在表格视图单元格中调整图像大小

Question

resize a image in table view cell... i am new programmer

by this code image comes in cell... but i wants resize image according to my need....

if possible give me little code... thanks in advance...

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:[NSString stringWithFormat:@"Cell %i",indexPath.section]];

    if (cell == nil) {
        //.......
    }
    search_items *pro = [result objectAtIndex:0];

    if(indexPath.row==0)
    {

    NSString *filepath=[[NSBundle mainBundle]pathForResource:pro.s_image ofType:@"png"];

    UIImage *image=[UIImage imageWithContentsOfFile:filepath];

    cell.imageView.contentMode = UIViewContentModeScaleAspectFit;

    //[cell.imageView setContentMode:UIViewContentModeScaleAspectFit];

    [cell.imageView setFrame:CGRectMake(50,50,100,100)];

    /*
    CGRect iframe = cell.imageView.frame;
    iframe.size.height = 100.0;
    iframe.size.width=300.0;

    cell.imageView.frame = iframe;

    */


    cell.imageView.image=image; 
    }
}

Answer 1

Rather than resizing the cell.imageView frame, try resizing the image before assigning it to cell.imageView.image:

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString * cellIdentifier = @"cellIdentifier";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    cell.textLabel.text = @"My Cell's Title Text";
    cell.detailTextLabel.text = @"My Cell's Description Text";

    //### SETTING THE IMAGE HERE###
    //Let's say I want to resize my image entitled "myImage.png" to be 50x50 pixels in the table cell
    CGSize size = {50,50};
    cell.imageView.image = [self imageWithImage:[UIImage imageNamed:@"myImage.png" scaledToSize:size];

    return cell;
}

//Given a UIImage and a CGSize, this method will return a resized UIImage.
- (UIImage*)imageWithImage:(UIImage*)image
          scaledToSize:(CGSize)newSize;
{
    UIGraphicsBeginImageContext( newSize );
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

Sources:

• http://lukagabric.com/resize-image/
• Can UIimage change the size and resolution of pictures?

Answer 2

You can change the frame of the imageView like this:

CGRect frame = imageView.frame;
frame.size.height = 30.0;
/* other frame changes ... */
imageView.frame = frame;

You should also look at the UIImageView contentMode property (see this post ). It gives you control over how the image is drawn, and is actually a UIView property (so UIImageView inherits it). It gives you the following options:

Specifies how a view adjusts its content when its size changes.

typedef enum {
   UIViewContentModeScaleToFill,
   UIViewContentModeScaleAspectFit,
   UIViewContentModeScaleAspectFill,
   UIViewContentModeRedraw,
   UIViewContentModeCenter,
   UIViewContentModeTop,
   UIViewContentModeBottom,
   UIViewContentModeLeft,
   UIViewContentModeRight,
   UIViewContentModeTopLeft,
   UIViewContentModeTopRight,
   UIViewContentModeBottomLeft,
   UIViewContentModeBottomRight,
} UIViewContentMode;

Answer 3

You should use the backgroundView property of your cell and add a stretchable image :

UIImage* backgroundImage = [[UIImage imageNamed:@”stretchableImage.png”] stretchableImageWithLeftCapWidth:44 topCapHeight:45];

Hope this helps, Vincent

Answer 4

1°) Well, by resizing, you mean which is scaled properly? You should check the contentMode property of the UIImageView class [ cell.imageView setContentMode: ];

2°) If you want to resize the frame, then just do [ cell.imageView setFrame:CGRectMake() ];

Depends what's really your problem ^^

Good Luck.