IOS7 : uisearchdisplaycontroller always show scope

问题:

Basically what I'm trying to achieve is to have my scope bar to never disappear.

Environment : IOS 7, storyboard, inside a view controller I have a "search bar and search display controller" and a separate tableview (the searchbar is not inside the table)

Inside the view controller.h

@property (nonatomic, strong) IBOutlet UISearchBar *candySearchBar;

Inside the view controller.m

@synthesize candySearchBar;

What I tried : inside a custom search bar class

- (void) setShowsScopeBar:(BOOL) showsScopeBar
{
    if ([self showsScopeBar] != showsScopeBar) {
        [super invalidateIntrinsicContentSize];
    }
    [super setShowsScopeBar:showsScopeBar];

    [super setShowsScopeBar: YES]; // always show!

    NSLog(@"setShowsScopeBar searchbar");
    NSLog(@"%hhd", showsScopeBar);
}

and

searchBarDidEndEditing

Same thing in the view controller, but then

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [candySearchBar setShowsScopeBar:YES];
    [candySearchBar sizeToFit];
}

I hope my question is clear, I tried many solutions posted all over the internet, most of them talk about the setshowsscopebar, but it doesn't seem to work. The output of the log in setshowscopebar is 1, but the scopebar is still not shown.

I still consider myself to be new to the code, the fault can still be a newbie mistake.

edit : another piece of code in the view controller, as you can see i'm searching blind:

-(void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller{
    self.searchDisplayController.searchBar.showsCancelButton = YES;
    self.searchDisplayController.searchBar.showsScopeBar = YES;
    controller.searchBar.showsScopeBar = TRUE;
    controller.searchBar.frame = CGRectMake(0, 149, 768, 88);
    UIButton *cancelButton;
    UIView *topView = self.searchDisplayController.searchBar.subviews[0];
    for (UIView *subView in topView.subviews) {
        if ([subView isKindOfClass:NSClassFromString(@"UINavigationButton")]) {
            cancelButton = (UIButton*)subView;
        }
    }
    if (cancelButton) {
        //Set the new title of the cancel button
        [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
        [cancelButton setEnabled:YES];
        controller.searchBar.showsScopeBar = YES;
        //candySearchBar.scopeButtonTitles = [NSArray arrayWithObjects:@"Flags", @"Listeners", @"Stations", nil];
    }
    NSLog(@"%@",NSStringFromCGRect(controller.searchBar.frame));
    NSLog(@"%@",NSStringFromCGRect(controller.searchBar.bounds));
    NSLog(@"%hhd@",controller.searchBar.hidden);
}

回答1:

The code you tried will not work in iOS7 onward because apple has changed it behavior of UISearchBar to hide the scope when return to normal view. Add this method to your custom searchBar class.

-(void)layoutSubviews
{
    [super layoutSubviews];
    if([[UIDevice currentDevice].systemVersion floatValue]>=7.0) {
         //Get search bar with scope bar to reappear after search keyboard is dismissed
         [[[[self.subviews objectAtIndex:0] subviews] objectAtIndex:0] setHidden:NO];
         [self setShowsScopeBar:YES];
     }
}

Directly accessing object at index may crash the app in iOS6 because of difference in view hierarchy between iOS6 and iOS7, to avoid this, add this inside if condition only when its iOS7.

In addition this is also required in the custom search bar class

-(void) setShowsScopeBar:(BOOL)showsScopeBar {
    [super setShowsScopeBar:YES]; //Initially make search bar appear with scope bar
}

回答2:

I have the same issue. Perhaps it is something that has changed in iOS7 since showing the scope bar is supposed to be the default behaviour. You can verify this in the section "Creating an Optional Scope Bar to Filter Results" of the following tutorial:

http://www.raywenderlich.com/16873/how-to-add-search-into-a-table-view

Hopefully someone has a solution for this; otherwise we will have to look for a workaround.

回答3:

initialize set scope bar NO

[self.searchBar setShowsScopeBar:NO];
[self.searchBar sizeToFit];

//default scope bar selection
self.searchBar.selectedScopeButtonIndex=3;

unselect/remove tick from scopeBar checkbox

回答4:

It's possible (but hacky) to do this without a custom searchBar, in a pretty similar way to what CoolMonster suggests.

In your TableViewController, this will show the ScopeBar after a search ends:

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller
{
    //Show the scopeBars
    controller.searchBar.showsScopeBar = YES;

    //Resize the searchBar to show ScopeBar
    controller.searchBar.frame = CGRectMake(0, 0, 320, 88);

    if([[UIDevice currentDevice].systemVersion floatValue]>=7.0) {
        [[[[controller.searchBar.subviews objectAtIndex:0] subviews] objectAtIndex:0] setHidden:NO];
    }
}

Then, since you probably want it to appear before you search, add this line to the TableViewController's viewDidLoad:

    [self searchDisplayControllerDidEndSearch:self.searchDisplayController];

For the record, after getting this to work, I ended up using a separate segmented control instead of the approach above for several reasons, not least of which was that touching the ScopeBar of a SearchBar, once you get it to display, launches the search display tableView, which makes of sense if you're using it the recommended way. However, since I wanted the ScopeBar to work without launching the search tableview, for me it made more sense just to use my own segmented control and add it to my tableHeaderView under the searchBar.