如何在 UITextView 的文本中添加 、 > 和 <？

Question

我的应用需要添加字符串  , >和 <到 UITextView 中的文本中，以便我们可以在正确的位置替换字符串。我们知道 UITextView 会改变字符串  到空间，>到 > 和 <到 <. uitextview>

谢谢你。问候。

Answer 1

+ (NSString *)extractTextFromXML:(NSString *)xml{
//Will hold just the text
NSMutableString *text = [NSMutableString string];
NSInteger startOfSubstring = 0;
//Finds first instance of "<"
NSRange startTagRange = [xml rangeOfString:@"<"];
while(startTagRange.location != NSNotFound){
    //Extracts text from last location up to "<"
    NSString *substring = [xml substringWithRange:NSMakeRange(startOfSubstring, startTagRange.location-startOfSubstring)];
    //Removes whitespace from substring
    [text appendString:[substring stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]];

    //Searches for ">" from "<" to end of string
    NSRange startTagToEndRange = NSMakeRange(startTagRange.location, [xml length]-startTagRange.location);
    NSRange endTagRange = [xml rangeOfString:@">" options:NSCaseInsensitiveSearch range:startTagToEndRange];
    //If ">" found, then sets next location of substring to after that
    if(endTagRange.location != NSNotFound){
        startOfSubstring = endTagRange.location+1;
    }
    //If no ">", then appends rest of string and returns
    else{
        [text appendString:[xml substringFromIndex:startTagRange.location]];
        return text;
    }
    //Finds next "<" in string
    NSRange endTagToEndRange = NSMakeRange(startOfSubstring, [xml length]-startOfSubstring);
    startTagRange = [xml rangeOfString:@"<" options:NSCaseInsensitiveSearch range:endTagToEndRange];
}

return text;

}

或者你可以使用 UIWebView 代替 UITextView