可可觸摸核心散點圖不顯示iOS

-1

我想在我的iphone應用程序中顯示線圖。我被建議核心情節是一個很好的開源庫。所以我試着用它顯示非常基本的圖形，但圖形沒有顯示出來，只有黑屏出來。以下是我使用可可觸摸核心散點圖不顯示iOS

ChartViewController.h代碼

#import <UIKit/UIKit.h> 
#import "CorePlot-CocoaTouch.h" 


@interface ChartViewController : UIViewController<CPTPlotDataSource> 

@end

ChartViewController.m

#import "ChartViewController.h" 

CPTXYGraph *graph; 
CPTGraphHostingView *graphHost; 
CPTScatterPlot *dataSourceLinePlot; 
NSMutableArray *xdata; 
NSMutableArray *ydata; 

@implementation ChartViewController 

- (id)init{ 
    self = [super initWithNibName:nil bundle:nil]; 
    return self; 
} 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    [self initializeData]; 
    NSLog(@"viewdidloaded with number of records= %i",xdata.count); 
    graph = [[CPTXYGraph alloc]initWithFrame:self.view.bounds]; 

    graphHost = [[CPTGraphHostingView alloc]initWithFrame:self.view.bounds]; 

    dataSourceLinePlot = [[CPTScatterPlot alloc] initWithFrame:graph.bounds]; 
    dataSourceLinePlot.identifier  = @"Data Source Plot"; 
    dataSourceLinePlot.dataSource = self; 

    [graph addPlot:dataSourceLinePlot]; 
    graphHost.hostedGraph = graph; 

    self.view = graphHost; 
} 

- (void)initializeData{ 
    xdata = [[NSMutableArray alloc]init]; 
    ydata = [[NSMutableArray alloc]init]; 
    for(int i=0;i<4;i++){ 
     [xdata addObject:[NSNumber numberWithInt:i]]; 
     [ydata addObject:[NSNumber numberWithInt:i*5]]; 
    } 
} 

- (NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot { 
    NSUInteger count = (NSUInteger)[xdata count]; 
    NSLog(@"inside number of recordsfor plot"); 
    return count; 
} 

- (NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { 
    NSDecimalNumber *num = nil; 
    num = (NSDecimalNumber *)[NSNumber numberWithInteger:index]; 
    NSLog(@"inside number for plot"); 
    return num; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

@end

我會很感激，如果有人可以幫我這個問題，因爲我這個環境是新的。謝謝

來源

2013-03-01 Anurag

使託管視圖（graphHost）成爲self.view的子視圖而不是替換它。

來源

2013-03-02 01:31:31

嗨eric，解決了這個問題。我不得不添加這一行 self.view.backgroundColor = [UIColor whiteColor]; 我猜默認背景是黑色的，情節的顏色也是黑色的，這就是爲什麼整個屏幕看起來都是黑色的。愚蠢的錯誤 – Anurag 2013-03-02 12:51:36

andcourse，我也不得不添加託管視圖作爲子視圖謝謝 – Anurag 2013-03-02 13:00:29

可可觸摸核心散點圖不顯示iOS

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