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Tweaks/FLEX/GlobalStateExplorers/FLEXObjectListViewController.m
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250
Tweaks/FLEX/GlobalStateExplorers/FLEXObjectListViewController.m
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//
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// FLEXObjectListViewController.m
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// Flipboard
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//
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// Created by Ryan Olson on 5/28/14.
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// Copyright (c) 2020 FLEX Team. All rights reserved.
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//
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#import "FLEXObjectListViewController.h"
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#import "FLEXObjectExplorerFactory.h"
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#import "FLEXObjectExplorerViewController.h"
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#import "FLEXMutableListSection.h"
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#import "FLEXRuntimeUtility.h"
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#import "FLEXUtility.h"
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#import "FLEXHeapEnumerator.h"
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#import "FLEXObjectRef.h"
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#import "NSString+FLEX.h"
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#import "NSObject+FLEX_Reflection.h"
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#import "FLEXTableViewCell.h"
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#import <malloc/malloc.h>
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typedef NS_ENUM(NSUInteger, FLEXObjectReferenceSection) {
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FLEXObjectReferenceSectionMain,
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FLEXObjectReferenceSectionAutoLayout,
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FLEXObjectReferenceSectionKVO,
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FLEXObjectReferenceSectionFLEX,
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FLEXObjectReferenceSectionCount
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};
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@interface FLEXObjectListViewController ()
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@property (nonatomic, readonly, class) NSArray<NSPredicate *> *defaultPredicates;
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@property (nonatomic, readonly, class) NSArray<NSString *> *defaultSectionTitles;
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@property (nonatomic, copy) NSArray<FLEXMutableListSection *> *sections;
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@property (nonatomic, copy) NSArray<FLEXMutableListSection *> *allSections;
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@property (nonatomic, readonly, nullable) NSArray<FLEXObjectRef *> *references;
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@property (nonatomic, readonly) NSArray<NSPredicate *> *predicates;
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@property (nonatomic, readonly) NSArray<NSString *> *sectionTitles;
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@end
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@implementation FLEXObjectListViewController
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@dynamic sections, allSections;
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#pragma mark - Reference Grouping
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+ (NSPredicate *)defaultPredicateForSection:(NSInteger)section {
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// These are the types of references that we typically don't care about.
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// We want this list of "object-ivar pairs" split into two sections.
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BOOL(^isKVORelated)(FLEXObjectRef *, NSDictionary *) = ^BOOL(FLEXObjectRef *ref, NSDictionary *bindings) {
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NSString *row = ref.reference;
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return [row isEqualToString:@"__NSObserver object"] ||
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[row isEqualToString:@"_CFXNotificationObjcObserverRegistration _object"];
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};
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/// These are common AutoLayout related references we also rarely care about.
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BOOL(^isConstraintRelated)(FLEXObjectRef *, NSDictionary *) = ^BOOL(FLEXObjectRef *ref, NSDictionary *bindings) {
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static NSSet *ignored = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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ignored = [NSSet setWithArray:@[
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@"NSLayoutConstraint _container",
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@"NSContentSizeLayoutConstraint _container",
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@"NSAutoresizingMaskLayoutConstraint _container",
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@"MASViewConstraint _installedView",
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@"MASLayoutConstraint _container",
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@"MASViewAttribute _view"
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]];
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});
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NSString *row = ref.reference;
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return ([row hasPrefix:@"NSLayout"] && [row hasSuffix:@" _referenceItem"]) ||
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([row hasPrefix:@"NSIS"] && [row hasSuffix:@" _delegate"]) ||
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([row hasPrefix:@"_NSAutoresizingMask"] && [row hasSuffix:@" _referenceItem"]) ||
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[ignored containsObject:row];
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};
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/// These are FLEX classes and usually you aren't looking for FLEX references inside FLEX itself
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BOOL(^isFLEXClass)(FLEXObjectRef *, NSDictionary *) = ^BOOL(FLEXObjectRef *ref, NSDictionary *bindings) {
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return [ref.reference hasPrefix:@"FLEX"];
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};
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BOOL(^isEssential)(FLEXObjectRef *, NSDictionary *) = ^BOOL(FLEXObjectRef *ref, NSDictionary *bindings) {
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return !(
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isKVORelated(ref, bindings) ||
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isConstraintRelated(ref, bindings) ||
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isFLEXClass(ref, bindings)
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);
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};
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switch (section) {
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case FLEXObjectReferenceSectionMain:
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return [NSPredicate predicateWithBlock:isEssential];
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case FLEXObjectReferenceSectionAutoLayout:
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return [NSPredicate predicateWithBlock:isConstraintRelated];
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case FLEXObjectReferenceSectionKVO:
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return [NSPredicate predicateWithBlock:isKVORelated];
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case FLEXObjectReferenceSectionFLEX:
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return [NSPredicate predicateWithBlock:isFLEXClass];
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default: return nil;
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}
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}
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+ (NSArray<NSPredicate *> *)defaultPredicates {
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return [NSArray flex_forEachUpTo:FLEXObjectReferenceSectionCount map:^id(NSUInteger i) {
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return [self defaultPredicateForSection:i];
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}];
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}
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+ (NSArray<NSString *> *)defaultSectionTitles {
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return @[
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@"", @"AutoLayout", @"Key-Value Observing", @"FLEX"
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];
