我有一个应用程序,可搜索13,000个单元格中的文本。我知道这是很多细胞。在较旧的iphone上,搜索需要几秒钟,因此我想提供一个指示器视图,向用户显示应用程序仍在运行。我想出了将UISearchBar放大镜改为UIActivityIndicatorView的想法。代码在模拟器中工作,但是当我在旧的ipod touch上测试时,微调器不显示。它实际上确实显示,但只有在搜索完成后才会显示。知道为什么?这是代码。
- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
UIActivityIndicatorView *spin = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
CGRect spinnerFrame = CGRectMake(12.0, 12.0, 20.0, 20.0);
spin.frame = spinnerFrame;
spin.clipsToBounds = YES;
spin.backgroundColor = [UIColor whiteColor];
[searchBar addSubview:spin];
[spin startAnimating];
[self performSelectorOnMainThread:@selector(filterContentForSearchText:) withObject:searchBar.text waitUntilDone:YES];
[spin stopAnimating];
[spin removeFromSuperview];
//[self filterContentForSearchText:searchBar.text];
[self.searchDisplayController.searchContentsController.navigationController setNavigationBarHidden:NO animated:YES];
[self.searchDisplayController.searchResultsTableView reloadData];
}
答案 0 :(得分:1)
将搜索栏替换为:
@interface _SearchBarWithSpinner : UISearchBar
{
UIActivityIndicatorView *_spinnerView;
UIView *_searchIconView;
UITextField *_internalTextField;
}
- (void)showSpinner;
- (void)hideSpinner;
@end
@implementation _SearchBarWithSpinner
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if(self)
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(textFieldDidBeginEditingNotification:)
name:UITextFieldTextDidBeginEditingNotification
object:nil];
}
return self;
}
- (void)showSpinner
{
if(_internalTextField)
{
if(_spinnerView == nil)
_spinnerView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[_internalTextField setLeftView:_spinnerView];
[_spinnerView startAnimating];
}
}
- (void)hideSpinner
{
[_spinnerView stopAnimating];
[_internalTextField setLeftView:_searchIconView];
}
#pragma mark - Private
- (void)textFieldDidBeginEditingNotification:(NSNotification *)notification
{
if(_internalTextField == nil)
{
UITextField *editedTextField = notification.object;
UIView *superView = editedTextField.superview;
while(superView && superView != self)
superView = superView.superview;
if(superView == self)
{
_internalTextField = editedTextField;
_searchIconView = _internalTextField.leftView;
}
}
}
@end