iOS关于自定义rightBarButtonItem

 

   常规设置UIBarButtonItem如下：

     UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    button.frame = CGRectMake(0 , 0, 44, 44);
    [button setImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
    [self.view addSubview:button];

    // 设置rightBarButtonItem
    UIBarButtonItem *rightItem =[[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.rightBarButtonItem = leftItem;

 效果如图：rightItem搜索按钮距离屏幕右侧有一定间距。

 

有间距

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    button.frame = CGRectMake(0 , 0, 44, 44);
    [button setImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
    [self.view addSubview:button];
    UIBarButtonItem *rightItem =[[UIBarButtonItem alloc] initWithCustomView:button];
//    self.navigationItem.rightBarButtonItem = rightItem;

    //增加了一个spaceItem元素,用来控制customView距离右边的间距
    UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];

    //rightBarButtonItem中包装的button距离它父控件,也就是rightBarButtonItem的值是5,当我们把width设置为-15后,相当于把整个rightBarButtonItem向右移动了10
    spaceItem.width = -15;
    self.navigationItem.rightBarButtonItems = @[spaceItem,rightItem];

修改后效果如下：