iOS开发-实现热门话题标签tag显示控件

iOS开发-实现热门话题标签tag显示控件

话题标签tag显示非常常见，如选择你的兴趣，选择关注的群，超话，话题等等。

一、效果图

在这里插入图片描述

二、实现代码

由于显示的是在列表中，这里整体控件是放在UITableViewCell中的。

2.1 标签tag按钮实现

自定义标签tag按钮INRmdTopicButton
INRmdTopicButton.h

@interface INRmdTopicButton : UIControl

@property (nonatomic, strong) NSString *topicName;
@property (nonatomic, assign) CGFloat showTopicWidth;

+ (CGFloat)topicWidth:(NSString *)name;

@end

INRmdTopicButton.m

@interface INRmdTopicButton ()

@property (nonatomic, strong) UIImageView *backImageView;       //图片控件
@property (nonatomic, strong) UIImageView *tbkImageView;       //图片控件
@property (nonatomic, strong) UILabel *titleLabel;

@end

@implementation INRmdTopicButton

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubview:self.backImageView];
        [self.backImageView addSubview:self.tbkImageView];
        [self.backImageView addSubview:self.titleLabel];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    self.backImageView.frame = self.bounds;
    self.tbkImageView.frame = CGRectMake(0.0, 0.0, CGRectGetWidth(self.backImageView.frame), CGRectGetHeight(self.backImageView.frame) - kSmallPadding);
    self.titleLabel.frame = CGRectMake(0.0, 0.0, CGRectGetWidth(self.backImageView.frame), kTopicNameHeight);
}

- (void)setTopicName:(NSString *)topicName {
    _topicName = (topicName?topicName:@"");
    self.titleLabel.text = _topicName;
    [self setNeedsLayout];
}

+ (CGFloat)topicWidth:(NSString *)name {
    CGSize topicSize = [name sizeWithFont:[UIFont systemFontOfSize:12] forMaxSize:CGSizeMake(MAXFLOAT, kTopicHeight)];
    return topicSize.width + 2*kSmallPadding;
}

#pragma mark - SETTER/GETTER
- (UIImageView *)backImageView {
    if (!_backImageView) {
        _backImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _backImageView.userInteractionEnabled = YES;
        _backImageView.backgroundColor = [UIColor clearColor];
    }
    return _backImageView;
}

- (UIImageView *)tbkImageView {
    if (!_tbkImageView) {
        _tbkImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _tbkImageView.userInteractionEnabled = YES;
        _tbkImageView.backgroundColor = [UIColor clearColor];
        UIImage *image = [UIImage imageNamed:@"bk_topic_r"];
        image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width * 0.5) topCapHeight:floorf(image.size.height * 0.5)];
        _tbkImageView.image = image;
    }
    return _tbkImageView;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _titleLabel.font = [UIFont systemFontOfSize:12];
        _titleLabel.textAlignment = NSTextAlignmentCenter;
        _titleLabel.textColor = [UIColor colorWithHexString:@"555555"];
        _titleLabel.backgroundColor = [UIColor clearColor];
    }
    return _titleLabel;
}

@end

2.2 显示排列标签tag

显示标题tag时候，需要排列按钮

INRmdTopicButton *lastButton = nil;
    for (UIView *subView in self.topicBKImageView.subviews) {
        if ([subView isKindOfClass:[INRmdTopicButton class]]) {
            INRmdTopicButton *button = (INRmdTopicButton *)subView;
            button.hidden = NO;
            if (lastButton) {
                if (CGRectGetMaxX(lastButton.frame) + button.showTopicWidth + kSmallPadding > maxWidth) {
                    button.frame = CGRectMake(0.0, CGRectGetMaxY(lastButton.frame), button.showTopicWidth, kTopicHeight);
                } else {
                    button.frame = CGRectMake(CGRectGetMaxX(lastButton.frame) + kSmallPadding, CGRectGetMinY(lastButton.frame), button.showTopicWidth, kTopicHeight);
                }
            } else {
                button.frame = CGRectMake(originX, originY, button.showTopicWidth, kTopicHeight);
            }
            
