iOS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