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嗨，我目前正在使用 core-plot 绘制动态图并且工作正常，现在我正在考虑在 2 个单独的视图上添加 2 个图

我已经开始使用 Mainview 绘图 Graph-1 和 Flipview 绘图 Graph-2 的“实用程序应用程序”

主视图图形工作正常，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 再次被调用？？？）但是 graph1data只用一个 NSTimer 维护并且工作正常。

我不想释放这些值，因为我想查看具有先前值的图形，例如 Graph1。

有人可以建议如何通过动态数据更新在 2 个单独的 UIview 上实现 2 个核心绘图图吗？我的图形逻辑如下

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];
}
4

1 回答 1

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我通过将数据获取与主核心图分开并添加 NSNotification 以更新数据来优化我的示例，我遇到了一些内存泄漏问题（http://stackoverflow.com/questions/5927476/yajl-memory-泄漏问题）。

此外，我对控制器进行了以下更改，以便每次按下“显示 Grpah2”时它都不会重新加载整个图形。

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];
}
于 2011-05-08T23:06:34.783 回答