TTGTagCollectionView

What

TTGTagCollectionView is useful for showing different size tag views in a vertical or horizontal scrollable view. And if you only want to show text tags, you can use TTGTextTagCollectionView instead, which has more simple api. At the same time, It is highly customizable that many features of the text tag can be configured, like the tag font size and the background color.

Features

Both text tag and custom view tag supported.
Highly customizable, each text tag can be configured.
Vertical and horizontal scrollable.
Support different kinds of alignment types.
Support specifying number of lines.
Support Autolayout intrinsicContentSize to auto determine height based on content size.
Support pull to refresh, like SVPullToRefresh.
Use preferredMaxLayoutWidth to set available width like UIlabel.

Demo

You can find demos in the Example->TTGTagCollectionView.xcworkspace project.

Requirements

iOS 7 and later.

Installation

CocoaPods

TTGTagCollectionView is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "TTGTagCollectionView"

Carthage

You can use Carthage to install TTGTagCollectionView by adding it to your Cartfile:

github "zekunyan/TTGTagCollectionView"

Usage

TTGTextTagCollectionView

Use TTGTextTagCollectionView to show text tags.

Basic usage

TTGTextTagCollectionView *tagCollectionView = [[TTGTextTagCollectionView alloc] initWithFrame:CGRectMake(20, 20, 200, 200)];
[self.view addSubview:tagCollectionView];
[tagCollectionView addTags:@[@"TTG", @"Tag", @"collection", @"view"]];

Delegate

Conform the TTGTextTagCollectionViewDelegate protocol to get callback when you select the tag or content height changes.

@protocol TTGTextTagCollectionViewDelegate <NSObject>
@optional
- (BOOL)textTagCollectionView:(TTGTextTagCollectionView *)textTagCollectionView
                    canTapTag:(NSString *)tagText
                      atIndex:(NSUInteger)index
              currentSelected:(BOOL)currentSelected
                    tagConfig:(TTGTextTagConfig *)config;

- (void)textTagCollectionView:(TTGTextTagCollectionView *)textTagCollectionView
                    didTapTag:(NSString *)tagText
                      atIndex:(NSUInteger)index
                     selected:(BOOL)selected
                    tagConfig:(TTGTextTagConfig *)config;

- (void)textTagCollectionView:(TTGTextTagCollectionView *)textTagCollectionView
            updateContentSize:(CGSize)contentSize;
@end

Customization

Each tag can be configured.

@interface TTGTextTagConfig : NSObject
// Text font
@property (strong, nonatomic) UIFont *tagTextFont;

// Text color
@property (strong, nonatomic) UIColor *tagTextColor;
@property (strong, nonatomic) UIColor *tagSelectedTextColor;

// Background color
@property (strong, nonatomic) UIColor *tagBackgroundColor;
@property (strong, nonatomic) UIColor *tagSelectedBackgroundColor;

// Gradient background color
@property (assign, nonatomic) BOOL tagShouldUseGradientBackgrounds; // Default is `NO`. If set, solid background colors are ignored.
@property (strong, nonatomic) UIColor *tagGradientBackgroundStartColor;
@property (strong, nonatomic) UIColor *tagGradientBackgroundEndColor;
@property (strong, nonatomic) UIColor *tagSelectedGradientBackgroundStartColor;
@property (strong, nonatomic) UIColor *tagSelectedGradientBackgroundEndColor;
@property (assign, nonatomic) CGPoint tagGradientStartPoint; // Default is `(0.5, 0)`.
@property (assign, nonatomic) CGPoint tagGradientEndPoint; // Default is `(0.5, 1)`.

// Corner radius
@property (assign, nonatomic) CGFloat tagCornerRadius;
@property (assign, nonatomic) CGFloat tagSelectedCornerRadius;

// Border
@property (assign, nonatomic) CGFloat tagBorderWidth;
@property (assign, nonatomic) CGFloat tagSelectedBorderWidth;
@property (strong, nonatomic) UIColor *tagBorderColor;
@property (strong, nonatomic) UIColor *tagSelectedBorderColor;

// Tag shadow.
@property (nonatomic, copy) UIColor *tagShadowColor;    // Default is [UIColor black]
@property (nonatomic, assign) CGSize tagShadowOffset;   // Default is (2, 2)
@property (nonatomic, assign) CGFloat tagShadowRadius;  // Default is 2f
@property (nonatomic, assign) CGFloat tagShadowOpacity; // Default is 0.3f

// Tag extra space in width and height, will expand each tag's size
@property (assign, nonatomic) CGSize tagExtraSpace;
// Tag max width for a text tag. 0 and below means no max width.
@property (assign, nonatomic) CGFloat tagMaxWidth;
// Tag min width for a text tag. 0 and below means no min width.
@property (assign, nonatomic) CGFloat tagMinWidth;

// Extra data. You can use this to bind any object you want to each tag.
@property (nonatomic, strong) NSObject *extraData;
@end

You can also configure scroll direction, alignment, lines limit, spacing and inset.

