Hi
Is it possible, in Cocoa, do program a loop which goes something like this:
for i=1 to 20
do something
block for GUI user input
do something with the input
repeat
It is for a simple game that plays tones etc, and lets the user guess what was
played. Originally, I had implemented it without a loop, just using regular
target/action mechanisms. The code got awfully complex with too many state
variables, and it got difficult to implement new functionality etc. So, I tried
implementing it as a loop running in a separate thread, but the loop is
supposed to add/remove subviews on an NSView as the game progresses, and I
found out that NSView doesn't want you to do that from a different thread than
the main thread. I thought it would get cumbersome to arrange for messaging to
the main thread to switch views, so I thought maybe running the loop in the
main thread, and using NSRunLoop might be a solution?
I have no clue about NSRunLoop, but I tried that idea, and implement the method
waiting for UI input this way:
-(int)waitForInput {
while( inputAvailable != CodeInput )
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate
dateWithTimeIntervalSinceNow:1.0]];
inputAvailable = NoInput;
return( inputCode );
}
The event handling methods should then update the instance variable
inputAvailable to equal CodeInput (an enum value), and the inputCode would be
updated to tell the game loop what choice the user made. But during the
NSRunLoop statement no input is accepted at all. The handler methods are never
run. I guess I'm completely lost and that NSRunLoop was never meant for this
type of thing.
The game has several windows in which the user can click to respond to the game
questions, therefore trying to run modally for one window is not ideal. If
running modal for a window is the recomended way, I might look into collecting
all the current input views into one window.
So, what do you recommend?
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