iOS如何实现动态自适应标签

//
// XGTagView.h
// 动态标签
//
// Created by xgao on 17/3/22.
// Copyright © 2017年 xgao. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface XGTagView : UIView

/**
 * 初始化
 *
 * @param frame frame
 * @param tagArray 标签数组
 *
 * @return
 */
- (instancetype)initWithFrame:(CGRect)frame tagArray:(NSMutableArray*)tagArray;

// 标签数组
@property (nonatomic,retain) NSArray* tagArray;

// 选中标签文字颜色
@property (nonatomic,retain) UIColor* textColorSelected;
// 默认标签文字颜色
@property (nonatomic,retain) UIColor* textColorNormal;

// 选中标签背景颜色
@property (nonatomic,retain) UIColor* backgroundColorSelected;
// 默认标签背景颜色
@property (nonatomic,retain) UIColor* backgroundColorNormal;


@end

//
// XGTagView.m
// 动态标签
//
// Created by xgao on 17/3/22.
// Copyright © 2017年 xgao. All rights reserved.
//

#import "XGTagView.h"

@interface XGTagView()

@end

@implementation XGTagView

/**
 * 初始化
 *
 * @param frame frame
 * @param tagArray 标签数组
 *
 * @return
 */
- (instancetype)initWithFrame:(CGRect)frame tagArray:(NSArray*)tagArray{
 
 self = [super initWithFrame:frame];
 if (self) {
 _tagArray = tagArray;
 [self setUp];
 }
 return self;
}

// 初始化
- (void)setUp{
 
 // 默认颜色
 _textColorNormal = [UIColor darkGrayColor];
 _textColorSelected = [UIColor whiteColor];
 _backgroundColorSelected = [UIColor redColor];
 _backgroundColorNormal = [UIColor whiteColor];
 
 // 创建标签按钮
 [self createTagButton];
}

// 重写set属性
- (void)setTagArray:(NSMutableArray *)tagArray{
 
 _tagArray = tagArray;
 
 // 重新创建标签
 [self resetTagButton];
}

- (void)setTextColorSelected:(UIColor *)textColorSelected{

 _textColorSelected = textColorSelected;
 // 重新创建标签
 [self resetTagButton];
}

- (void)setTextColorNormal:(UIColor *)textColorNormal{
 
 _textColorNormal = textColorNormal;
 // 重新创建标签
 [self resetTagButton];
}

- (void)setBackgroundColorSelected:(UIColor *)backgroundColorSelected{
 
 _backgroundColorSelected = backgroundColorSelected;
 // 重新创建标签
 [self resetTagButton];
}

- (void)setBackgroundColorNormal:(UIColor *)backgroundColorNormal{
 
 _backgroundColorNormal = backgroundColorNormal;
 // 重新创建标签
 [self resetTagButton];
}

#pragma mark - Private

// 重新创建标签
- (void)resetTagButton{
 
 // 移除之前的标签
 for (UIButton* btn in self.subviews) {
 [btn removeFromSuperview];
 }
 // 重新创建标签
 [self createTagButton];
}

// 创建标签按钮
- (void)createTagButton{
 
 // 按钮高度
 CGFloat btnH = 28;
 // 距离左边距
 CGFloat leftX = 6;
 // 距离上边距
 CGFloat topY = 10;
 // 按钮左右间隙
 CGFloat marginX = 10;
 // 按钮上下间隙
 CGFloat marginY = 10;
 // 文字左右间隙
 CGFloat fontMargin = 10;
 
 for (int i = 0; i < _tagArray.count; i++) {
 
 UIButton* btn = [UIButton buttonWithType:UIButtonTypeCustom];
 btn.frame = CGRectMake(marginX + leftX, topY, 100, btnH);
 btn.tag = 100+i;
 // 默认选中第一个
 if (i == 0) {
  btn.selected = YES;
 }
 
 // 按钮文字
 [btn setTitle:_tagArray[i] forState:UIControlStateNormal];
 
 //------ 默认样式
 //按钮文字默认样式
 NSMutableAttributedString* btnDefaultAttr = [[NSMutableAttributedString alloc]initWithString:btn.titleLabel.text];
 // 文字大小
 [btnDefaultAttr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:13] range:NSMakeRange(0, btn.titleLabel.text.length)];
 // 默认颜色
 [btnDefaultAttr addAttribute:NSForegroundColorAttributeName value:self.textColorNormal range:NSMakeRange(0, btn.titleLabel.text.length)];
 [btn setAttributedTitle:btnDefaultAttr forState:UIControlStateNormal];
 
