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HMAC is the key Related hash operation message authentication code, HMAC operation uses a hash algorithm, takes a key and a message as input, and
IPAD viewport problem between portraits and landscape
I have a web page that appears on the ipad. I added this meta for the viewport:
It works very well in portraits, and then it also works normally when ipad enters landscape mode. The problem i
iPhone – Disable BackButton when pushing a navigation controller via a tab
I have a navigation controller. I create a tab bar controller and add 3 subviews. This way I can navigate back to the root view controller.
If only one view controller is pushed to the naviga
Cocoa Touch – iPad detection UIPOPOVERCONTROLLERS is turned off
There are several uiPopoverControllers in my universal iPad application. Once a popover is closed, I now have a request to trigger a function. If the user clicks “close” in the pop-up window, I can
iPhone – OpenGL texture mixing problem
I am using OpenGL ES to create a 2D application for the iPad, and I have some problems drawing transparent images.
I am using a fully transparent png- 24 images. I am also changing the color
[Repost] 18W is not enough to buy 30W charger? iPhone 11 Pro Max charging evaluation
Is it necessary to buy a 30W charger if I’m not full at 18W? iPhone 11 Pro Max charging evaluation https://www.cnbeta.com/articles/tech/895237.htm
Buy a device another day and play with it to m
Debug JavaScript error on the iPad
Is there a way to debug JavaScript pages running on the iPad? Go to this location and enable the debugging console.
iOS6:
The debug console is gone. Use alternative methods to get it
iPhone – Core Data Concurrent (NSOpe)
wrote in Apple docs:
…you should create the context in
main ( for a serial queue) or start
(for a concurrent queue).
But I really don’t get any difference. Why can’t I create a contex
Test iPad keyboard hidden button
Hi, is there a way to detect hidden buttons on the iPad keyboard? I mean when the user presses this button:
Something will happen!
[[NSNotificationCenter defaultCenter] addObserver:self
iPhone – Using some symbols as an example method
I looked at a piece of code today and noticed that this particular encoder uses dot notation to access instance methods (these methods do not accept values, they only return values). For exam