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UICollectionView current visible cell index
...
The method [collectionView visibleCells] give you all visibleCells array you want. Use it when you want to get
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
for (UICollectionViewCell *cell in [self.mainImageCollection visibleCells]) {
NSIndexPath *indexPath = ...
Using multiple delimiters in awk
...a autosplit mode – perl will automatically split input lines into the @F array. Defaults to splitting on whitespace
-F autosplit modifier, in this example splits on either / or =
-e execute the perl code
Perl is closely related to awk, however, the @F autosplit array starts at index $F[0] while...
scipy.misc module has no attribute imread?
...ort imageio
im = imageio.imread('astronaut.png')
im.shape # im is a numpy array
(512, 512, 3)
imageio.imwrite('imageio:astronaut-gray.jpg', im[:, :, 0])
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How to catch curl errors in PHP
...meone need more information about curl errors
<?php
$error_codes=array(
[1] => 'CURLE_UNSUPPORTED_PROTOCOL',
[2] => 'CURLE_FAILED_INIT',
[3] => 'CURLE_URL_MALFORMAT',
[4] => 'CURLE_URL_MALFORMAT_USER',
[5] => 'CURLE_COULDNT_RESOLVE_PROXY',
[6] => '...
How to access the first property of a Javascript object?
...
This is not very efficient as it creates an entire array of all of the object's keys.
– Andrew Mao
Jan 29 '14 at 5:23
9
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How can I make my custom objects Parcelable?
...objects Parcelable. However, I have custom objects and those objects have ArrayList attributes of other custom objects I have made.
...
Iteration over std::vector: unsigned vs signed index variable
...; i != v.size(); i++) {
/* std::cout << v[i]; ... */
}
Using arrays
Using iterators
for(element_type* it = a; it != (a + (sizeof a / sizeof *a)); it++) {
/* std::cout << *it; ... */
}
Using Range C++11
for(auto const& value: a) {
/* std::cout << value; ......
Rails 4 - Strong Parameters - Nested Objects
...nested attributes you do specify the attributes of nested object within an array. In your case it would be
Update as suggested by @RafaelOliveira
params.require(:measurement)
.permit(:name, :groundtruth => [:type, :coordinates => []])
On the other hand if you want nested of multiple ...
Why are only final variables accessible in anonymous class?
...ble type of some description. This could be the enclosing class itself, an array, a mutable wrapper type... anything like that. Basically it's a bit like communicating between one method and another: changes made to the parameters of one method aren't seen by its caller, but changes made to the obje...
Descending order by date filter in AngularJs
...cording to documentation you can use the reverse argument.
filter:orderBy(array, expression[, reverse]);
Change your filter to:
orderBy: 'created_at':true
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