Question

我想将右侧搜索栏向左延伸20 px，并使用动画向右缩短左侧搜索栏20 px。我怎么能这样做？

CGRect leftFrame = self.leftSearchBar.frame;
    //leftFrame.origin.x = leftFrame.origin.x - 20;
    leftFrame.size.width = leftFrame.size.width - 40;

    CGRect rightFrame = self.rightSearchBar.frame;
    rightFrame.origin.x = rightFrame.origin.x - 40;
    rightFrame.size.width = rightFrame.size.width + 40;

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationDelay:0.0];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];

    self.leftSearchBar.frame = leftFrame;
    self.rightSearchBar.frame = rightFrame;

    [UIView commitAnimations];

它不起作用。它首先在没有动画的情况下调整视图大小，然后使用动画移动右视图。

Answer 1

假设你没有改变锚点或类似的东西，只需扩展宽度就会使它向右伸展。在UIView动画块中包装它，它应该根据问题中的规范进行动画处理，如下所示：

UISearchBar* searchbar = ...; // However you've created your UISearchBar, we'll refer to it as 'searchbar'

CGRect searchFrame = searchbar.frame;
[UIView animateWithDuration:0.8 
                      delay:0.0
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{
                     searchFrame.size.width += 30;
                     searchbar.frame = searchFrame;
                 }
                 completion:nil];

您需要确保+= 30不会被多次调用，否则每次调用会增加30点。如果你事先知道尺寸，你可以简单地用= size + 30替换它，这是一个更安全的赌注，因为你不止一次调用动画。

如何用动画在x方向延长UISearchBar？

1 个答案: