7

我想在导航栏中添加一个“书签”按钮作为 rightBarButtonItem

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Add bookmark button
    UIBarButtonItem *bookmarkBarButton = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:self action:@selector(bookmark:)];
    [bookmarkBarButton setImage:[UIImage imageNamed:@"greyBookmark.png"]];
    [self.navigationItem setRightBarButtonItem:bookmarkBarButton];
    bookmarkBarButton.tintColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.9f];
    b_bookmarked = false;
}

// Will call this method when the bookmark button is pressed
- (IBAction)bookmark:(id)sender
{
    // Toggle color of bookmark icon on button
    if ( (b_bookmarked = !b_bookmarked) )
    {
        [self.navigationItem.rightBarButtonItem setImage:[UIImage imageNamed:@"blueBookmark.png"]];
    }
    else
    {
        [self.navigationItem.rightBarButtonItem setImage:[UIImage imageNamed:@"greyBookmark.png"]];
    }

    // Save bookmark

}

grayBookmark.png 和 blueBookmark.png 的大小均为 10x26。出现视图时按钮看起来变窄。但是当我单击此按钮时，按钮变宽，图像仍然会发生变化。在书签中调用 setImage 方法时宽度会发生变化：方法（恢复为默认大小）。我试图通过调用 [navigationItem.rightBarButtonItem setWidth:] 来明确设置宽度 - 也无济于事。根据文档，在此之前，宽度属性设置为 0，并且按钮应根据其图像大小调整大小。

我希望 rightBarButtonItem 具有 const 宽度。在第二次调用 setImage 之后它变得更宽有什么原因吗？

4

1 回答 1

6 
UIImage *myImage = [UIImage imageNamed:@"greyBookmark.png"];
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton setImage:myImage forState:UIControlStateNormal];
myButton.showsTouchWhenHighlighted = YES;
myButton.frame = CGRectMake(0.0, 3.0, 70,30);
[myButton addTarget:self action:@selector(BookmarkButtonPressed) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightbutton = [[UIBarButtonItem alloc] initWithCustomView:myButton];
self.navigationItem.rightBarButtonItem = rightbutton;

把这个方法放在viewDidLoad

-(void)BookmarkButtonPressed

{

      //Do ur work here for Button Action

}
于 2013-03-01T05:32:57.537 回答