            if (CGRectGetMaxY(button.frame) > maxHeight) {
                button.hidden = YES;
            } else {
                button.hidden = NO;
            }
            
            lastButton = button;
        }
    }

这里还加了拖动手势UIPanGestureRecognizer，当往左拖动的时候会显示松开换一换的功能。调用接口实现。

#pragma mark - panGestureHandle
- (void)panGestureHandle:(UIPanGestureRecognizer *)pan{
    if (pan.state == UIGestureRecognizerStateBegan) {
        NSLog(@"UIGestureRecognizerStateBegan");
        self.startPoint = [pan translationInView:self];
    } if (pan.state == UIGestureRecognizerStateChanged) {
        NSLog(@"UIGestureRecognizerStateChanged");
        
        CGPoint point = [pan translationInView:self];
        CGFloat xDistance = point.x - self.startPoint.x;
        // 左右滑动
        NSLog(@"左右滑动");
        if (xDistance > 0) {
            NSLog(@"向右滑动");
            CGRect backFrame = self.topicBKImageView.frame;
            backFrame.origin.x = kMidPadding;
            self.topicBKImageView.frame = backFrame;
        } else {
            NSLog(@"向左滑动");
            CGRect backFrame = self.topicBKImageView.frame;
            backFrame.origin.x = kMidPadding + xDistance*0.5;
            self.topicBKImageView.frame = backFrame;
        }
        
    } else {
        // if (pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateCancelled || pan.state == UIGestureRecognizerStateFailed)
        NSLog(@"UIGestureRecognizerStateEnded");
        CGRect backFrame = self.topicBKImageView.frame;
        backFrame.origin.x = kMidPadding;
        [UIView animateWithDuration:0.55 delay:0.0 usingSpringWithDamping:0.5 initialSpringVelocity:7.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            self.topicBKImageView.frame = backFrame;
        } completion:^(BOOL finished) {
            
        }];
    }
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

2.3 完整代码如下

INRecommentTopicCell.h

#import <UIKit/UIKit.h>

@interface INRmdTopicButton : UIControl

@property (nonatomic, strong) NSString *topicName;
@property (nonatomic, assign) CGFloat showTopicWidth;

+ (CGFloat)topicWidth:(NSString *)name;

@end

/**
 推荐的话题
 */
@interface INRecommentTopicCell : UITableViewCell

+ (CGFloat)cellHeight;

@end

INRecommentTopicCell.m

#import "INRecommentTopicCell.h"
#import "UIColor+Addition.h"
#import "NSString+Size.h"

static CGFloat kCellHeight = 260.0;

static CGFloat kCellHorBGPadding = 10.0f;
static CGFloat kCellVerBGPadding = 5.0f;

static CGFloat kTitleHeight = 44.0f;
static CGFloat kMidPadding = 10.0f;

static CGFloat kSmallPadding = 5.0f;
static CGFloat kTopicHeight = 40.0f;
static CGFloat kTopicNameHeight = 30.0f;

static CGFloat kExchangeBtnSize = 40.0f;
static CGFloat kTisWidth = 20.0f;

@interface INRmdTopicButton ()

@property (nonatomic, strong) UIImageView *backImageView;       //图片控件
@property (nonatomic, strong) UIImageView *tbkImageView;       //图片控件
@property (nonatomic, strong) UILabel *titleLabel;

@end

@implementation INRmdTopicButton

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubview:self.backImageView];
        [self.backImageView addSubview:self.tbkImageView];
        [self.backImageView addSubview:self.titleLabel];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    self.backImageView.frame = self.bounds;
    self.tbkImageView.frame = CGRectMake(0.0, 0.0, CGRectGetWidth(self.backImageView.frame), CGRectGetHeight(self.backImageView.frame) - kSmallPadding);
    self.titleLabel.frame = CGRectMake(0.0, 0.0, CGRectGetWidth(self.backImageView.frame), kTopicNameHeight);
}

