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Add dirty version of ORHorizontalStackView
1 parent 0186564 commit 00eaa79

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‎Classes/ios/ORHorizontalStackView.h‎

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//
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// ORHorizontalStackView.h
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// ORStackView
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//
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// Created by Denis Lebedev on 4/23/15.
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//
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//
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@interface ORHorizontalStackView : UIView
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/// Adds a view to the heirarchy, if it's the first it is
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/// attached to the top, otherwise to the view above.
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- (void)addSubview:(UIView *)view withTopMargin:(CGFloat)margin;
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/// Adds a view to the heirarchy like addSubview:withTopMargin:
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/// will also center and apply side margins as insets from edge
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- (void)addSubview:(UIView *)view withTopMargin:(CGFloat)topMargin sideMargin:(CGFloat)sideMargin;
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/// Adds a view controller's view to the stack heirarchy
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- (void)addViewController:(UIViewController *)viewController toParent:(UIViewController *)parentViewController withTopMargin:(CGFloat)margin;
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/// Adds a view controller's view to the stack heirarchy, and applys edge insets
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- (void)addViewController:(UIViewController *)viewController toParent:(UIViewController *)parentViewController withTopMargin:(CGFloat)margin sideMargin:(CGFloat)sideMargin;
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// Note: These indexes are not z-order, but stack order.
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// z-index ordering can be done with the UIView methods bringSubviewToFront:
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/// Insert a subview at an arbitrary index in the stack's order
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- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index withTopMargin:(CGFloat)margin;
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/// Inserts a subview and centeres it
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- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index withTopMargin:(CGFloat)topMargin sideMargin:(CGFloat)sideMargin;
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/// Insert a subview below another view, or at the end if it cannot be found
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- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview withTopMargin:(CGFloat)margin;
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/// Insert a subview above another view, will assert if view is not found
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- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview withTopMargin:(CGFloat)margin;
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/// Remove a subview from the Stack View
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- (void)removeSubview:(UIView *)subview;
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/// Remove all subviews from the Stack View
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- (void)removeAllSubviews;
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/// Perform insertion / removals without updating the constraints
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- (void)performBatchUpdates:(void (^)(void))updates;
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// Useful getters
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/// Returns the top constraint for a specific view
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- (NSLayoutConstraint *)topConstraintForView:(UIView *)view;
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/// Returns the lowest view in the stack.
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- (UIView *)lastView;
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/// Setting this creates a bottom constraint letting the ORStackView set it's own height, defaults to 0, use NSNotFound to not create a bttom constraint.
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@property (nonatomic, assign) CGFloat trailingMarginWidth;
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/// Settings this will create a constraint on the top view making the view sit below the layout guide (and the top margin)
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@property (nonatomic, strong) id<UILayoutSupport> topLayoutGuide;
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/// I'd prefer you to not use the UIView subview APIs please, things will break.
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- (void)addSubview:(UIView *)view __attribute__((unavailable("addSubview is not supported on ORStackView.")));
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- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index __attribute__((unavailable("insertSubview is not supported on ORStackView.")));
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- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview __attribute__((unavailable("insertSubview is not supported on ORStackView.")));
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- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview __attribute__((unavailable("insertSubview is not supported on ORStackView.")));
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@end

