iOS YYTextView 限制输入字数

监听文本变化通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textViewDidChangeNotification:) name:YYTextViewTextDidChangeNotification object:nil];
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处理限制

-(void)textViewDidChangeNotification:(NSNotification *)obj{
    YYTextView *textView = (YYTextView *)obj.object;
    NSString *string = textView.text;
    NSInteger maxLength = 15;
    //获取高亮部分
    YYTextRange *selectedRange = [textView valueForKey:@"_markedTextRange"];
    NSRange range = [selectedRange asRange];
    NSString *realString = [string substringWithRange:NSMakeRange(0, string.length - range.length)];
    if (realString.length >= maxLength){
        textView.text = [realString substringWithRange:NSMakeRange(0, maxLength)];
    }
}
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