設置UITextView根據內容動態設置高度的簡單方法，相似微信發朋友圈時的文本輸入效果實現😁

設置UITextView根據內容動態設置高度的簡單方法

 

今天給你們介紹的是設置UITextView根據內容動態設置高度，我用的是SDLayout的佈局方式，方法很簡單能夠根據本身的佈局方式作修改，直接上代碼：

- (void)textViewTextDidChangeNotiAction:(NSNotification *)obj{
    
    UITextView *textView = (UITextView *)obj.object;
    if(textView == self.contentTextView){
        
        //得到textView的初始尺寸
        CGFloat width = CGRectGetWidth(self.contentTextView.frame);
        CGFloat height = CGRectGetHeight(self.contentTextView.frame);
       //獲取當前內容下的textView的尺寸 CGSize newSize = [self.contentTextView sizeThatFits:CGSizeMake(width,MAXFLOAT)];
        
        CGRect newFrame = self.contentTextView.frame;
        
       // newFrame.size = CGSizeMake(fmax(width, newSize.width), fmax(height, newSize.height));
        newFrame.size = CGSizeMake(newSize.width, newSize.height);
        
        LYLog(@"新高度：%f",newFrame.size.height);
        
        //self.contentTextView.frame = newFrame;
        
        self.contentTextView.sd_resetLayout
        .topSpaceToView(self, 10.f)
        .leftSpaceToView(self, 15.f)
        .rightSpaceToView(self, 15.f)
        .heightIs(newFrame.size.height);
        
        self.textNumLabel.sd_resetLayout
        .topSpaceToView(self.contentTextView,5.f)
        .rightSpaceToView(self, 15.f)
        .widthIs(100.f)
        .heightIs(20.f);
        [self.contentTextView updateLayout];
        self.inputText = self.contentTextView.text;
        if([self.contentTextView.text isEqualToString:@"這一刻的想法"]){
            self.inputText = @"";
        }else {
            
            if(self.contentTextView.text.length > 500){
                [self.contentTextView endEditing:YES];
                
                [MBProgressHUD showText:@"內容不能超過500個字" toView:nil];
                
                self.inputText = [self.contentTextView.text substringToIndex:500];
                self.contentTextView.text = self.inputText;
            }
        }
        
        self.textNumLabel.text = [NSString stringWithFormat:@"%lu/%lu",(unsigned long)self.inputText.length,500 - self.inputText.length];
        
        [self updateInputText];
        
        LYLog(@"輸入的內容：%@",self.contentTextView.text);
    }
    
    [self setupAutoHeightWithBottomView:self.textNumLabel bottomMargin:10.f];
}

 效果以下圖：

圖一

圖二