- (void)setTopicName:(NSString *)topicName {
    _topicName = (topicName?topicName:@"");
    self.titleLabel.text = _topicName;
    [self setNeedsLayout];
}

+ (CGFloat)topicWidth:(NSString *)name {
    CGSize topicSize = [name sizeWithFont:[UIFont systemFontOfSize:12] forMaxSize:CGSizeMake(MAXFLOAT, kTopicHeight)];
    return topicSize.width + 2*kSmallPadding;
}

#pragma mark - SETTER/GETTER
- (UIImageView *)backImageView {
    if (!_backImageView) {
        _backImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _backImageView.userInteractionEnabled = YES;
        _backImageView.backgroundColor = [UIColor clearColor];
    }
    return _backImageView;
}

- (UIImageView *)tbkImageView {
    if (!_tbkImageView) {
        _tbkImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _tbkImageView.userInteractionEnabled = YES;
        _tbkImageView.backgroundColor = [UIColor clearColor];
        UIImage *image = [UIImage imageNamed:@"bk_topic_r"];
        image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width * 0.5) topCapHeight:floorf(image.size.height * 0.5)];
        _tbkImageView.image = image;
    }
    return _tbkImageView;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _titleLabel.font = [UIFont systemFontOfSize:12];
        _titleLabel.textAlignment = NSTextAlignmentCenter;
        _titleLabel.textColor = [UIColor colorWithHexString:@"555555"];
        _titleLabel.backgroundColor = [UIColor clearColor];
    }
    return _titleLabel;
}

@end

/**
 推荐的话题
 */
@interface INRecommentTopicCell ()

@property (nonatomic, strong) UIImageView *backImageView;       //图片控件
@property (nonatomic, strong) UIImageView *contentBGImageView;       //图片控件
@property (nonatomic, strong) UIImageView *topicBKImageView;       //图片控件
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UIButton *exchangeButton;     // 更多

@property (nonatomic, strong) UILabel *tipsLabel;

@property (nonatomic) CGPoint startPoint;     // 开始点

@end

@implementation INRecommentTopicCell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
        
        self.backgroundColor = [UIColor clearColor];
        self.contentView.backgroundColor = [UIColor clearColor];
        [self.contentView addSubview:self.backImageView];
        [self.contentView addSubview:self.contentBGImageView];
        [self.contentBGImageView addSubview:self.titleLabel];
        [self.contentBGImageView addSubview:self.exchangeButton];
        [self.contentBGImageView addSubview:self.tipsLabel];
        [self.contentBGImageView addSubview:self.topicBKImageView];

        [self setupRmdTopicViews];
        
        UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGestureHandle:)];
        panGesture.minimumNumberOfTouches = 1;
        panGesture.maximumNumberOfTouches = 1;
        panGesture.delegate = self;
        [self.contentBGImageView addGestureRecognizer:panGesture];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    self.backImageView.frame = CGRectMake(kCellHorBGPadding, kCellVerBGPadding, CGRectGetWidth(self.bounds) - 2*kCellHorBGPadding, CGRectGetHeight(self.bounds) - 2*kCellVerBGPadding);
    
    self.contentBGImageView.frame = CGRectMake(kCellHorBGPadding, kCellVerBGPadding, CGRectGetWidth(self.bounds) - 2*kCellHorBGPadding, CGRectGetHeight(self.bounds) - 2*kCellVerBGPadding);

    self.titleLabel.frame = CGRectMake(kMidPadding, 0.0, CGRectGetWidth(self.backImageView.frame) - 3*kMidPadding - kExchangeBtnSize, kTitleHeight);
    
    self.exchangeButton.frame = CGRectMake(CGRectGetWidth(self.backImageView.frame) - kMidPadding - kExchangeBtnSize, (kTitleHeight - kExchangeBtnSize)/2, kExchangeBtnSize, kExchangeBtnSize);
    
