如何在没有滚动的情况下根据文本长度动态更改textview高度和单元格高度

Question

这是我在 table 中显示数据的代码，我的完整数据未显示在单元格中。第一张图片是当我将 scrollable 设置为 no 时，第二张图片是当我没有设置 scrollable.i 时 beginner.plz 帮我解决这个问题。

- (void)textViewDidChange:(UITextView *)textView{
[table beginUpdates];
[table  endUpdates];
}

-(void)createdatabase{

BOOL success;

NSFileManager *filemanager = [NSFileManager defaultManager];

success = [filemanager fileExistsAtPath:datapath];

if (success)return;

NSString *databasefromapp = [[[NSBundle mainBundle] resourcePath]stringByAppendingPathComponent:dataname];

[filemanager copyItemAtPath:databasefromapp toPath:datapath error:nil];

}

-(void)getdatabase{

eventitleary = [[NSMutableArray alloc]init];
eventdescary = [[NSMutableArray alloc]init];
eventimgary = [[NSMutableArray alloc] init];

sqlite3 *dataname1;

if (sqlite3_open([datapath UTF8String],&dataname1) == SQLITE_OK) {

    const char *sqlStatement;

    sqlStatement = "SELECT * FROM photography_events";


    sqlite3_stmt *compiledStatement;

    if(sqlite3_prepare_v2(dataname1, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
    {
        // Loop through the results and add them to the feeds array

        while(sqlite3_step(compiledStatement) == SQLITE_ROW)
        {
            // Read the data from the result row

            NSString *str_title = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];

            [eventitleary addObject:str_title];

            NSString *str_desc = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];

            [eventdescary addObject:str_desc];

            NSData *data = [[NSData alloc] initWithBytes:sqlite3_column_blob(compiledStatement, 2) length:sqlite3_column_bytes(compiledStatement, 2)];
            [eventimgary addObject:data];

        }

    }
}

NSLog(@"%@", eventitleary);
}


- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
 }

 -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

return 1;

 }
 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return eventitleary.count;
 }

 -(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

NSString *cellidenti = @"CellIdenti";

TableViewCell2 *cell = (TableViewCell2*)[tableView dequeueReusableCellWithIdentifier:cellidenti];

if (cell == nil) {
    NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"TableViewCell2" owner:self options:nil];
    cell = [nib objectAtIndex:0];
}
cell.eventitlelbl.text = [eventitleary objectAtIndex:indexPath.row];

cell.eventdesc.text = [eventdescary objectAtIndex:indexPath.row];
cell.eventdesc.editable = NO;
//cell.eventdesc.scrollEnabled = NO;
[cell.eventdesc sizeToFit];

frame = cell.eventdesc.frame;

frame.size = cell.eventdesc.contentSize;

cell.eventdesc.frame = frame;

NSData *dataimg = (NSData*)[eventimgary objectAtIndex:indexPath.row];

cell.eventimg.image = [UIImage imageWithData:dataimg];

return cell;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

// Return the height with a bit of additional padding space
return frame.size.height + 300;
}

Answer 1

您可以通过自适应布局来实现。 Check this awesome tutorial if you are working with autolayout。否则，您可以通过计算文本适合的高度来设置动态 tableView 单元格高度。

您可以使用以下方法计算文本的高度。传递文本、所需字体和文本视图的宽度。

-(CGFloat)heightForText:(NSString*)text withFont:(UIFont *)font andWidth:(CGFloat)width
{
   CGSize constrainedSize = CGSizeMake(width, MAXFLOAT);
   NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName,nil];
   NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:text attributes:attributesDictionary];
   CGRect requiredHeight = [string boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];
   if (requiredHeight.size.width > width) {
    requiredHeight = CGRectMake(0,0,width, requiredHeight.size.height);
   }
   return requiredHeight.size.height;
}


-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return [self heightForText:@"your text view text for this row" withFont:[UIFont fontWithName:@"Helvetica" size:16] andWidth:320];
}

Answer 2

我刚知道，我想动态地做而不是使用自动布局，这是我的 code.Hope 将来它适用于任何人。

如何在没有滚动的情况下根据文本长度动态更改textview高度和单元格高度

how to dynamically change the textview height and cell height according to the text length without the scroll

dynamic

objective-c

uitableview

uitextview

ios