Simple implementation of abstract game loop using CADisplayLink technique.
The NTLoop class provides part of the standard view controller functionality, it implements loop using CADisplayLink (TODO: add NSTimer for compatibility with old devices). An NTLoop object usually works in conjunction with a view object to display frames of animation in the view or to update application logic using time interval since last update.
To use this class, allocate and initialize a new NTLoop subclass with frame intrerval (1 means 60 frames per second, 2 means 30 frames per secon and so on) using update block object or set its delegate. You can set a delegate or configure other properties on the view controller, such as whether the loop is automatically paused or resumed when the application moves into the background.
When active, loop automatically updates application data using time interval since last update. The view controller calls its delegate’s ntLoopUpdate: method. If you use delegate then your delegate should update data that does not involve rendering the results to the screen.
- Clone repository
- Drag files to your project and choose option "Copy items into destination group's folder (if needed)"
- Link against QuartzCore framework (Click on your project at navigator panel, choose your build target, go to "Build Phases" tab, then "Link binary with libraries" and add "QuartzCore.framework")
- Import
NTLoop.hheader to your project and build!
It's better to install NTLoop as a git submodule
cdto existing project's git repositorygit submodule add https://github.com/nmtitov/NTLoop.git NTLoopgit submodule statusgit submodule update- Drag files to your project and DO NOT choose option "Copy items into destination group's folder (if needed)"
- Link against QuartzCore framework (Click on your project at navigator panel, choose your build target, go to "Build Phases" tab, then "Link binary with libraries" and add "QuartzCore.framework")
- Import
NTLoop.hheader to your project and build! - Commit changes.
cdto existing project's git repositorycd NTLoopgit checkout mastergit pull origin mastercd ..git add NTLoopgit commit -m 'Updated NTLoop to latest version'
Add to your AppDelegate.m
#import "NTLoop.h"
@interface AppDelegate()
@property (strong, nonatomic) NTLoop *gameLoop;
@end
@implementation AppDelegate
@synthesize gameLoop;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.gameLoop = [[NTLoop alloc] initWithFrameInterval:1.0 usingBlock:^(NSTimeInterval timeSinceLastUpdate) {
NSLog(@"Wow this is so simple!");
}];
return YES;
}
@end
If you are getting error report like this one, you should link agains QuartzCore framework as described in Installation sections
Undefined symbols for architecture i386:
"_CACurrentMediaTime", referenced from:
-[NTLoop timeSinceLastUpdate] in NTLoop.o
"_OBJC_CLASS_$_CADisplayLink", referenced from:
objc-class-ref in NTLoop.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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