    CGFloat height = CGRectGetHeight(self.backImageView.frame) - CGRectGetMaxY(self.titleLabel.frame);
    self.tipsLabel.frame = CGRectMake(CGRectGetWidth(self.backImageView.frame) - kMidPadding - kTisWidth, 0.0, kTisWidth, height);
    
    self.topicBKImageView.frame = CGRectMake(kMidPadding, CGRectGetMaxY(self.titleLabel.frame), CGRectGetWidth(self.backImageView.frame) - 2*kMidPadding, height);
    
    CGFloat maxWidth = CGRectGetWidth(self.topicBKImageView.frame);
    CGFloat maxHeight = CGRectGetHeight(self.topicBKImageView.frame);
    
    CGFloat originX = 0.0;
    CGFloat originY = 0.0;

    INRmdTopicButton *lastButton = nil;
    for (UIView *subView in self.topicBKImageView.subviews) {
        if ([subView isKindOfClass:[INRmdTopicButton class]]) {
            INRmdTopicButton *button = (INRmdTopicButton *)subView;
            button.hidden = NO;
            if (lastButton) {
                if (CGRectGetMaxX(lastButton.frame) + button.showTopicWidth + kSmallPadding > maxWidth) {
                    button.frame = CGRectMake(0.0, CGRectGetMaxY(lastButton.frame), button.showTopicWidth, kTopicHeight);
                } else {
                    button.frame = CGRectMake(CGRectGetMaxX(lastButton.frame) + kSmallPadding, CGRectGetMinY(lastButton.frame), button.showTopicWidth, kTopicHeight);
                }
            } else {
                button.frame = CGRectMake(originX, originY, button.showTopicWidth, kTopicHeight);
            }
            
            if (CGRectGetMaxY(button.frame) > maxHeight) {
                button.hidden = YES;
            } else {
                button.hidden = NO;
            }
            
            lastButton = button;
        }
    }
}

- (void)setupRmdTopicViews {
    for (UIView *subView in self.topicBKImageView.subviews) {
        if ([subView isKindOfClass:[INRmdTopicButton class]]) {
            [subView removeFromSuperview];
        }
    }
    
    for (NSInteger index = 0; index < 15; index ++) {
        INRmdTopicButton *button = [[INRmdTopicButton alloc] initWithFrame:CGRectZero];
        button.tag = index;
        [self.topicBKImageView addSubview:button];
        
        if (index % 5 == 0) {
            button.topicName = @"#读书交流";
        } else if (index % 5 == 1) {
            button.topicName = @"#爱手工生活";
        } else if (index % 5 == 2) {
            button.topicName = @"#精致的佛系生活";
        } else if (index % 5 == 3) {
            button.topicName = @"#数码发烧友";
        } else if (index % 5 == 4) {
            button.topicName = @"#晒晒你的心情";
        } else {
            button.topicName = @"#说说身边事";
        }
        button.showTopicWidth = [INRmdTopicButton topicWidth:button.topicName];
    }
    
    [self setNeedsLayout];
}


- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

+ (CGFloat)cellHeight {
    return kCellHeight;
}

#pragma mark - Actions
- (void)exchangeButtonAction {
    
}

#pragma mark - SETTER/GETTER
- (UIImageView *)backImageView {
    if (!_backImageView) {
        _backImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _backImageView.userInteractionEnabled = YES;
        _backImageView.backgroundColor = [UIColor whiteColor];
        _backImageView.layer.cornerRadius = 2.0;
        _backImageView.layer.shadowColor = [UIColor colorWithHexString:@"9bb9ef"].CGColor;
        _backImageView.layer.shadowOffset = CGSizeMake(0, 3);
        _backImageView.layer.shadowOpacity = 0.3;
        _backImageView.layer.shadowRadius = 3.0;
    }
    return _backImageView;
}

