右栏按钮中的额外按钮未显示

Question

我在下面的代码中创建了两个UIBarButtonItem。后来我将它们添加到rightBarButtonItems但是只显示了两个按钮中的一个（我在列表中首先放置的那个）。 我想也许标题的视图（未设置）将位于rightBarButtonItems的前面，因为Apple文档说“如果没有足够的空间来显示数组中的所有项目，那些会重叠的项目标题视图（如果存在）或栏左侧的按钮不会显示。“ 但这似乎也不是，因为视图的框架= {0,0} {0,0}

我无法弄清楚我做错了什么。任何人都可以告诉我如何让所有正确的BarButtonItems显示？代码：

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:)];

而不是：

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];