‎Classes/ios/ORHorizontalStackView.m‎

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//
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// ORHorizontalStackView.m
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// ORStackView
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//
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// Created by Dzianis Lebedzeu on 4/23/15.
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//
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//
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#import "ORHorizontalStackView.h"
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#import <FLKAutoLayout/UIView+FLKAutoLayout.h>
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#import "ORStackView+Private.h"
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@interface ORHorizontalStackView()
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/// Delay updating constraints when true
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@property (nonatomic, assign) BOOL batchingUpdates;
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@property (nonatomic, strong) NSLayoutConstraint *trailingConstraint;
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// TODO: move to private
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/// An array of StackView objects in the order they should be shown
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@property (nonatomic, strong) NSMutableArray *viewStack;
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@end
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@implementation ORHorizontalStackView
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- (instancetype)initWithFrame:(CGRect)frame
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{
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self = [super initWithFrame:frame];
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if (!self) return nil;
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[self _setup];
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return self;
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}
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- (instancetype)init
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{
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return [self initWithFrame:CGRectZero];
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}
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- (void)awakeFromNib
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{
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[self _setup];
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}
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- (void)_setup
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{
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_viewStack = [NSMutableArray array];
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_trailingMarginWidth = 0;
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}
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- (void)updateConstraints
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{
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// Remove all constraints
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for (StackView *stackView in self.viewStack) {
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[self removeConstraint:stackView.topConstraint];
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}
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// Add the new constraints
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for (StackView *stackView in self.viewStack) {
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UIView *view = stackView.view;
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NSString *predicate = @(stackView.constant).stringValue;
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NSInteger index = [self.viewStack indexOfObject:stackView];
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if (index == 0) {
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stackView.topConstraint = [[view alignLeadingEdgeWithView:self predicate:predicate] lastObject];
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} else {
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UIView *viewAbove = [self.viewStack[index - 1] view];
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stackView.topConstraint = [[view constrainLeadingSpaceToView:viewAbove predicate:predicate] lastObject];
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}
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}
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if (self.trailingMarginWidth != NSNotFound) {
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[self removeConstraint:self.trailingConstraint];
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UIView *lastView = self.lastView;
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if (self.lastView) {
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NSString *constraint = [NSString stringWithFormat:@"%0.0f", self.trailingMarginWidth];
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self.trailingConstraint = [[self alignTrailingEdgeWithView:lastView predicate:constraint] lastObject];
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}
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}
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[super updateConstraints];
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}
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#pragma mark - Adding Subviews
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- (void)addSubview:(UIView *)view withTopMargin:(CGFloat)margin
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{
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[self _addSubview:view withTopMargin:margin centered:NO sideMargin:0];
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}
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- (void)addSubview:(UIView *)view withTopMargin:(CGFloat)topMargin sideMargin:(CGFloat)sideMargin
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{
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[self _addSubview:view withTopMargin:topMargin centered:YES sideMargin:sideMargin];
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}
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- (void)_addSubview:(UIView *)view withTopMargin:(CGFloat)topMargin centered:(BOOL)centered sideMargin:(CGFloat)sideMargin
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{
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NSInteger index = self.viewStack.count;
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[self _insertSubview:view atIndex:index withTopMargin:topMargin centered:centered sideMargin:sideMargin];
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}
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#pragma mark - Inserting Subviews
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- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index withTopMargin:(CGFloat)margin;
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{
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[self _insertSubview:view atIndex:index withTopMargin:margin centered:NO sideMargin:0];
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}
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- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index withTopMargin:(CGFloat)topMargin sideMargin:(CGFloat)sideMargin
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{
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[self _insertSubview:view atIndex:index withTopMargin:topMargin centered:YES sideMargin:sideMargin];
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}
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- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview withTopMargin:(CGFloat)margin
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{
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BOOL hasSibling = [self.subviews containsObject:siblingSubview];
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NSInteger index = hasSibling ? [self indexOfView:siblingSubview] : self.viewStack.count;
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[self _insertSubview:view atIndex:index withTopMargin:margin centered:NO sideMargin:0];
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}
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- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview withTopMargin:(CGFloat)margin
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{
