ios - 自定义 UIBarButtonItem

Question

我正在尝试创建一个自定义 UIBarbuttonItem，它仅使用具有透明度的 png，这样我只有一个图标作为按钮。当我尝试设置按钮图像，将背景设置为白色，并将样式设置为 Plain 时，我仍然会在其周围看到内部阴影和黑色边框。

什么给了？

我已经尝试了下面的代码，它仍然在它周围放置了黑色边框。

UIImage *background = [UIImage imageNamed:@"Dismiss_normal.png"];
UIImage *backgroundSelected = [UIImage imageNamed:@"Dismiss_selected.png"];
self.closeButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.closeButton addTarget:self action:@selector(closeButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; //adding action
[self.closeButton setBackgroundImage:background forState:UIControlStateNormal];
[self.closeButton setBackgroundImage:backgroundSelected forState:UIControlStateSelected];
self.closeButton.frame = CGRectMake(0 ,0,background.size.width, background.size.height);
self.closeButtonItem = [[UIBarButtonItem alloc] initWithCustomView:self.closeButton];
self.navigationItem.leftBarButtonItem = self.closeButtonItem;

我注意到，如果我对按钮进行模态转换，上面的代码周围仍然有黑色边框，但是如果我进行推送转换，它就没有了吗？什么鬼？

Answer 1

您必须将按钮类型设置为自定义，并将图标图像设置为按钮背景。 示例代码:

UIImage *background = [UIImage imageNamed:@"icon.png"];
UIImage *backgroundSelected = [UIImage imageNamed:@"icon_selected.png"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self action:@selector(checkButtonTapped:event:) forControlEvents:UIControlEventTouchUpInside]; //adding action
[button setBackgroundImage:background forState:UIControlStateNormal];
[button setBackgroundImage:backgroundSelected forState:UIControlStateSelected];
button.frame = CGRectMake(0 ,0,35,35);

然后像这样将此按钮设置为您的 BarButtonItem:

UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.leftBarButtonItem = barButton;