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}
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#pragma mark - Initialization
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- (id)initWithReferences:(nullable NSArray<FLEXObjectRef *> *)references {
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return [self initWithReferences:references predicates:nil sectionTitles:nil];
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}
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- (id)initWithReferences:(NSArray<FLEXObjectRef *> *)references
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predicates:(NSArray<NSPredicate *> *)predicates
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sectionTitles:(NSArray<NSString *> *)sectionTitles {
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NSParameterAssert(predicates.count == sectionTitles.count);
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self = [super initWithStyle:UITableViewStylePlain];
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if (self) {
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_references = references;
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_predicates = predicates;
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_sectionTitles = sectionTitles;
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}
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return self;
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}
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+ (UIViewController *)instancesOfClassWithName:(NSString *)className retained:(BOOL)retain {
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NSArray<FLEXObjectRef *> *references = [FLEXHeapEnumerator
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instancesOfClassWithName:className retained:retain
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];
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if (references.count == 1) {
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return [FLEXObjectExplorerFactory
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explorerViewControllerForObject:references.firstObject.object
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];
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}
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FLEXObjectListViewController *controller = [[self alloc] initWithReferences:references];
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controller.title = [NSString stringWithFormat:@"%@ (%@)", className, @(references.count)];
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return controller;
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}
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+ (instancetype)subclassesOfClassWithName:(NSString *)className {
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NSArray<FLEXObjectRef *> *references = [FLEXHeapEnumerator subclassesOfClassWithName:className];
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FLEXObjectListViewController *controller = [[self alloc] initWithReferences:references];
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controller.title = [NSString stringWithFormat:@"Subclasses of %@ (%@)",
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className, @(references.count)
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];
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return controller;
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}
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+ (instancetype)objectsWithReferencesToObject:(id)object retained:(BOOL)retain {
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static Class SwiftObjectClass = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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SwiftObjectClass = NSClassFromString(@"SwiftObject");
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if (!SwiftObjectClass) {
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SwiftObjectClass = NSClassFromString(@"Swift._SwiftObject");
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}
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});
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NSArray<FLEXObjectRef *> *instances = [FLEXHeapEnumerator
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objectsWithReferencesToObject:object retained:retain
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];
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FLEXObjectListViewController *viewController = [[self alloc]
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initWithReferences:instances
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predicates:self.defaultPredicates
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sectionTitles:self.defaultSectionTitles
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];
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viewController.title = [NSString stringWithFormat:@"Referencing %@ %p",
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[FLEXRuntimeUtility safeClassNameForObject:object], object
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];
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return viewController;
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}
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#pragma mark - Overrides
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- (void)viewDidLoad {
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[super viewDidLoad];
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self.showsSearchBar = YES;
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}
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- (NSArray<FLEXMutableListSection *> *)makeSections {
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if (self.predicates.count) {
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return [self buildSections:self.sectionTitles predicates:self.predicates];
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} else {
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return @[[self makeSection:self.references title:nil]];
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}
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}
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#pragma mark - Private
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- (NSArray *)buildSections:(NSArray<NSString *> *)titles predicates:(NSArray<NSPredicate *> *)predicates {
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NSParameterAssert(titles.count == predicates.count);
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NSParameterAssert(titles); NSParameterAssert(predicates);
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return [NSArray flex_forEachUpTo:titles.count map:^id(NSUInteger i) {
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NSArray *rows = [self.references filteredArrayUsingPredicate:predicates[i]];
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return [self makeSection:rows title:titles[i]];
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}];
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}
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- (FLEXMutableListSection *)makeSection:(NSArray *)rows title:(NSString *)title {
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FLEXMutableListSection *section = [FLEXMutableListSection list:rows
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cellConfiguration:^(FLEXTableViewCell *cell, FLEXObjectRef *ref, NSInteger row) {
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cell.textLabel.text = ref.reference;
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cell.detailTextLabel.text = ref.summary;
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cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
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} filterMatcher:^BOOL(NSString *filterText, FLEXObjectRef *ref) {
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if (ref.summary && [ref.summary localizedCaseInsensitiveContainsString:filterText]) {
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return YES;
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}
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return [ref.reference localizedCaseInsensitiveContainsString:filterText];
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}
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];
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section.selectionHandler = ^(UIViewController *host, FLEXObjectRef *ref) {
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[host.navigationController pushViewController:[
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FLEXObjectExplorerFactory explorerViewControllerForObject:ref.object
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] animated:YES];
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};
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section.customTitle = title;
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return section;
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}
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@end
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