// Define if the tag can be selected.
@property (assign, nonatomic) BOOL enableTagSelection;

// Tags scroll direction, default is vertical.
@property (nonatomic, assign) TTGTagCollectionScrollDirection scrollDirection;

// Tags layout alignment, default is left.
@property (nonatomic, assign) TTGTagCollectionAlignment alignment;

// Number of lines. 0 means no limit, default is 0 for vertical and 1 for horizontal.
@property (nonatomic, assign) NSUInteger numberOfLines;

// Tag selection limit, default is 0, means no limit
@property (nonatomic, assign) NSUInteger selectionLimit;

// Horizontal and vertical space between tags, default is 4.
@property (assign, nonatomic) CGFloat horizontalSpacing;
@property (assign, nonatomic) CGFloat verticalSpacing;

// Content inset, default is UIEdgeInsetsMake(2, 2, 2, 2).
@property (nonatomic, assign) UIEdgeInsets contentInset;

// The true tags content size, readonly
@property (nonatomic, assign, readonly) CGSize contentSize;

// Manual content height
// Default = NO, set will update content
@property (nonatomic, assign) BOOL manualCalculateHeight;
// Default = 0, set will update content
@property (nonatomic, assign) CGFloat preferredMaxLayoutWidth;

// Scroll indicator
@property (nonatomic, assign) BOOL showsHorizontalScrollIndicator;
@property (nonatomic, assign) BOOL showsVerticalScrollIndicator;

Alignment types:

typedef NS_ENUM(NSInteger, TTGTagCollectionAlignment) {
    TTGTagCollectionAlignmentLeft = 0,                           // Default
    TTGTagCollectionAlignmentCenter,                             // Center
    TTGTagCollectionAlignmentRight,                              // Right
    TTGTagCollectionAlignmentFillByExpandingSpace,               // Expand horizontal spacing and fill
    TTGTagCollectionAlignmentFillByExpandingWidth,               // Expand width and fill
    TTGTagCollectionAlignmentFillByExpandingWidthExceptLastLine, // Expand width and fill, except last line
};

Config tags

Add tag.

// Add tag with detalt config
- (void)addTag:(NSString *)tag;
- (void)addTags:(NSArray <NSString *> *)tags;

// Add tag with custom config
- (void)addTag:(NSString *)tag withConfig:(TTGTextTagConfig *)config;
- (void)addTags:(NSArray <NSString *> *)tags withConfig:(TTGTextTagConfig *)config;

Insert tag.

// Insert tag with default config
- (void)insertTag:(NSString *)tag atIndex:(NSUInteger)index;
- (void)insertTags:(NSArray <NSString *> *)tags atIndex:(NSUInteger)index;

// Insert tag with custom config
- (void)insertTag:(NSString *)tag atIndex:(NSUInteger)index withConfig:(TTGTextTagConfig *)config;
- (void)insertTags:(NSArray <NSString *> *)tags atIndex:(NSUInteger)index withConfig:(TTGTextTagConfig *)config;

Remove tag.

// Remove tag
- (void)removeTag:(NSString *)tag;
- (void)removeTagAtIndex:(NSUInteger)index;
- (void)removeAllTags;

Config tag selection

- (void)setTagAtIndex:(NSUInteger)index selected:(BOOL)selected;

Update tag style config

// Update tag config
- (void)setTagAtIndex:(NSUInteger)index withConfig:(TTGTextTagConfig *)config;
- (void)setTagsInRange:(NSRange)range withConfig:(TTGTextTagConfig *)config;

Get tag information

// Get tag
- (NSString *)getTagAtIndex:(NSUInteger)index;
- (NSArray <NSString *> *)getTagsInRange:(NSRange)range;

// Get tag config
- (TTGTextTagConfig *)getConfigAtIndex:(NSUInteger)index;
- (NSArray <TTGTextTagConfig *> *)getConfigsInRange:(NSRange)range;

// Get all
- (NSArray <NSString *> *)allTags;
- (NSArray <NSString *> *)allSelectedTags;
- (NSArray <NSString *> *)allNotSelectedTags;

Reload

You can reload tags programmatically.

- (void)reload;

Index at point

Returns the index of the tag located at the specified point.

- (NSInteger)indexOfTagAt:(CGPoint)point;