#pragma mark-- UITextViewDelegate

pragma mark– UITextViewDelegate

(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range

replacementText:(NSString *)text

{

//对于退格删除键开放限制

if (text.length == 0){

return YES;

}

UITextRange *selectedRange = [textView markedTextRange];

//获取高亮部分

UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];

//获取高亮部分内容

//NSString * selectedtext = [textView textInRange:selectedRange];

//如果有高亮且当前字数开始位置小于最大限制时允许输入

if (selectedRange && pos) {

NSInteger startOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.start];

NSInteger endOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.end];

NSRange offsetRange = NSMakeRange(startOffset, endOffset - startOffset);

if (offsetRange.location < MAX_LIMIT_NUMS) {
return YES;
}
else
{
return NO;
}

}

NSString *comcatstr = [textView.text stringByReplacingCharactersInRange:range withString:text];

NSInteger caninputlen = MAX_LIMIT_NUMS - comcatstr.length;

if (caninputlen >= 0)

{

//加入动态计算高度

CGSize size = [self getStringRectInTextView:comcatstr InTextView:textView];

// CGRect frame = textView.frame;

// frame.size.height = size.height;

// textView.frame = frame;

[textView mas_updateConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(size.height);

}];

return YES;

}

else

{

NSInteger len = text.length + caninputlen;

//防止当text.length + caninputlen < 0时，使得rg.length为一个非法最大正数出错

NSRange rg = {0,MAX(len,0)};

if (rg.length > 0)
{
NSString *s = @"";
//判断是否只普通的字符或asc码(对于中文和表情返回NO)
BOOL asc = [text canBeConvertedToEncoding:NSASCIIStringEncoding];
if (asc) {
s = [text substringWithRange:rg];//因为是ascii码直接取就可以了不会错
}
else
{
__block NSInteger idx = 0;
__block NSString  *trimString = @"";//截取出的字串
//使用字符串遍历，这个方法能准确知道每个emoji是占一个unicode还是两个
[text enumerateSubstringsInRange:NSMakeRange(0, [text length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock: ^(NSString* substring, NSRange substringRange, NSRange enclosingRange, BOOL* stop) {

NSInteger steplen = substring.length;
if (idx >= rg.length) {
*stop = YES; //取出所需要就break，提高效率
return ;
}

trimString = [trimString stringByAppendingString:substring];

idx = idx + steplen;
}];

s = trimString;
}
//rang是指从当前光标处进行替换处理(注意如果执行此句后面返回的是YES会触发didchange事件)
[textView setText:[textView.text stringByReplacingCharactersInRange:range withString:s]];

//由于后面反回的是NO不触发didchange
[self refreshTextViewSize:textView];
//既然是超出部分截取了，哪一定是最大限制了。
// 显示多少个字

// self.lbNums.text = [NSString stringWithFormat:@”%d/%ld”,0,(long)MAX_LIMIT_NUMS];

}

return NO;

}

}

(void)textViewDidChange:(UITextView *)textView

{

self.adressCell.valueTextField.text = textView.text; // 触发kvo

UITextRange *selectedRange = [textView markedTextRange];

//获取高亮部分

UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];

//如果在变化中是高亮部分在变，就不要计算字符了

if (selectedRange && pos) {

return;

}

NSString *nsTextContent = textView.text;

NSInteger existTextNum = nsTextContent.length;

if (existTextNum > MAX_LIMIT_NUMS)

{

//截取到最大位置的字符(由于超出截部分在should时被处理了所在这里这了提高效率不再判断)

NSString *s = [nsTextContent substringToIndex:MAX_LIMIT_NUMS];

[textView setText:s];

}

//不让显示负数 口口日

// self.lbNums.text = [NSString stringWithFormat:@”%ld/%d”,MAX(0,MAX_LIMIT_NUMS - existTextNum),MAX_LIMIT_NUMS];

[self refreshTextViewSize:textView];

}

-(void)textViewDidEndEditing:(UITextView *)textView{

self.adressCell.valueTextField.text = textView.text; // 触发kvo

[self getStoreAndStoreSiteWithDetailSite:textView.text];

}

(void)refreshTextViewSize:(UITextView *)textView

{

CGSize size = [textView sizeThatFits:CGSizeMake(CGRectGetWidth(textView.frame), MAXFLOAT)];

// CGRect frame = textView.frame;

// frame.size.height = size.height;

// textView.frame = frame;

[textView mas_updateConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(size.height);

}];

}

(CGSize)getStringRectInTextView:(NSString )string InTextView:(UITextView )textView;

{

//

// NSLog(@”行高 ＝ %f container = %@,xxx = %f”,self.textview.font.lineHeight,self.textview.textContainer,self.textview.textContainer.lineFragmentPadding);

//

//实际textView显示时我们设定的宽

CGFloat contentWidth = CGRectGetWidth(textView.frame);

//但事实上内容需要除去显示的边框值

CGFloat broadWith = (textView.contentInset.left + textView.contentInset.right

+ textView.textContainerInset.left

+ textView.textContainerInset.right

+ textView.textContainer.lineFragmentPadding/左边距/

+ textView.textContainer.lineFragmentPadding/右边距/);

CGFloat broadHeight = (textView.contentInset.top

+ textView.contentInset.bottom

+ textView.textContainerInset.top

+ textView.textContainerInset.bottom);//+self.textview.textContainer.lineFragmentPadding/top//+theTextView.textContainer.lineFragmentPadding//there is no bottom padding/);

//由于求的是普通字符串产生的Rect来适应textView的宽

contentWidth -= broadWith;

CGSize InSize = CGSizeMake(contentWidth, MAXFLOAT);

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];

paragraphStyle.lineBreakMode = textView.textContainer.lineBreakMode;

NSDictionary *dic = @{NSFontAttributeName:textView.font, NSParagraphStyleAttributeName:[paragraphStyle copy]};

CGSize calculatedSize = [string boundingRectWithSize:InSize options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size;

CGSize adjustedSize = CGSizeMake(ceilf(calculatedSize.width),calculatedSize.height + broadHeight);//ceilf(calculatedSize.height)

return adjustedSize;

}