Question

I have a view that will draw a chart … there are going to be more than one chart type … How do I wrap them in a factory class? So I have a MyChart class (UIView subclass)… and if the user can do something like :

MyChart *chart = [[Mychart alloc] initWithFrame:frame andType:1];

and chart will actually become a MyLineChart object … or some other object that myChart can create?
Do I just create thouse views in the init of the myChart class .. and return them in stead of returning self?

Answer 1

Pseudo code like this

typedef enum {
    MyChartTypeLine,
    MyChartTypePoint,
    ...
} MyChartType;

MyLineChart *chart = [MyChart chartWithType:MyChartTypeLine];

in MyChart.m add a class method:

+ (id)chartWithType:(MyChartType)type
{
    switch (type) {
        case MyChartTypeLine:
            return [[MyLineChart alloc] init];
        case...
    }
    return nil;
}