小编use*_*614的帖子

我必须从数据库中填充表格单元格,并且图像在设备上.我要存储该图像imageDataObject,如何将其转换UIImage为NSData.请建议,我尝试了许多解决方案,但它不转换回该NSData给UIImage.

    cell.textLabel.text = [[offlineImageListArray objectAtIndex:indexPath.row] imageName];
    UIImage *thumbnail = [self retrieveImageFromDevice:[[offlineImageListArray objectAtIndex:indexPath.row] imageName]];
    NSData* data = ??????????;
    ImageData *imageDataObject = [[ImageData alloc] initWithImageId:[[offlineImageListArray objectAtIndex:indexPath.row]imageId] 
    imageName:[[offlineImageListArray objectAtIndex:indexPath.row] imageName] imageData:data];
    [imagesArray addObject:imageDataObject];

我在javascript中这样做,如何将焦点设置为jquery中的第一个复选框.

var chk = document.getElementsByName('program[]');
var len = chk.length;
var checked = false;
for(var i=0; i<len; i++) {
     if(chk[i].checked) {
        checked = true;
        break;    
      } 
}
if( !checked ) {
    chk[0].focus();
    document.getElementById('errpgm').innerHTML = "Please select at 
            least one program";
    errcount++;
}