iOS 标签Tag列表的实现代码

//// 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// 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

//// 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// 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