Question

我尝试使用 UINavigationItem setLeftBarButtonItem 和 setRightBarButtonItem

以编程方式创建标准导航栏

我想拥有看起来像

的NavigationItem

[ < BACKTEXT     FWDTEXT > ]

我希望在我的图像（箭头）和设备边缘之间保持恒定的空间。我还想在图像和文本之间保持一个恒定的空间。

我在 UIBarButtonItem 上创建了一个类别，并添加了两个方法 backButtonWith 和 fwdButtonWith

我读了@Split useful answer，解释了如何解决右键

button.titleEdgeInsets = UIEdgeInsetsMake(0, - button.imageView.frame.size.width, 0, button.imageView.frame.size.width);
button.imageEdgeInsets = UIEdgeInsetsMake(0, button.titleLabel.frame.size.width, 0, -button.titleLabel.frame.size.width);

但是我很难解决后退按钮。

这是我的代码

- (UIBarButtonItem *)buttonWith:(BOOL) directionLeft title:(NSString *)title image:(UIImage *) buttonImage tintColor:(UIColor *)color target:(id)target andAction:(SEL)action{
  UIButton *barButton;
  barButton = [UIButton buttonWithType:UIButtonTypeCustom];
  float buttonWidth = 130.0f;
  [barButton setFrame:CGRectMake(0, 0, buttonWidth, 20.5f)];
  [barButton setTitle:title forState:UIControlStateNormal];
  [barButton setTitleColor:color forState:UIControlStateNormal];
  const CGFloat* components = CGColorGetComponents(color.CGColor);
  [barButton setTitleColor:[UIColor colorWithRed:components[0] green:components[1] blue:components[2] alpha:0.3f] forState:UIControlStateHighlighted];

  UIEdgeInsets titleEdgeInsets;
  UIEdgeInsets imageEdgeInsets;
  UIImage *image = [self image:buttonImage tintedWithColor:color fraction:0.0];
  [barButton setImage:image forState:UIControlStateNormal];
  [barButton setImage:[self image:image byApplyingAlpha:0.3] forState:UIControlStateHighlighted];

  [barButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
  if(directionLeft == YES){
     titleEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);//THIS PARAMS SHOULD BE CONFIGURED
     imageEdgeInsets = UIEdgeInsetsMake(0,0,0,0);
  }else{
      titleEdgeInsets = UIEdgeInsetsMake(0, -barButton.imageView.frame.size.width, 0, barButton.imageView.frame.size.width);
      imageEdgeInsets = UIEdgeInsetsMake(0, barButton.titleLabel.frame.size.width, 0, -barButton.titleLabel.frame.size.width);
  }
  barButton.imageEdgeInsets = imageEdgeInsets;
  barButton.titleEdgeInsets = titleEdgeInsets;

  UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:barButton];
  return barButtonItem;
}

Answer 1

您设置为UINavigationItem的后退按钮将显示在下一个导航项上，该导航项将被推送到导航栏。您不会看到当前导航项目。另外，我记得，后退按钮不能包含自定义视图，它应该是普通的UIBarButtonItem。

您可以使用

自定义后退按钮的外观

[UIBarButtonItem appearanceWhenContainedIn:<YourNavigationBar.class>]

或具有一般外观

[UIBarButtonItem appearance]

有关后退按钮项目外观自定义的详细信息，请查看此question

在导航栏中添加左右UIBarButtonItem

1 个答案: