如何动画UIBarButtonItem从左侧滑动UIToolbar?

时间:2014-01-17 21:29:52

标签: ios ipad uibarbuttonitem uitoolbar

在我的iOS应用程序中,我有一个带UIToolbar的媒体播放器用于控件。当我触摸播放器屏幕时,我想让UIBarButtonItem从左侧滑动到UIToolbar上。

这是我尝试过的,它确实从左边添加了UIBarButtonItem,但是没有动画部分。

  // create new button
  UIBarButtonItem* b = [[UIBarButtonItem alloc] initWithTitle:@"b"
                                                        style:UIBarButtonItemStyleBordered
                                                       target:self
                                                       action:nil];

  NSMutableArray* temp = [toolbar.items mutableCopy]; // store the items from UIToolbar

  NSMutableArray* newItems = [NSMutableArray arrayWithObject:b]; // add button to be on the left

  [newItems addObjectsFromArray:temp]; // add the "old" items

  [toolbar setItems:newItems animated:YES];

非常感谢任何形式的帮助!

1 个答案:

答案 0 :(得分:1)

我有一个类似的问题,设计师想要在导航栏中使用那种动画。

假设您的应用不需要移动其他按钮,那么您可以这样做:

    // create a UIButton instead of a toolbar button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@"b" forState:UIControlStateNormal];

    // Save the items *before* adding to them
    NSArray *items = toolbar.items;

    // Create a placeholder view to put into the toolbar while animating
    UIView *placeholderView = [[UIView alloc] initWithFrame:button.bounds];
    placeholderView.backgroundColor = [UIColor clearColor];
    [toolbar setItems:[items arrayByAddingObject:[[UIBarButtonItem alloc] initWithCustomView:placeholderView]]
             animated:NO];

    // get the position that is calculated for the placeholderView which has been added to the toolbar
    CGRect finalFrame = [toolbar convertRect:placeholderView.bounds fromView:placeholderView];
    button.frame = CGRectMake(-1*button.bounds.size.width, finalFrame.origin.y, button.bounds.size.width, button.bounds.size.height);
    [toolbar addSubview:button];
    [UIView animateWithDuration:duration
                     animations:^{ button.frame = finalFrame; }
                     completion:^(BOOL finished) {
                         // swap the placeholderView with the button
                         [toolbar setItems:[items arrayByAddingObject:[[UIBarButtonItem alloc] initWithCustomView:button]]
                                  animated:NO];
                     }];

如果您的应用程序 需要移动其他按钮,那么它有点棘手b / c您只需使用customView栏按钮项并获取所有这些按钮项的初始位置,将它们拉出来进入工具栏(以及项目列表之外),为它们设置动画,然后将所有内容放回原处。 (简单,对吧?)祝你好运!