我有一个部分碱基类RNChartBaseView(协议和延伸),和亚类等RNLineChartView,RNBarChartView等协议扩展不适用于RCT_EXPORT_VIEW_PROPERTY?
RNChartBaseView.swift
protocol RNChartBaseView {
associatedtype T: ChartViewBase;
associatedtype U: ChartDataEntryBase;
var chart: T { get }
func createEntries(_ data: NSDictionary) -> [U];
func setData(_ data: NSDictionary);
}
extension RNChartBaseView {
func setData(_ data: NSDictionary) {
let chartData = createEntries(data);
chart.data = chartData;
}
}
RNLineChartView.swift
class RNLineChartView : UIView, RNChartBaseView{
let _chart:LineChartView;
var chart: LineChartView {
return _chart
}
override init(frame: CGRect) {
self._chart = LineChartView(frame: frame);
super.init(frame: frame);
self.addSubview(_chart);
}
func createEntries(_ data: NSDictionary) -> [LineDataEntry] {
// ....... convert to LineDataEntry array.
return entries;
}
}
RNLineChartViewManagerSwift的一堆.swift
@objc(RNLineChartViewManagerSwift)
class RNLineChartViewManagerSwift: RCTViewManager {
override func view() -> UIView! {
let ins = RNLineChartView()
return ins;
}
}
RNLineChartViewManager.m
#import "React/RCTViewManager.h"
@interface RCT_EXTERN_MODULE(RNLineChartViewManagerSwift, RCTViewManager)
RCT_EXPORT_VIEW_PROPERTY(data, NSDictionary)
@end
,但我得到
[reactNativeCharts.RNLineChartView setData:]: unrecognized selector sent to instance 0x7fdf60e04510'
,如果我从扩展RNLineChartView.swift复制使用setData,每一件事工作正常。
问题在哪里?
更新
看起来基类是必要的。
但下面的代码不是优雅的,如何以正确的方式编写它?
RNChartBaseViewClass
class RNChartBaseViewClass: UIView, RNChartBaseView {
var chart: ChartViewBase {
fatalError("subclass should override this function.")
};
override init(frame: CGRect) {
fatalError("subclass should override this function.")
}
func createEntries(_ data: NSDictionary) -> [BaseChartDataEntry] {
fatalError("subclass should override this function.")
}
func setData(_ data: NSDictionary) {
let chartData = createEntries(data);
chart.data = chartData;
}
}
RNLineChartView.swift
class RNLineChartView : RNChartBaseViewClass{
var _chart : LineChartView;
override var chart: LineChartView {
return _chart
}
override init(frame: CGRect) {
self._chart = LineChartView(frame: frame);
super.init(frame: frame);
self.addSubview(_chart);
}
override func createEntries(_ data: NSDictionary) -> [BaseChartDataEntry] {
// I have to use [BaseChartDataEntry] here as return type to pass compile,
// although it actually is [LineDataEntry], it may cause further problems, e.g.
// ....... convert to LineDataEntry array.
return entries;
}
}
更新
最后,我用的延伸和子类的组合。
模板代码是扩展名。而在RNChartBaseViewClass
class RNChartViewBaseClass: UIView, RNChartViewBase {
......
func setData(_ data: NSDictionary) {
(self as RNChartViewBase).setData(data)
}
}
UIView的子类带来了一个新问题。 如果我创建UIView的子类并在那里声明setData方法。在setData中,有'chart.data = chartData',但图表是通用类型, 我只能在具体的RNLineChartView/RNBarChartView中初始化'chart', 如何解决这个问题? –
如果我正确理解你,你可以在父类中声明setData,并在具有类型的子类中覆盖方法。 –
我更新了一些问题,在那里添加我的基类。我对这个基础班不太满意,你能帮我改进吗? –