2个独立UIviews上的2个核心图，具有动态数据更新功能

Question

嗨，我目前正在使用core-plot来绘制一个动态图形，并且工作正常，现在我正在考虑在2个独立的视图上添加2个图形

我已经开始使用-1\f25 Mainview drawing Graph-1 \f6和-1\f25 Flipview drawing Graph-2 \f6的-1\f25 Utility Application-1\f6(实用程序

主视图图形运行良好，并且图形每2秒更新和重新加载一次，但是当我触摸"flipviewWindow“时，graph2总是以新值和新的graph2data数组开始(可能是因为graph2timer被再次调用？)但graph1data只使用一个NSTimer进行维护，并且运行良好。

我不想释放这些值，因为我希望看到具有先前值的图形，就像在Graph1中一样。

有人可以建议如何在两个独立的UIviews上实现动态数据更新的两个核心图吗？我的图逻辑如下

In MainViewController.m
    -(void)viewDidLoad{
    [super viewDidLoad];
    [self ConstructGraph1]
}

-(void)ConstructGraph1 {
        graph1 = [[CPXYGraph alloc] initWithFrame:CGRectZero];
    CPTheme *theme = [CPTheme themeNamed:kCPStocksTheme];
    [graph1 applyTheme:theme];
    mainViewWindow.hostedGraph=graph1;
    .
    .
    .
    .
    .
       myTimer1=[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(graph1Timer:) userInfo:nil repeats:YES];
}

-(void) graph1Timer: (NSTimer *) Timer{
  NSTimeInterval aTimeInterval1 = [[NSDate date]
                                    timeIntervalSinceReferenceDate];
    Get JSON request and add object at every 2 sec, after succesfully fetching
    [graph1data addObject:...]
    [graph1 reloadData];
}

- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller
{
    [self dismissModalViewControllerAnimated:YES];
}

- (IBAction)showFlipWindow:(id)sender
{    
    FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil];
    controller.delegate = self;
    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
    [controller release];
}

In FlipViewController.m
-(void)viewDidLoad{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor]; 
    [self ConstructGraph2]

}
//ConstructGraph2 uses the same logic to draw the graph and to fetch the results

-(void) ConstructGraph2 { 
        graph2 = [[CPXYGraph alloc] initWithFrame:CGRectZero];
    CPTheme *theme = [CPTheme themeNamed:kCPStocksTheme];
    [graph1 applyTheme:theme];
    mainViewWindow.hostedGraph=graph1;
    .
    .
    .
    .
    .
       myTimer2=[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(graph2Timer:) userInfo:nil repeats:YES];
}

-(void) graph2Timer: (NSTimer *) Timer{
  NSTimeInterval aTimeInterval2 = [[NSDate date]
                                    timeIntervalSinceReferenceDate];
    Get JSON request and add object at every 2 sec, after succesfully fetching

    [graph2data addObject...];

    [graph2 reloadData];
}

- (IBAction)showMainWindow:(id)sender
{
    [self.delegate flipsideViewControllerDidFinish:self];
}

Answer 1

我已经优化了我的示例，将数据获取与主核心图分开，并为数据中的更新添加了NSNotification，我遇到了内存泄漏(http://stackoverflow.com/questions/5927476/yajl-memory-leak-problem)的一些问题。

另外，我对控制器做了以下更改，这样它就不会在每次按下“显示Grpah2”时重新加载整个图形。

if(controller==nil){
    controller=[[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil];
    controller.delegate = self;
    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
}
else{
    controller.delegate = self;
    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
}