1.简单设置带属性的字符串

定义一个NSMutableAttributedString带属性的字符串

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"hello[1_1] world![哈哈][微笑]"];

设置属性

[str setAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:60], NSForegroundColorAttributeName:[UIColor redColor], NSBackgroundColorAttributeName:[UIColor greenColor], NSUnderlineColorAttributeName:[UIColor blueColor], NSUnderlineStyleAttributeName:@(NSUnderlineStyleDouble)} range:NSMakeRange(0, 5)];

显示

_label.attributedText = str;

2. 用表情代替带[]的文字（qq会话，微信会话）

定义正则表达式

NSString *pattern = @"\\[[\u4E00-\u9FA5]+\\]";

NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];

NSString *text = @"hello[1_1] world![哈哈]";

得到符合表达式的数组NSTextCheckingResult类型的

NSArray *resultArray = [regular matchesInString:text options:0 range:NSMakeRange(0, text.length)];

定义一个带附件的字符串

NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text];

for (NSTextCheckingResult *result in resultArray) {

位置

NSRange range = result.range;

得到附件

NSTextAttachment *attach = [[NSTextAttachment alloc] init];

设置附件的图片

attach.image = [UIImage imageNamed:@"d_guzhang"];

得到附件生成的字符串

NSAttributedString *imageStr = [NSAttributedString attributedStringWithAttachment:attach];

把文字替换成表情

[attStr replaceCharactersInRange:range withAttributedString:imageStr];

}

_label.attributedText = attStr;