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NSAssert([self.subviews containsObject:siblingSubview], @"SiblingSubview not found in ORStackView");
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NSInteger index = [self indexOfView:siblingSubview] - 1;
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[self _insertSubview:view atIndex:index withTopMargin:margin centered:NO sideMargin:0];
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}
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- (void)_insertSubview:(UIView *)view atIndex:(NSInteger)index withTopMargin:(CGFloat)topMargin centered:(BOOL)centered sideMargin:(CGFloat)sideMargin
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{
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NSParameterAssert(view);
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if ([self.subviews containsObject:view]) return;
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[super addSubview:view];
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StackView *stackView = [[StackView alloc] init];
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stackView.view = view;
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stackView.constant = topMargin;
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[self.viewStack insertObject:stackView atIndex:index];
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// NSString *vhl = [NSString stringWithFormat:@"V:[topLayoutGuide]-%@-[view]", predicate];
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// NSArray *constraints = [NSLayoutConstraint constraintsWithVisualFormat:vhl options:NSLayoutFormatDirectionLeadingToTrailing metrics:nil views:NSDictionaryOfVariableBindings(view, topLayoutGuide)];
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// [self addConstraints:constraints];
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// stackView.topConstraint = [constraints firstObject];
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if (centered) {
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//TODO: handle topLayoutGuide here
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[view constrainHeightToView:self predicate:@(-sideMargin).stringValue];
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[view alignCenterYWithView:self predicate:nil];
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}
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if (!self.batchingUpdates) [self setNeedsUpdateConstraints];
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}
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#pragma mark Removal
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- (void)removeSubview:(UIView *)subview
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{
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if (![self.subviews containsObject:subview]) return;
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[subview removeFromSuperview];
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for (StackView *stackView in self.viewStack.copy) {
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if ([subview isEqual:stackView.view]) {
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[self.viewStack removeObject:stackView];
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}
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}
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if (!self.batchingUpdates) [self setNeedsUpdateConstraints];
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}
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- (void)removeAllSubviews
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{
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for (StackView *stackView in [self.viewStack copy]) {
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[self.viewStack removeObject:stackView];
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[stackView.view removeFromSuperview];
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}
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if (!self.batchingUpdates) [self setNeedsUpdateConstraints];
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}
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#pragma mark Batching
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- (void)performBatchUpdates:(void (^)(void))updates;
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{
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NSParameterAssert(updates);
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self.batchingUpdates = YES;
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updates();
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self.batchingUpdates = NO;
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[self setNeedsUpdateConstraints];
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}
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- (void)addViewController:(UIViewController *)viewController toParent:(UIViewController *)parentViewController withTopMargin:(CGFloat)margin
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{
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[viewController willMoveToParentViewController:parentViewController];
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[parentViewController addChildViewController:viewController];
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[self addSubview:viewController.view withTopMargin:margin];
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[viewController didMoveToParentViewController:parentViewController];
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}
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- (void)addViewController:(UIViewController *)viewController toParent:(UIViewController *)parentViewController withTopMargin:(CGFloat)margin sideMargin:(CGFloat)sideMargin;
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{
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[viewController willMoveToParentViewController:parentViewController];
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[parentViewController addChildViewController:viewController];
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[self addSubview:viewController.view withTopMargin:margin sideMargin:sideMargin];
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[viewController didMoveToParentViewController:parentViewController];
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}
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#pragma mark Helper functions
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- (NSInteger)indexOfView:(UIView *)view
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{
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for (StackView *stackView in self.viewStack) {
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if ([view isEqual:stackView.view]) {
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return [self.viewStack indexOfObject:stackView];
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}
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}
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return NSNotFound;
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}
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- (NSLayoutConstraint *)topConstraintForView:(UIView *)view
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{
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for (StackView *stackView in self.viewStack) {
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if ([view isEqual:stackView.view]) {
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return stackView.topConstraint;
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}
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}
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return nil;
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}
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- (UIView *)lastView
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{
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return [[self.viewStack lastObject] view];
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}
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#pragma mark - Layout Guides
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- (void)setTopLayoutGuide:(id<UILayoutSupport>)topLayoutGuide {
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_topLayoutGuide = topLayoutGuide;
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[self needsUpdateConstraints];
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}
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@end

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