实现效果展示:
URL处理.gif
1.自定义Label,使用TextKit接管
示例代码:
.h 这里声明的协议是用来控制器做超链接跳转等操作的
#import <UIKit/UIKit.h>
@class JSTextLabel;
@protocol JSTextLabelDelegate <NSObject>
@optional
- (void)textLabel:(JSTextLabel *)textLabel withClickTextStorageString:(NSString *)string;
@end
@interface JSTextLabel : UILabel
@property (nonatomic,weak) id <JSTextLabelDelegate> delegate;
@end
.m
//
// JSTextLabel.m
// Weibo_Object-C
//
// Created by ShenYj on 2016/11/25.
// Copyright © 2016年 ___ShenYJ___. All rights reserved.
//
#import "JSTextLabel.h"
@interface JSTextLabel ()
/** 属性文本存储 NSMutableAttributeString的子类(里面存的是要管理的文本) */
@property (nonatomic,strong) NSTextStorage *textStorage;
/** 负责文本'字形'布局(管理文本布局方式) */
@property (nonatomic,strong) NSLayoutManager *textLayoutManager;
/** 负责文本绘制的范围(表示文本要填充的区域) */
@property (nonatomic,strong) NSTextContainer *textLayoutContainer;
@end
@implementation JSTextLabel
- (instancetype)init {
self = [super init];
if (self) {
[self prepareTextSystem];
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
// 指定绘制文本区域
self.textLayoutContainer.size = self.bounds.size;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
// 获取点击的点
CGPoint locationPoint = [touches.anyObject locationInView:self];
// 获取当前点击字符的索引
NSUInteger index = [self.textLayoutManager glyphIndexForPoint:locationPoint inTextContainer:self.textLayoutContainer];
// 判断点击字符索引是否在存放URLRange的数组内
for (NSValue *value in [self getUrlsRanges]) {
NSRange range = value.rangeValue;
BOOL isInURLRange = NSLocationInRange(index, range);
if (isInURLRange) {
// 高亮处理
[self.textStorage addAttribute:NSForegroundColorAttributeName value:[UIColor purpleColor] range:range];
// 重绘
[self setNeedsDisplay];
// 点击range内包含的完整URL
NSString *string = [self.textStorage.string substringWithRange:range];
if ([self.delegate respondsToSelector:@selector(textLabel:withClickTextStorageString:)]) {
[self.delegate textLabel:self withClickTextStorageString:string];
}
}
}
}
- (void)setText:(NSString *)text {
[super setText:text];
[self prepareTextContent];
}
- (void)setAttributedText:(NSAttributedString *)attributedText {
[super setAttributedText:attributedText];
[self prepareTextContent];
}
- (void)setFont:(UIFont *)font {
[super setFont:font];
[self prepareTextContent];
}
- (void)setTextColor:(UIColor *)textColor {
[super setTextColor:textColor];
[self prepareTextContent];
}
/** 重写绘制文本方法 */
- (void)drawTextInRect:(CGRect)rect {
//[super drawTextInRect:rect];
NSRange range = NSMakeRange(0, self.textStorage.length);
// 绘制背景 在iOS中绘制工作是类似于油画似的,后悔值的内容,会把之前绘制的内容覆盖,所以需要先绘制背景,再绘制字形
// ps: 当然如果想要先绘制字形,再绘制背景,可以通过设置背景色的透明度来实现,但是因为涉及到透明度,图层混合模式计算,效率较低,消耗性能
[self.textLayoutManager drawBackgroundForGlyphRange:range atPoint:CGPointZero];
// Glyphs字形
[self.textLayoutManager drawGlyphsForGlyphRange:range atPoint:CGPointZero];
}
/** 准备文本系统 */
- (void)prepareTextSystem {
// 打开交互 (Label默认不能交互)
self.userInteractionEnabled = YES;
// 准备文本内容
// 调用顺序: init --> 设置属性(text/attributeText),所以初始化调用prepareTextContent时,attributeText和text均为nil
// 重写text和attributedText属性中,需要重新准备文本内容
[self prepareTextContent];
// 设置对象的关系
[self.textStorage addLayoutManager:self.textLayoutManager];
[self.textLayoutManager addTextContainer:self.textLayoutContainer];
}
/** 正则表达式匹配URL */
- (NSArray <NSValue *>*)getUrlsRanges {
// 正则表达式
//@"@[\\u4e00-\\u9fa5a-zA-Z0-9_-]*" -> @
NSString *pattern = @"[a-zA-Z]*://[a-zA-Z0-9/\\.]*";
// 多重匹配
NSRegularExpression *regularExpression = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:NULL];
NSMutableArray *rangeArr = [NSMutableArray array];
NSArray<NSTextCheckingResult *> *matchResults = [regularExpression matchesInString:self.textStorage.string options:0 range:NSMakeRange(0, self.textStorage.length)];
// 遍历数组,生成Range的数组
for (NSTextCheckingResult *textCheckingResult in matchResults) {
[rangeArr addObject:[NSValue valueWithRange:textCheckingResult.range]];
}
return rangeArr.copy;
}
/** 准备文本内容 */
- (void)prepareTextContent {
if (self.attributedText.length) {
[self.textStorage setAttributedString:self.attributedText];
} else if (self.text.length) {
[self.textStorage setAttributedString:[[NSAttributedString alloc] initWithString:self.text]];
} else {
[self.textStorage setAttributedString:[[NSAttributedString alloc] init]];
}
// 遍历Range数组 设置URL文字的属性
for (NSValue *value in [self getUrlsRanges]) {
NSRange range = value.rangeValue;
[self.textStorage addAttributes:@{
NSForegroundColorAttributeName : [UIColor redColor],
NSBackgroundColorAttributeName : [UIColor colorWithWhite:0.9 alpha:1.0]
}
range:range];
}
}
#pragma mark
#pragma mark - Lazy
- (NSTextStorage *)textStorage {
if (!_textStorage) {
_textStorage = [[NSTextStorage alloc] init];
}
return _textStorage;
}
- (NSLayoutManager *)textLayoutManager {
if (!_textLayoutManager) {
_textLayoutManager = [[NSLayoutManager alloc] init];
}
return _textLayoutManager;
}
- (NSTextContainer *)textLayoutContainer {
if (!_textLayoutContainer) {
_textLayoutContainer = [[NSTextContainer alloc] init];
}
return _textLayoutContainer;
}
@end
2.控制器使用展示:
#import "ViewController.h"
#import <SafariServices/SafariServices.h>
#import "JSTextLabel.h"
@interface ViewController () <JSTextLabelDelegate>
@property (nonatomic,strong) JSTextLabel *textLabel;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.textLabel];
}
#pragma mark
#pragma mark - JSTextLabelDelegate
- (void)textLabel:(JSTextLabel *)textLabel withClickTextStorageString:(NSString *)string {
SFSafariViewController *sfViewController = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:string]];
[self presentViewController:sfViewController animated:YES completion:^{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self dismissViewControllerAnimated:YES completion:nil];
});
}];
}
#pragma mark
#pragma mark - Lazy
- (JSTextLabel *)textLabel {
if (!_textLabel) {
_textLabel = [[JSTextLabel alloc] init];
_textLabel.delegate = self;
_textLabel.frame = CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, 100);
_textLabel.text = @"苹果官方网站:http://www.apple.com,使劲戳";
_textLabel.backgroundColor = [UIColor orangeColor];
}
return _textLabel;
}
@end
