iOS中类似QQ聊天表情的显示(图文混排)
前言:我们规定字符串中的表情以"["开始，"]"结尾。
1.首先我们分析一个字符串判断哪些是表情，哪些是文字然后加入一个数组中待用。
- (void)getMessageRange:(NSString*)message :(NSMutableArray*)array {
NSRange range=[message rangeOfString: @"["];
NSRange range1=[message rangeOfString: @"]"];
//判断当前字符串是否还有表情的标志。
if (range.length>0 && range1.length>0) {
if (range.location > 0) {
[array addObject:[message substringToIndex:range.location]];
[array addObject:[message substringWithRange:NSMakeRange(range.location, range1.location+1-range.location)]];
NSString *str=[message substringFromIndex:range1.location+1];
[self getMessageRange:str :array];
}else {
NSString *nextstr=[message substringWithRange:NSMakeRange(range.location, range1.location+1-range.location)];
//排除文字是“”的
if (![nextstr isEqualToString:@""]) {
[array addObject:nextstr];
NSString *str=[message substringFromIndex:range1.location+1];
[self getMessageRange:str :array];
}else {
return;
}
}
} else if (message != nil) {
[array addObject:message];
}
}
2.对得到的数组进行分析
NSMutableArray *contentArray = [NSMutableArray array];
[self getMessageRange:@"你需要显示的字符串" :contentArray];
NSMutableAttributedString *strM = [[NSMutableAttributedString alloc] init];
for (NSString *object in contentArray) {
NSLog(@"%@",object);
if ([object hasSuffix:@"]"]&&[object hasPrefix:@"["]) {
//如果是表情用iOS中附件代替string在label上显示
NSTextAttachment *imageStr = [[NSTextAttachment alloc]init];
imageStr.image = [UIImage imageNamed:[object substringWithRange:NSMakeRange(1, object.length - 2)]];
//这里对图片的大小进行设置一般来说等于文字的高度
CGFloat height = self.label.font.lineHeight;
imageStr.bounds = CGRectMake(0, 0, height, height);
NSAttributedString *attrString = [NSAttributedString attributedStringWithAttachment:imageStr];
[strM appendAttributedString:attrString];
}else{
//如果不是表情直接进行拼接
[strM appendAttributedString:[[NSAttributedString alloc] initWithString:object]];
}
}
self.label.attributedText = strM;
