [UIImage imageNamed:@"back.png"];
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithImage:backImage style:UIBarButtonItemStylePlain target:self action:@selector(backAction)];
[self.navigationItem setBackBarButtonItem: newBackButton];
[newBackButton release];
[backImage release];

实际上它应该如下图所示。

谢谢！

Answer 1

[self.navigationItem setHidesBackButton:YES];
[self.navigationItem setLeftBarButtonItem:newBackButton];

试试这个 ：）！

Answer 2

problem is your image size.check it!
You can also use

//custom back button
    button =  [UIButton buttonWithType:UIButtonTypeCustom];
    [button setBackgroundImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];

    [button addTarget:self action:@selector(backButtonClicked) forControlEvents:UIControlEventTouchUpInside];
    [button setFrame:CGRectMake(-2, 0, 52, 30)];



    UIBarButtonItem *btnItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.leftBarButtonItem = btnItem;
    [btnItem release];
}