iOS替换指定文字为图片

example:"i说i想精品课"，替换其中的字母‘i’为图片。

效果如下：

• 具体步骤：

一、导入#import <YYKit.h>

利用CocoaPods 'pod 'YYKit''

二、寻找指定文字的位置

//  查找子字符串在父字符串的所有位置
- (NSMutableArray *)getRangeStr:(NSString *)text findText:(NSString *)findText {
    NSMutableArray *arrayRanges = [NSMutableArray arrayWithCapacity:20];
    if (findText == nil && [findText isEqualToString:@""]) {
        return nil;
    }
    NSRange rang = [text rangeOfString:findText]; //获取第一次出现的range
    if (rang.location != NSNotFound && rang.length != 0) {
        [arrayRanges addObject:[NSNumber numberWithInteger:rang.location]];//将第一次的加入到数组中
        NSRange rang1 = {0,0};
        NSInteger location = 0;
        NSInteger length = 0;
        for (int i = 0;; i++) {
            if (0 == i) {//去掉这个xxx
                location = rang.location + rang.length;
                length = text.length - rang.location - rang.length;
                rang1 = NSMakeRange(location, length);
            } else {
                location = rang1.location + rang1.length;
                length = text.length - rang1.location - rang1.length;
                rang1 = NSMakeRange(location, length);
            }
            // 在一个range范围内查找另一个字符串的range
            rang1 = [text rangeOfString:findText options:NSCaseInsensitiveSearch range:rang1];
            if (rang1.location == NSNotFound && rang1.length == 0) {
                break;
            } else { //添加符合条件的location进数组
                [arrayRanges addObject:[NSNumber numberWithInteger:rang1.location]];
            }
        }
        return arrayRanges;
    }
    return nil;
}

三、替换文字为图片

if ([dataModel.title containsString:@"i"]) {
        NSString *titleString = dataModel.title;
        NSMutableAttributedString *alertAttributedString = [[NSMutableAttributedString alloc] initWithString:titleString];
        // 图片
        NSMutableArray *iArray = [self getRangeStr:dataModel.title findText:@"i"];
        for (NSNumber *location in iArray) {
            NSInteger subLocation = [location integerValue];
            YYAnimatedImageView *insertImageView = [[YYAnimatedImageView alloc] initWithImage:[UIImage imageNamed:@"lesson_home_list_i"]];
            insertImageView.frame = CGRectMake(0, 20, 7, 7*48/18);
            NSMutableAttributedString *imageText= [NSMutableAttributedString attachmentStringWithContent:insertImageView contentMode:UIViewContentModeScaleAspectFit attachmentSize:CGSizeMake(14, 7*48/18) alignToFont:KBoldFont(20) alignment:YYTextVerticalAlignmentCenter]; // 图片转化为特殊字符
            [alertAttributedString replaceCharactersInRange:NSMakeRange(subLocation, 1) withAttributedString:imageText];
        }
        [alertAttributedString addAttributes:@{NSFontAttributeName:KBoldFont(20),
                                               NSForegroundColorAttributeName:[UIColor hexStringToColor:@"1c1c1c"]} range:NSMakeRange(0, alertAttributedString.length)];
        self.titleLabel.attributedText = alertAttributedString;
    } else {
        self.titleLabel.text = dataModel.title;
    }