- (UIImageView *)contentBGImageView {
    if (!_contentBGImageView) {
        _contentBGImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _contentBGImageView.userInteractionEnabled = YES;
        _contentBGImageView.backgroundColor = [UIColor whiteColor];
        _contentBGImageView.layer.cornerRadius = 2.0;
        _contentBGImageView.layer.masksToBounds = YES;
        _contentBGImageView.clipsToBounds = YES;
    }
    return _contentBGImageView;
}

- (UIImageView *)topicBKImageView {
    if (!_topicBKImageView) {
        _topicBKImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        _topicBKImageView.userInteractionEnabled = YES;
        _topicBKImageView.backgroundColor = [UIColor whiteColor];
        _topicBKImageView.clipsToBounds = YES;
    }
    return _topicBKImageView;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _titleLabel.font = [UIFont systemFontOfSize:18];
        _titleLabel.textColor = [UIColor colorWithHexString:@"131619"];
        _titleLabel.backgroundColor = [UIColor clearColor];
        _titleLabel.text = @"热门话题";
    }
    return _titleLabel;
}

- (UILabel *)tipsLabel {
    if (!_tipsLabel) {
        _tipsLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _tipsLabel.font = [UIFont systemFontOfSize:12];
        _tipsLabel.textColor = [UIColor colorWithHexString:@"9a9b9c"];
        _tipsLabel.backgroundColor = [UIColor clearColor];
        _tipsLabel.numberOfLines = 0;
        _tipsLabel.textAlignment = NSTextAlignmentCenter;
        _tipsLabel.text = @"松\n开\n换\n一\n换";
    }
    return _tipsLabel;
}

- (UIButton *)exchangeButton {
    if (!_exchangeButton) {
        _exchangeButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_exchangeButton setImage:[UIImage imageNamed:@"ic_topic_exchange"] forState:UIControlStateNormal];
        [_exchangeButton addTarget:self action:@selector(exchangeButtonAction) forControlEvents:UIControlEventTouchUpInside];
    }
    return _exchangeButton;
}

#pragma mark - panGestureHandle
- (void)panGestureHandle:(UIPanGestureRecognizer *)pan{
    if (pan.state == UIGestureRecognizerStateBegan) {
        NSLog(@"UIGestureRecognizerStateBegan");
        self.startPoint = [pan translationInView:self];
    } if (pan.state == UIGestureRecognizerStateChanged) {
        NSLog(@"UIGestureRecognizerStateChanged");
        
        CGPoint point = [pan translationInView:self];
        CGFloat xDistance = point.x - self.startPoint.x;
        // 左右滑动
        NSLog(@"左右滑动");
        if (xDistance > 0) {
            NSLog(@"向右滑动");
            CGRect backFrame = self.topicBKImageView.frame;
            backFrame.origin.x = kMidPadding;
            self.topicBKImageView.frame = backFrame;
        } else {
            NSLog(@"向左滑动");
            CGRect backFrame = self.topicBKImageView.frame;
            backFrame.origin.x = kMidPadding + xDistance*0.5;
            self.topicBKImageView.frame = backFrame;
        }
        
    } else {
        // if (pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateCancelled || pan.state == UIGestureRecognizerStateFailed)
        NSLog(@"UIGestureRecognizerStateEnded");
        CGRect backFrame = self.topicBKImageView.frame;
        backFrame.origin.x = kMidPadding;
        [UIView animateWithDuration:0.55 delay:0.0 usingSpringWithDamping:0.5 initialSpringVelocity:7.0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            self.topicBKImageView.frame = backFrame;
        } completion:^(BOOL finished) {
            
        }];
    }
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

@end

三、小结

iOS开发-实现热门话题标签tag显示控件
话题标签tag显示非常常见，如选择你的兴趣，选择关注的群，超话，话题等等。

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