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How do I know that the UICollectionView has been loaded completely?

I have to do some operation whenever UICollectionView has been loaded completely, i.e. at that time all the UICollectionView's datasource / layout methods should be called. How do I know that?? Is there any delegate method to know UICollectionView loaded status? ...
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Reading an Excel file in python using pandas

...class itself, rather than the instance, which is okay (although not very idiomatic), but if you're doing that you would also need to pass the sheet name: >>> parsed = pd.io.parsers.ExcelFile.parse(xl, "Sheet1") >>> parsed.columns Index([u'Tid', u'dummy1', u'dummy2', u'dummy3', u'd...
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Table header to stay fixed at the top when user scrolls it out of view with jQuery

...mehow), it will stay put at the top? Anyone can give me a Javascript solution to this? 25 Answers ...
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How to delete a whole folder and content?

I want the users of my application to be able to delete the DCIM folder (which is located on the SD card and contains subfolders). ...
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sprintf like functionality in Python

...and finally write the buffer in a text file using a C-style sprintf functionality in Python. Because of conditional statements, I can’t write them directly to the file. ...
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How to Animate Addition or Removal of Android ListView Rows

In iOS, there is a very easy and powerful facility to animate the addition and removal of UITableView rows, here's a clip from a youtube video showing the default animation. Note how the surrounding rows collapse onto the deleted row. This animation helps users keep track of what changed in a li...
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Favicon dimensions? [duplicate]

I have a favicon with the dimensions of height=26px / width=20px named favicon.png 10 Answers ...
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How to write asynchronous functions for Node.js

I've tried to research on how exactly asynchronous functions should be written. After a lot of plowing through a lot of documentation, it's still unclear to me. ...
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Can I safely delete contents of Xcode Derived data folder?

...projects again. Xcode8+ Update From the Xcode8 that removed project option from the window tab so you can still use first way: Xcode -> Preferences -> location -> click on small arrow button as i explain in my first answer. Xcode7.3 Update For remove particular project's DeriveData y...
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Passing Data between View Controllers

I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: 46 Answers ...