ios - UISearchBar AutoLayout Error en la presentación de searchResultsController

objective-c

Question

Estoy intentando que UISearchBar + UISearchController funcione en Obj-C, siguiendo junto con el código de ejemplo de Apple aquí . No quiero configurar la barra de búsqueda en un encabezado de vista de tabla, como lo hacen en el ejemplo, entonces estoy estableciendo restricciones para pegarlo en la parte superior del controlador de vista principal. Esto funciona bien para el posicionamiento, pero cuando toco la barra de búsqueda e intenta presentar modalmente el controlador de vista de tabla de resultados ( searchResultsTVC ), arroja un error sobre las restricciones:

2015-02-01 00:36:47.539 Search-FeatureTest[15521:3760972] The view hierarchy is not prepared for the constraint: <NSLayoutConstraint:0x7fc911c77f90 UISearchBar:0x7fc911c6b880.left == UIView:0x7fc911c69b70.left>
When added to a view, the constraint''s items must be descendants of that view (or the view itself). This will crash if the constraint needs to be resolved before the view hierarchy is assembled. Break on -[UIView _viewHierarchyUnpreparedForConstraint:] to debug.
2015-02-01 00:36:47.539 Search-FeatureTest[15521:3760972] *** Assertion failure in -[UIView _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/NSLayoutConstraint_UIKitAdditions.m:560
2015-02-01 00:36:47.541 Search-FeatureTest[15521:3760972] *** Terminating app due to uncaught exception ''NSInternalInconsistencyException'', reason: ''Impossible to set up layout with view hierarchy unprepared for constraint.''
*** First throw call stack:
(
0 CoreFoundation 0x00000001047aef35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000104447bb7 objc_exception_throw + 45
2 CoreFoundation 0x00000001047aed9a +[NSException raise:format:arguments:] + 106
3 Foundation 0x00000001040645df -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 UIKit 0x0000000105215cf2 __120-[UIView(UIConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:]_block_invoke_2 + 177
5 UIKit 0x0000000105215be7 -[UIView(UIConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 377
6 UIKit 0x0000000105215ea4 -[UIView(UIConstraintBasedLayout) _tryToAddConstraintWithoutUpdatingConstraintsArray:roundingAdjustment:mutuallyExclusiveConstraints:] + 30
7 UIKit 0x0000000105215fcc -[UIView(UIConstraintBasedLayout) _tryToAddConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 243
8 UIKit 0x000000010521630b __50-[UIView(UIConstraintBasedLayout) addConstraints:]_block_invoke + 188
9 Foundation 0x0000000103fedd6e -[NSISEngine withBehaviors:performModifications:] + 155
10 UIKit 0x0000000105216240 -[UIView(UIConstraintBasedLayout) addConstraints:] + 263
11 UIKit 0x000000010520f112 -[_UISearchPresentationController presentationTransitionWillBegin] + 759
12 UIKit 0x0000000104ca00a7 __71-[UIPresentationController _initViewHierarchyForPresentationSuperview:]_block_invoke + 1398
13 UIKit 0x0000000104c9eb50 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 175
14 UIKit 0x0000000104bbe331 _applyBlockToCFArrayCopiedToStack + 314
15 UIKit 0x0000000104bbe1ab _afterCACommitHandler + 516
16 CoreFoundation 0x00000001046e3dc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
17 CoreFoundation 0x00000001046e3d20 __CFRunLoopDoObservers + 368
18 CoreFoundation 0x00000001046d9b53 __CFRunLoopRun + 1123
19 CoreFoundation 0x00000001046d9486 CFRunLoopRunSpecific + 470
20 GraphicsServices 0x0000000107d7d9f0 GSEventRunModal + 161
21 UIKit 0x0000000104b9b420 UIApplicationMain + 1282
22 Search-FeatureTest 0x0000000103f19043 main + 115
23 libdyld.dylib 0x0000000106d3e145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Aquí está el código donde inicializo el controlador de búsqueda y las restricciones de la barra de búsqueda:

- (void)viewDidLoad {
[super viewDidLoad];
self.searchResultsTVC = [[SearchResultsTVC alloc]init];
self.allObjects = [NSMutableArray arrayWithArray:@[@"A", @"AA", @"ABBA", @"B", @"BOB", @"C", @"D", @"E", @"F", @"G", @"H"]];
self.searchController = [[UISearchController alloc]initWithSearchResultsController:self.searchResultsTVC];
[self.searchController setSearchResultsUpdater:self];
[self.searchController setDelegate:self];
[self.searchController.searchBar setDelegate:self];
[self.view addSubview:self.searchController.searchBar];
//constraints for searchBar
[self.searchController.searchBar setTranslatesAutoresizingMaskIntoConstraints:NO];
UISearchBar *searchBar = self.searchController.searchBar;
id topLayoutGuide = self.topLayoutGuide;
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[searchBar]|" options:NSLayoutFormatDirectionLeftToRight metrics:nil views:NSDictionaryOfVariableBindings(searchBar)]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[topLayoutGuide][searchBar]" options:NSLayoutFormatDirectionLeftToRight metrics:nil views:NSDictionaryOfVariableBindings(topLayoutGuide, searchBar)]];
}

Answer 1

Solución: (En respuesta a Darmen)

Como lo sugirió Zoo, agregué una vista de contenedor en el constructor de interfaz, restringida a la parte superior y a los lados de la supervista, con una altura de 44.

Luego coloco la barra de búsqueda en la vista de esta manera:

- (void)viewDidLoad {
[super viewDidLoad];
self.searchController = [[UISearchController alloc]initWithSearchResultsController:<Your SearchResultsController>];
[self.searchController setSearchResultsUpdater:self];
[self.searchController setDelegate:self];
[self.searchController.searchBar setDelegate:self];
[self.searchBarContainer addSubview:self.searchController.searchBar];
self.definesPresentationContext = YES;
}