Ios 点击UIButton时如何显示搜索栏

我想在一个普通的VC中添加一个搜索栏，当你在那个视图中点击一个按钮时

---

有没有一种简单/优雅的方法？我认为我必须以编程方式创建动画，但我不知道有什么好的解决方案可以将动画添加到过渡中，而不是仅仅显示和隐藏它们。

尝试以下以编程方式创建动画：-

  UISearchBar *searchBar = [[UISearchBar alloc] 
   initWithFrame:CGRectMake(0, 70, 320, 44)];


  //Now add in your view once you click on 
   button
  [self.view addSubView:searchBar];

---

尝试以下方法以编程方式创建：-

  UISearchBar *searchBar = [[UISearchBar alloc] 
   initWithFrame:CGRectMake(0, 70, 320, 44)];


  //Now add in your view once you click on 
   button
  [self.view addSubView:searchBar];

---

首先在ViewController.h中声明对象

@interface ViewController ()
{
    UISearchBar *searchBar;
}
@end

而不是在ViewController的viewDidLoad中设置帧。m:

searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0,0, 320, 44)];

searchBar.hidden=YES;

现在在按钮上添加动画：

- (IBAction)btnEvent:(id)sender
{
   searchBar.hidden=NO;
   [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
   [UIView animateWithDuration:0.25 animations:^{
          searchBar.frame = CGRectMake(0, 20, 320, 44);
          [self.view addSubview:searchBar];
   }];
}

---

首先在ViewController.h中声明对象

@interface ViewController ()
{
    UISearchBar *searchBar;
}
@end

而不是在ViewController的viewDidLoad中设置帧。m:

searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0,0, 320, 44)];

searchBar.hidden=YES;

现在在按钮上添加动画：

- (IBAction)btnEvent:(id)sender
{
   searchBar.hidden=NO;
   [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
   [UIView animateWithDuration:0.25 animations:^{
          searchBar.frame = CGRectMake(0, 20, 320, 44);
          [self.view addSubview:searchBar];
   }];
}