iOS 标签Tag列表的实现代码

前言

1、之前项目中会有一些标签列表来显示某些特性或要求，如下图（代码实现后的效果）:

2、期间也是浏览了好多其他的第三方，但是可能是没找到好的方法去寻找吧，没有找到一个合适的，况且又不是特别复杂的东西，所以就自己写了一套，但是注意因为我们项目中使用的是RAC+Mansory,所以想要使用的话需要引入这两个库=_=。

3、自己写的时候考虑的不是太多，中心思想是ViewModel做定制需求，View通过ViewModel来实现定制化UI，其他更多的是逻辑上的排版，所以不做更多赘述，自己体会Y^o^Y 。

View布局

LSLabelTextView.h的实现

//
// LSLabelTextView.h
// RenCheRen
//
// Created by 王隆帅 on 15/12/30.
// Copyright © 2015年 王隆帅. All rights reserved.
//

#import "YCView.h"

@interface LSLabelTextView : YCView

@end

LSLabelTextView.m的实现

//
// LSLabelTextView.m
// RenCheRen
//
// Created by 王隆帅 on 15/12/30.
// Copyright © 2015年 王隆帅. All rights reserved.
//

#import "LSLabelTextView.h"
#import "LSLabelTextViewModel.h"

@interface LSLabelTextView ()

@property (nonatomic, strong) LSLabelTextViewModel *viewModel;

@end
@implementation LSLabelTextView {

  MASConstraint *_toLeftBtnMasConstraint;
  MASConstraint *_toTopBtnMasonstraint;
  MASConstraint *_toLeftSelfMasConstraint;
  MASConstraint *_toTopSelfMasonstraint;
}

- (instancetype)initWithViewModel:(id<YCViewModelProtocol>)viewModel {

  self.viewModel = (LSLabelTextViewModel *)viewModel;
  return [super initWithViewModel:viewModel];
}

- (void)yc_bindViewModel {

  @weakify(self);
  [[RACObserve(self, viewModel.dataArray) distinctUntilChanged] subscribeNext:^(id x) {

    @strongify(self);

    [self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

    if (self.viewModel.dataArray.count <= 0) {

      __weak UIView *weakNullView;
      UIView *nullView = [[UIView alloc] init];
      weakNullView = nullView;
      [self addSubview:weakNullView];
      WS(weakSelf)
      [weakNullView mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.right.left.bottom.equalTo(weakSelf);
        make.height.equalTo(weakSelf.viewModel.nullHeight);
      }];
      return;
    }

    NSInteger lineNum = 1;
    CGFloat allWidth = 0;
    __weak UIButton *lastBtn;

    for (int i = 0; i < self.viewModel.dataArray.count; i++) {

       NSString *string = [self.viewModel.dataArray stringWithIndex:i];
      __weak UIButton *weakBtn = [self ls_getBtnWithString:string];
      [self addSubview:weakBtn];

      CGSize size = [string widthWithHeight:20 andFont:self.viewModel.textFontNum];

      CGFloat needFloat = size.width < self.viewModel.miniWidth ? self.viewModel.miniWidth : size.width;

      if (lastBtn) {

        WS(weakSelf)
        [weakBtn mas_makeConstraints:^(MASConstraintMaker *make) {

          _toLeftBtnMasConstraint = make.left.equalTo(lastBtn.mas_right).offset(weakSelf.viewModel.labelHorizontalSpace);
          [_toLeftBtnMasConstraint activate];

          _toTopBtnMasonstraint = make.top.equalTo(lastBtn.mas_bottom).offset(weakSelf.viewModel.labelVerticalSpace);
          [_toTopBtnMasonstraint deactivate];

          _toLeftSelfMasConstraint = make.left.equalTo(weakSelf.viewModel.leftToViewEdge);
          _toTopSelfMasonstraint = make.top.equalTo(lastBtn);

          make.size.equalTo(CGSizeMake(needFloat + 20, weakSelf.viewModel.labelHeight));
        }];

        if (allWidth + self.viewModel.labelHorizontalSpace + needFloat + 20 + self.viewModel.rightToViewEdge > self.viewModel.allWidth) {
          [_toLeftSelfMasConstraint activate];
          [_toLeftBtnMasConstraint deactivate];
          [_toTopBtnMasonstraint activate];
          [_toTopSelfMasonstraint deactivate];

          lineNum ++;
          allWidth = self.viewModel.leftToViewEdge + needFloat + 20;
        } else {

