Question

我有一个应用程序，其中我在导航栏上有一个按钮。点击时我需要在self.view中添加一个子视图。

DemoViewController *demoViewController1 = [[DemoViewController alloc] initWithNibName:@"DemoViewController" bundle:nil]; 
    CGRect frame=demoViewController1.view.frame;
    frame.origin.y = -300;
     [self.view addSubview:demoViewController1.view];
    [UIView animateWithDuration:0.5
                     animations:^{
                         CGRect frame1 = frame;
                         frame1.origin.y = 0;
                         demoViewController1.view.frame = frame1;
                     }];

我尝试通过设置添加视图的帧起点y（它是另一个视图控制器）。来一些negetive值并通过点击将它带到0.但它没有下拉效果。

我需要添加带有下拉视图等动画的视图。再次按下按钮时也需要像这样删除。

有人可以帮我吗？

Answer 1

您将视图添加为子视图，其中的帧不在屏幕上（例如负y坐标）并修改动画帧：

MyView *myView = [[MyView alloc] initWithFrame:CGRectMake(50, -200, 200, 200)];
[self.view addSubview:myView];
[UIView animateWithDuration:0.3
                 animations:^{
                     CGRect frame = myView.frame;
                     frame.origin.y = 0;
                     myView.frame = frame;
                 }];

删除代码：

[UIView animateWithDuration:0.3
                 animations:^{
                     CGRect frame = myView.frame;
                     frame.origin.y = -1 * frame.size.height;
                     myView.frame = frame;
                 }
                 completion:^(BOOL finished) {
                     [myView removeFromSuperview];
                 }];

修改

用以下代码替换您的代码：

DemoViewController *demoViewController1 = [[DemoViewController alloc] initWithNibName:@"DemoViewController" bundle:nil]; CGRect frame=demoViewController1.view.frame; frame.origin.y = -300; demoViewController1.view.frame = frame; // You forgot this line [self.view addSubview:demoViewController1.view]; [UIView animateWithDuration:0.5 animations:^{ CGRect frame1 = demoViewController1.view.frame; frame1.origin.y = 0; demoViewController1.view.frame = frame1; }];

Answer 2

首先在底部保留你的视图当它第一次点击时

这样做

[UIView animateWithDuration:0.3 animations:^{
//keep points that's in a screen
        self.view.center = CGPointMake(x,y,width,height);
}];

第二次点击时在可见屏幕下面给出分数

[UIView animateWithDuration:0.3 animations:^{
//keep points that's in a screen
        self.view.center = CGPointMake(x,y,width,height);
}];

如果你找到比这更好的方法，请告诉我。

Answer 3

[self.yourView setFrame:setYourInitialFrame];
[UIView animateWithDuration: 1.00 animations:^{
    [self.yourView setFrame:setYourFinalFrame];
}];

如何在添加视图时添加动画？

3 个答案: