This question already has answers here:
What does #synchronized() do as a singleton method in objective C?
(6 answers)
Closed 10 years ago.
I meet this code:
#synchronized (self.messageQueue) {
[self.messageQueue insertObject:messageDictionaryRepresentation atIndex:0];
}
I want to ask for help what this syntax(#synchronized) use for?
Thanks.
See Synchronization. You find that is "a convenient way to create mutex locks on the fly in Objective-C code". a related question is What does #synchronized() do?.
Related
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Where are the UIKit Framework implementation files located?
(2 answers)
Closed 6 years ago.
I was just wondering if there is a way to read the internal implementation of Apple's API on ios? For example, is there a way I can see how "setNeedsDisplay()" function of UIView is implemented internally? I think this will help me understand how the code actually works.
The source code to the Apple frameworks is not publicly-available. You can disassemble the framework code, but unless you're really good with assembly language, you probably won't learn much.
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How to prevent EXC_BAD_ACCESS from crashing an app?
(3 answers)
Closed 7 years ago.
How does EXC BAD ACCESS occur ?
Is it regarding the situation while we are trying to access a variable that is already released ?
As the name signify this error comes when application is trying to access a memory location that does not exists (majorly caused when trying to access a object that is already released). You can get a detailed explanation here.
This question already has answers here:
Swift: print() vs println() vs NSLog()
(6 answers)
Closed 7 years ago.
What is the difference between NSLog(), println, and print?
From my experience and understanding, they all write in the Console/Debugging area but why is there the change in Swift v1.2 and v2.0?
If you use 2.0 then print will offer more functionality, but they are still the same thing. Please refer to the documentation to see the added functionality.
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/
Also don't use NSLog if you are using Swift
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Lua socket asynchronous calls
I think my question is pretty clear. So, how?
Discussed in Programming in Lua (non-preemptive multithreading) and on SO here and here.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
What is Erlang written in?
I hear somewhere erlang is more efficient than c/c++,the only possibility would be that the language itself is written in assembly or even machine code.
So which language is erlang implemented in?
What is Erlang written in?
Answer: Erlang