UILabel标签，动态排列

效果图.png

//  TagsLabelFrame.h
//  BNYTExpert
//
//  Created by 贾倍 on 2018/3/24.
//  Copyright © 2018年 贾倍. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

#define TagsTitleFont [UIFont systemFontOfSize:13]

@interface TagsLabelFrame : NSObject

/**
 标签数组
 */
@property(nonatomic,strong)NSArray *tagsArray;

/**
 标签数组frame
 */
@property(nonatomic,strong)NSMutableArray *tagsFrames;

/**
 全部标签高度
 */
@property(nonatomic,assign)CGFloat tagsHeight;

/**
 标签间距 默认10
 */
@property(nonatomic,assign)CGFloat tagsMargin;

/**
 标签行间距 默认10
 */
@property(nonatomic,assign)CGFloat tagsLineSpacing;

/**
 标签最新内边距 默认10
 */
@property(nonatomic,assign)CGFloat tagsMinPadding;

@end

TagsLabelFrame.m

//  TagsLabelFrame.m
//  BNYTExpert
//
//  Created by 贾倍 on 2018/3/24.
//  Copyright © 2018年 贾倍. All rights reserved.
//

#import "TagsLabelFrame.h"

@implementation TagsLabelFrame

//初始化
-(id)init {
    self = [super init];
    if (self) {
        _tagsFrames = [NSMutableArray array];
        _tagsMinPadding  = 10;
        _tagsMargin      = 10;
        _tagsLineSpacing = 10;
    }
    return self;
}

-(void)setTagsArray:(NSArray *)tagsArray{
    _tagsArray = tagsArray;
    
    CGFloat btnX  = _tagsMargin;
    CGFloat btnW  = 0;
    CGFloat nextW = 0;//下一个标签的宽度
    CGFloat moreW = 0;//每一行多出来的宽度
    
    //每一行的最后一个tag的索引的数组和每一行多出来的宽度的数组
    NSMutableArray *lastIndexs = [NSMutableArray array];
    NSMutableArray *moreWidths = [NSMutableArray array];
    
    for (NSInteger i = 0; i<tagsArray.count; i++) {
        btnW = [self sizeWithText:tagsArray[i] font:TagsTitleFont].width + _tagsMinPadding *2;
        if (i < tagsArray.count - 1) {
            nextW = [self sizeWithText:tagsArray[i+1] font:TagsTitleFont].width + _tagsMinPadding * 2;
        }
        CGFloat nextBtnX = btnX + btnW + _tagsMargin;
        //如果下一个按钮，标签最右侧则换行
        if ((nextBtnX + nextW) > (SCREEN_WIDTH - _tagsMargin)) {
            //计算超过的宽度
            moreW = SCREEN_WIDTH - nextBtnX;
            [lastIndexs addObject:[NSNumber numberWithInteger:i]];
            [moreWidths addObject:[NSNumber numberWithInteger:i]];
            btnX = _tagsMargin;
        } else {
            btnX += (btnW + _tagsMargin);
        }
        //如果是最后一个且数组中没有，则吧最后一个加入数组
        if (i == tagsArray.count - 1) {
            if (![lastIndexs containsObject:[NSNumber numberWithInteger:i]]) {
                [lastIndexs addObject:[NSNumber numberWithInteger:i]];
                [moreWidths addObject:[NSNumber numberWithFloat:0]];
            }
        }
    }
    NSInteger location = 0;//截取的位置
    NSInteger length   = 0;//截取的长度
    CGFloat averageW   = 0;//多出来的平均宽度
    CGFloat tagW       = 0;
    CGFloat tagH       = 30;
    
    for (NSInteger i = 0; i < lastIndexs.count; i++) {
        NSInteger lastIndex = [lastIndexs[i] integerValue];
        if (i == 0) {
            length = lastIndex + 1;
        } else {
            length = [lastIndexs[i] integerValue] - [lastIndexs[i - 1] integerValue];
        }
        //从数组中截取每一行的数组
        NSArray *newArr = [tagsArray subarrayWithRange:NSMakeRange(location, length)];
        location = lastIndex + 1;
        averageW = [moreWidths[i] floatValue]/newArr.count;
        CGFloat tagX = _tagsMargin;
        CGFloat tagY = _tagsLineSpacing + (_tagsLineSpacing + tagH) *i;
        
        for (NSInteger j = 0; j < newArr.count; j++) {
            tagW = [self sizeWithText:newArr[j] font:TagsTitleFont].width + _tagsMinPadding *2 + averageW;
            CGRect btnF = CGRectMake(tagX, tagY, tagW, tagH);
            [_tagsFrames addObject:NSStringFromCGRect(btnF)];
            tagX += (tagW + _tagsMargin);
        }
    }
    _tagsHeight = (tagH + _tagsLineSpacing) * lastIndexs.count + _tagsLineSpacing;
}


/**
 单行文本数据获取宽高

 @param text 文本
 @param font 字体
 @return 宽高
 */
-(CGSize)sizeWithText:(NSString *)text font:(UIFont *)font{
    NSDictionary *attrs = @{NSFontAttributeName:font};
    return [text sizeWithAttributes:attrs];
}

@end

使用：

1.引入头文件，以及定义变量

1.png

2.初始化

2.png

3.png