 // 默认背景颜色
 [btn setBackgroundImage:[self imageWithColor:self.backgroundColorNormal] forState:UIControlStateNormal];
 
 //----- 选中样式
 // 选中字体颜色
 NSMutableAttributedString* btnSelectedAttr = [[NSMutableAttributedString alloc]initWithString:btn.titleLabel.text];
 // 选中颜色
 [btnSelectedAttr addAttribute:NSForegroundColorAttributeName value:self.textColorSelected range:NSMakeRange(0, btn.titleLabel.text.length)];
 // 选中文字大小
 [btnSelectedAttr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:13] range:NSMakeRange(0, btn.titleLabel.text.length)];
 [btn setAttributedTitle:btnSelectedAttr forState:UIControlStateSelected];
 
 // 选中背景颜色
 [btn setBackgroundImage:[self imageWithColor:self.backgroundColorSelected] forState:UIControlStateSelected];
 
 // 圆角
 btn.layer.cornerRadius = btn.frame.size.height / 2.f;
 btn.layer.masksToBounds = YES;
 // 边框
 btn.layer.borderColor = [UIColor lightGrayColor].CGColor;
 btn.layer.borderWidth = 0.5;
 
 // 设置按钮的边距、间隙
 [self setTagButtonMargin:btn fontMargin:fontMargin];
 
 // 处理换行
 if (btn.frame.origin.x + btn.frame.size.width + marginX > self.frame.size.width) {
  // 换行
  topY += btnH + marginY;
  
  // 重置
  leftX = 6;
  btn.frame = CGRectMake(marginX + leftX, topY, 100, btnH);
  
  // 设置按钮的边距、间隙
  [self setTagButtonMargin:btn fontMargin:fontMargin];
 }
 
 // 重置高度
 CGRect frame = btn.frame;
 frame.size.height = btnH;
 btn.frame = frame;
 
 //----- 选中事件
 [btn addTarget:self action:@selector(selectdButton:) forControlEvents:UIControlEventTouchUpInside];
 
 [self addSubview:btn];
 
 leftX += btn.frame.size.width + marginX;
 }
 
 // 检测按钮状态，最少选中一个
 [self checkButtonState];
}

// 设置按钮的边距、间隙
- (void)setTagButtonMargin:(UIButton*)btn fontMargin:(CGFloat)fontMargin{
 
 // 按钮自适应
 [btn sizeToFit];
 
 // 重新计算按钮文字左右间隙
 CGRect frame = btn.frame;
 frame.size.width += fontMargin*2;
 btn.frame = frame;
}

// 检测按钮状态，最少选中一个
- (void)checkButtonState{
 
 int selectCount = 0;
 UIButton* selectedBtn = nil;
 for(int i=0;i < _tagArray.count; i++){
 UIButton* btn = (UIButton*)[self viewWithTag:100+i];
 if(btn.selected){
  selectCount++;
  selectedBtn = btn;
 }
 }
 if (selectCount == 1) {
 // 只有一个就把这一个给禁用手势
 selectedBtn.userInteractionEnabled = NO;
 }else{
 // 解除禁用手势
 for(int i=0;i < _tagArray.count; i++){
  UIButton* btn = (UIButton*)[self viewWithTag:100+i];
  if(!btn.userInteractionEnabled){
  btn.userInteractionEnabled = YES;
  }
 }
 }
}

// 根据颜色生成UIImage
- (UIImage*)imageWithColor:(UIColor*)color{
 
 CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
 // 开始画图的上下文
 UIGraphicsBeginImageContext(rect.size);
 
 // 设置背景颜色
 [color set];
 // 设置填充区域
 UIRectFill(CGRectMake(0, 0, rect.size.width, rect.size.height));
 
 // 返回UIImage
 UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
 // 结束上下文
 UIGraphicsEndImageContext();
 return image;
}

#pragma mark - Event

// 标签按钮点击事件
- (void)selectdButton:(UIButton*)btn{
 
 btn.selected = !btn.selected;
 
 // 检测按钮状态，最少选中一个
 [self checkButtonState];
}


@end