动态谷歌图表

Question

好吧，我得到了这个代码：

NSLog(@"button pressed");
    NSString* myurl=@"http://chart.apis.google.com/chart?chf=bg,s,67676700&chs=300x225&cht=p&chd=s:Uf9a&chdl=30°|40°|50°|60°";
    NSString *theurl=[myurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:theurl] cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                        timeoutInterval:60.0];                                              

    NSURLResponse* response;
    NSError* error;
    NSData *imageData=[NSURLConnection sendSynchronousRequest:theRequest returningResponse:&response error:&error];
    NSLog(@"%@",error); 
    NSLog(@"%@",response);
    NSLog(@"%@",imageData); 

    UIImage *myimage = [[UIImage alloc] initWithData:imageData];

    graphimage.image=myimage;   

那里没什么特别的...... 但是当我请求网址时： http://chart.apis.google.com/chart?chf=bg,s,67676700&chs=300x225&cht=p&chd=s:Uf9a&chdl=30° |40°|50°|60°

它要求像 30/40/50 这样的度数...但我想要值而不是我从数据库中获得的学位......我该怎么做？

Answer 1

您只需要从数据库中获取学位并将其存储在集合中。然后您将能够循环该集合并将它们添加到字符串中。

//Get Degrees from database, store them in an array of NSNumbers
...
//Pretend these are from a db
NSArray *degreesFromDatabase = [NSArray arrayWithObjects:
                                    [NSNumber numberWithInt:35],
                                    [NSNumber numberWithInt:50],
                                    [NSNumber numberWithInt:25],
                                    [NSNumber numberWithInt:72],
                                    nil];
    //URL with all static content
    NSMutableString *myurl = [NSMutableString stringWithString:@"http://chart.apis.google.com/chart?chf=bg,s,67676700&chs=300x225&cht=p&chd=s:Uf9a&chdl="];

    int count = [degreesFromDatabase count];

    for(NSUInteger i = 0; i < count; ++i)
    {
        NSNumber *degree = [degreesFromDatabase objectAtIndex:i];
        [myurl appendFormat:@"%@%%C2%%B0", degree];
        if(i < count - 1)
            [myurl appendString:@"|"];
    }

Answer 2

我编写了一个函数，它接收所有必要的参数，创建一个谷歌图表并将其转换为 UIImage。

这里是：

-(UIImage )生成GoogleChartImage:(NSString)标题

 xAxis:(NSArray*)axisXLabels
                          yAxis:(NSArray*)axisYLabels
                        andData:(NSArray*)dataValues
                          颜色:(NSString*)线条颜色
                     图表宽度:(NSNumber*)宽度
                     图表高度:(NSNumber*)高度
                    lagendLabel:(NSString*)图例
                       minScale:(NSNumber*)minScale
                       maxScale:(NSNumber*)maxScale{

NSMutableString *myurl = [NSMutableString stringWithString:@"http://chart.googleapis.com/chart?chxl=0:|"];


//axisX标签
int countAxisXLabels = [axisXLabels 计数];

for(NSUInteger i = 0; i < countAxisXLabels; ++i)
{
    NSNumber *value = [axisXLabels objectAtIndex:i];
    [myurl追加格式:@"%@",值];
    if(i < countAxisXLabels - 1)
        [myurl追加字符串：@“|”];
}

[myurlappendString:@"|1:|"];


//axisY标签
 int countAxisYLabels = [axisYLabels 计数];
for(NSUInteger i = 0; i < countAxisYLabels; ++i)
{
    NSNumber *value = [axisYLabels objectAtIndex:i];
    [myurl追加格式:@"%@",值];
    if(i < countAxisYLabels - 1)
        [myurl追加字符串：@“|”];
}

[myurl appendString:@"&chxr=0,0,105|1,3.333,100&chxt=x,y&chs="];

//尺寸
[myurl appendFormat:@"%@x%@&cht=lc&chd=t:", 宽度,高度];

//数据值
int countDataValues = [数据值计数];

for(NSUInteger i = 0; i < countDataValues; ++i)
{
    NSNumber *value = [dataValues objectAtIndex:i];
    [myurl追加格式:@"%@",值];
    if(i < countDataValues - 1)
    [myurl 附加字符串：@","];
}

//传奇
[myurl appendFormat:@"&chdl=%@&chg=25,50&chls=2&",图例];

//颜色
[myurl appendFormat:@"chm=o,%@,0,-2,8&chco=%@",lineColor,lineColor];

//标题
[myurl appendFormat:@"&chtt=+%@",标题];

//规模
[myurl appendFormat:@"&chds=%@,%@",minScale,maxScale];



NSString *theurl=[myurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:theurl]

缓存策略：NSURLRequestUseProtocolCachePolicy
超时间隔:60.0];

NSURLResponse* 响应；
NSError* 错误；
NSData *imageData=[NSURLConnection sendSynchronousRequest:theRequest returnedResponse:&response

错误：&错误];
NSLog(@"%@",错误);
NSLog(@"%@",响应);
NSLog(@"%@",imageData);

UIImage *myimage = [[UIImage alloc] initWithData:imageData];


返回我的图像；

// 图表向导：https://developers.google.com/chart/image/docs/chart_wizard
 }

这是测试函数：

-（无效）测试{

NSString* title = @"身高历史记录";
NSArray *axisXLabels = [NSArray arrayWithObjects:
                       @“一月”，
                       @“二月”，
                       @“三月”，
                       @“君”，
                       @“七月”，
                       @“八月”，
                       零];


NSArray *axisYLabels = [NSArray arrayWithObjects:
                        [NSNumber numberWithInt:0],
                        [NSNumber numberWithInt:50],
                        [NSNumber numberWithInt:150],
                        [NSNumber numberWithInt:200],
                        零];

NSArray *dataValues = [NSArray arrayWithObjects:
                       [NSNumber numberWithInt:130],
                       [NSNumber numberWithInt:140],
                       [NSNumber numberWithInt:140],
                       [NSNumber numberWithInt:150],
                       [NSNumber numberWithInt:170],
                       [NSNumber numberWithInt:180],
                       零];

NSString *lineColor = @"FF9900";

NSNumber *宽度 = [NSNumber numberWithInt:300];

NSNumber *hight = [NSNumber numberWithInt:200];

NSNumber *minScale = [NSNumber numberWithInt:0];

NSNumber *maxScale = [NSNumber numberWithInt:200];

NSString *legendLabel = @"cm";

UIImage *myimage =[self ProduceGoogleChartImage:title xAxis:axisXLabels yAxis:axisYLabels andData:dataValues color:lineColor

chartWidth:图表宽度chartHight:高度lagendLabel:legendLabel
minScale:minScale maxScale:maxScale];

_chartImage.image=myimage;

}

，就像问题中的图像一样。