I have tried the CoreData modification operation in Demo as follows: 1, first create a new basic table and add fields, then add some data in app 2, exit app, new table, add new fields, add Relationships 3, and there is no flicker after rerunning the ...

popularize the QR code what to do when 1 out of 1 million people cannot generate a QR code? ...

when developing swift with appcode, there is no code hint after cocoapods import. But after a few days, there is inexplicable again, every project is like this, it must be a few days later, has anyone ever encountered this problem? Can it be solved? ...

what s the difference between NSStringFromClass (self) and NSStringFromClass ([self class])? ...

I want to do a macOS application, and now it s mainly stuck on the clipboard. would like to ask the gods, swift how to copy the file to the clipboard, and then right-click in the Finder to paste the file? Note: copy the file, not the text, the te...

request that many news interfaces are used. After the drop-down refresh, a prompt box comes out and studies how this is not found. Does anyone know? is the yellow box that has updated 8 pieces of information for you ...

how to compile lame3.1.0? I directly make reported that I couldn t find X841464 ....

android studio development tools how does the android camera display range consistent with the range specified by surfaceview? do not wait to display the video range beyond the range specified by surfaceview. Do not show that the video range is only di...

how do I use classification to implement lazy loading attributes in inheritance? ...

the system navigation bar is hidden on the front page according to the demand, and the navigation bar is displayed on the next page, so the problem should be very simple: the first thing that comes to mind is the inversion of ViewwillAppear: and Viewwi...

it is possible in China. But when I called American customer service, he said he couldn t open it. Has anyone ever encountered this problem 2018.05.09 know from the front end that the website server has set IP restrictions and can only be accessed...

libo info that .a spends X86-64 but reports this error when running ...

What s the use of ? ...

var table: UITableView! UITableView? Is the optional UITableView type, then UITableView! What does it mean? ...

can homebrew only install the latest version of the software? where is the source of the software, homebrew s own server? what s the difference between downloading and installing the root itself from the official website? ...

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git remote add origin git@github.com:suiweinuv demo1.git Why remote Kujiao origin, when operating locally, but the real demo1? displayed on GitHub ...

such as svnserve-- version ...

an error is reported when using SQLite.swift to use try db.run on existing database tables (table.addColumn (title)) adds a title column. the code is as follows: create a table private func creatTable(filePath: String) { do { db = t...

seek swift advanced epub mobi e-books ...