          [_toLeftSelfMasConstraint deactivate];
          [_toLeftBtnMasConstraint activate];
          [_toTopBtnMasonstraint deactivate];
          [_toTopSelfMasonstraint activate];

          allWidth = allWidth + self.viewModel.labelHorizontalSpace + needFloat + 20;
        }
      } else {

        WS(weakSelf)
        [weakBtn mas_makeConstraints:^(MASConstraintMaker *make) {

          make.left.equalTo(weakSelf.viewModel.leftToViewEdge);
          make.size.equalTo(CGSizeMake(needFloat + 20, weakSelf.viewModel.labelHeight));
          make.top.equalTo(weakSelf.viewModel.topToViewEdge);
        }];

        allWidth = allWidth + self.viewModel.leftToViewEdge + needFloat + 20;
      }

      lastBtn = weakBtn;
    }

    WS(weakSlef)
    [lastBtn mas_updateConstraints:^(MASConstraintMaker *make) {

      make.bottom.equalTo(weakSlef.viewModel.bottomToViewEdge);
    }];

  }];
}

- (UIButton *)ls_getBtnWithString:(NSString *)string {

  UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
  btn.layer.borderWidth = 0.5;
  btn.layer.borderColor = self.viewModel.borderColor.CGColor;
  [btn setTitleColor:self.viewModel.titleColor forState:UIControlStateNormal];
  btn.backgroundColor = self.viewModel.backgroundColor;
  btn.layer.masksToBounds = YES;
  btn.layer.cornerRadius = self.viewModel.cornerRadius;
  btn.titleLabel.font = YC_YAHEI_FONT(self.viewModel.textFontNum);
  [btn setTitle:string forState:UIControlStateNormal];
  btn.ls_typeString = string;

  return btn;
}

@end

ViewModel适配

LSLabelTextViewModel.h的实现

//
// LSLabelTextViewModel.h
// RenCheRen
//
// Created by 王隆帅 on 15/12/30.
// Copyright © 2015年 王隆帅. All rights reserved.
//

#import "YCViewModel.h"

@interface LSLabelTextViewModel : YCViewModel
/**
 * 标签数组
 */
@property (nonatomic, strong) NSMutableArray *dataArray;
/**
 * 总的宽度
 */
@property (nonatomic, assign) CGFloat allWidth;
/**
 * 没有标签时的高度
 */
@property (nonatomic, assign) CGFloat nullHeight;
/**
 * 文字字体大小
 */
@property (nonatomic, assign) CGFloat textFontNum;
/**
 * 取得标签为空的时候，标签最小长度
 */
@property (nonatomic, assign) CGFloat miniWidth;
/**
 * 标签高度
 */
@property (nonatomic, assign) CGFloat labelHeight;
/**
 * 最左侧标签距离View的边缘的宽度
 */
@property (nonatomic, assign) CGFloat leftToViewEdge;
/**
 * 最右侧标签距离View的边缘的宽度
 */
@property (nonatomic, assign) CGFloat rightToViewEdge;
/**
 * 最上侧标签距离View的边缘的宽度
 */
@property (nonatomic, assign) CGFloat topToViewEdge;
/**
 * 最下侧标签距离View的边缘的宽度
 */
@property (nonatomic, assign) CGFloat bottomToViewEdge;
/**
 * 横向标签之间的宽度
 */
@property (nonatomic, assign) CGFloat labelHorizontalSpace;
/**
 * 纵向标签之间的宽度
 */
@property (nonatomic, assign) CGFloat labelVerticalSpace;
/**
 * label(btn) 的相关属性
 */
@property (nonatomic, assign) CGFloat borderWidth;
@property (nonatomic, strong) UIColor *borderColor;
@property (nonatomic, strong) UIColor *titleColor;
@property (nonatomic, strong) UIColor *backgroundColor;
@property (nonatomic, assign) CGFloat cornerRadius;

@end

LSLabelTextViewModel.m的实现

//
// LSLabelTextViewModel.m
// RenCheRen
//
// Created by 王隆帅 on 15/12/30.
// Copyright © 2015年 王隆帅. All rights reserved.
//

#import "LSLabelTextViewModel.h"

@implementation LSLabelTextViewModel

- (NSMutableArray *)dataArray {

  if (!_dataArray) {

    _dataArray = [[NSMutableArray alloc] init];
  }
  return _dataArray;
}

@end

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