鑒于很多人瀏覽過本文,為了不讓之前糟糕的格式浪費大家寶貴的時間我重新寫了一篇更新版,親們還是移步那篇把.
? ? ? 最近研究了含表情的字符串，我們實現(xiàn)像??的其實不難??，輸入法都支持??，但是如果想換成自己需要的圖片表情，甚至GIF動畫表情，就要花一番功夫了????????。
除了利用webview寫HTML的方法外，有一種更加清明的方法，那就是屬性字符串，即NSAttributedString、NSMutableAttributedString，顧名思義后者就是可變的而已。
首先，先實現(xiàn)普通字符串轉屬性字符串吧（網(wǎng)上現(xiàn)成的??）：
+(NSMutableAttributedString *)stringToAttributeString:(NSString *)text
{
//先把普通的字符串text轉化生成Attributed類型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @"\\[\\([a-zA-Z0-9\u4e00-\u9fa5]+\\)\\]"; //正則表達式 ,例如? [(呵呵)] = ??
NSError * error;
NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];
if (!re)
{
NSLog(@"%@??",[error localizedDescription]);//打印錯誤??
}
NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];//遍歷字符串,獲得所有的匹配字符串
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emj" ofType:@"plist"];? //plist文件,制作一個 數(shù)組,包含文字,表情圖片名稱
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];//獲取 所有的數(shù)組
//如果有多個表情圖，必須從后往前替換，因為替換后Range就不準確了
for (int j =(int) arr.count - 1; j >= 0; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for (int i = 0; i < face.count; i++) {
if ([[text substringWithRange:result.range] isEqualToString:face[i][@"key"]])//從數(shù)組中的字典中取元素
{
NSString * imageName = [NSString stringWithString:face[i][@"picture"]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];//添加附件,圖片
//textAttachment.bounds=CGRectMake(0, 0, 20, 20);//調節(jié)表情大小
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];//替換未圖片附件
break;
}
}
}
return attStr;
}
//==============??=======================
當然，你肯定會需要轉回來??：
//把帶有圖片的屬性字符串轉成普通的字符串
+ (NSString *)textString:(NSAttributedString *)attributedText
{
NSMutableAttributedString * resutlAtt = [[NSMutableAttributedString alloc]initWithAttributedString:attributedText];
EmoticonsHelper * helper = [EmoticonsHelper new];
//枚舉出所有的附件字符串
[attributedText enumerateAttributesInRange:NSMakeRange(0, attributedText.length) options:NSAttributedStringEnumerationReverse usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {
NSTextAttachment * textAtt = attrs[@"NSAttachment"];//從字典中取得那一個圖片
if (textAtt)
{
UIImage * image = textAtt.image;
NSString * text = [helper stringFromImage:image];
[resutlAtt replaceCharactersInRange:range withString:text];
}
}];
return resutlAtt.string;
}
//獲取圖片數(shù)組
-(NSArray *)getAllImagePaths//數(shù)組結構還是上述的截圖的數(shù)組結構
{
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emojo" ofType:@"plist"];
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
return face;
}
//=================================
會不會需要屬性字符串的尺寸大小呢？不用著急，直接有代碼：
+(CGSize)getAttributedTextSize:(NSString *)text
{
//先把普通的字符串text轉化生成Attributed類型的字符串
NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];
NSString * zhengze = @"\\[\\([a-zA-Z0-9\u4e00-\u9fa5]+\\)\\]";
NSError * error;
NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];
if (!re)
{
NSLog(@"正則表達式匹配錯誤%@" ,[error localizedDescription]);
}
NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];
if (!arr.count)//說明字符串中沒有表情通配符,是普通的文本,則計算文本size
{
NSDictionary *dic=@{NSFontAttributeName: [UIFont systemFontOfSize:14]};
CGSize size1=[text boundingRectWithSize:CGSizeMake(160, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
if (size1.height<=60)
{
size1.height=60;
}
else
{
size1.height+=15;
}
return size1;
}
NSBundle *bundle = [NSBundle mainBundle];
NSString * path = [bundle pathForResource:@"emj" ofType:@"plist"];
NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];
//如果有多個表情圖，必須從后往前替換，因為替換后Range就不準確了
for (int j =(int) arr.count - 1; j >= 0; j--) {
//NSTextCheckingResult里面包含range
NSTextCheckingResult * result = arr[j];
for (int i = 0; i < face.count; i++) {
if ([[text substringWithRange:result.range] isEqualToString:face[i][@"key"]])
{
NSString * imageName = [NSString stringWithString:face[i][@"picture"]];
NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];
textAttachment.image = [UIImage imageNamed:imageName];
NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
[attStr replaceCharactersInRange:result.range withAttributedString:imageStr];
break;
}
}
}
CGSize size2=[attStr boundingRectWithSize:CGSizeMake(180, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;
size2.height+=40;? //表情文字增加高度
return size2;//返回屬性字符串的尺寸
}
//==================================================
當然，以上這些都是網(wǎng)上現(xiàn)成的??，下面要寫一點不一樣的東西了??????????????????????????????????????????????
???????? 首先我們知道和字符串相關的UI控件呢不外乎那么幾種，怎么樣利用上屬性字符串呢??？
1、UITextView、UITextField
以UITextView為例，假設你得到的屬性字符串是NSAttributedString *result，我要顯示出表情圖片還得：
[TextView.textStorage insertAttributedString:result TextView.selectedRange.location];
TextView.selectedRange = NSMakeRange(TextView.selectedRange.location+1, 0);
//重置格式
NSRange wholeRange = NSMakeRange(0,TextView.textStorage.length);
[TextView.textStorage removeAttribute:NSFontAttributeName range:wholeRange];
[TextView.textStorage addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20.0f] range:wholeRange];
這樣不但能顯示表情圖片到你的TextView里??，還能通過UIFont
設置顯示的大小。
2、UILabel
這個控件就不用多說了，直接有個屬性名字叫attributedText，設上result
就能顯示了。
本文就到此結束了??????????。。。。。
