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一、设计一个K线类

1）最低价格（可读写（get,set)）

1、KLine.h

#import 
   
    @interface KLine : NSObject{
       @public    float _highPrice;    float _lowPrice;    float _avgPrice;}-(void)setHighPrice:(float) heighPrice;-(float) getHighPrice;-(void)setLowPrice:(float) lowPrice;-(float) getLowPrice;-(float) getAvgPrice;@end
   

2、KLine.m

#import "KLine.h"@implementation KLine-(void)setHighPrice:(float) heighPrice{    _highPrice = heighPrice;    _avgPrice =(_lowPrice + _highPrice)/2;}-(float) getHighPrice{    return _highPrice;}-(void)setLowPrice:(float) lowPrice{    _lowPrice = lowPrice;    _avgPrice =(_lowPrice + _highPrice)/2;}-(float) getLowPrice{    return _lowPrice;}-(float) getAvgPrice{    //return (_lowPrice + _highPrice)/2;    return _avgPrice;}@end

3、main.h:

#import 
   
    #import "KLine.h"int main(int argc, const char * argv[]){    @autoreleasepool {        KLine *kline = [KLine new];        [kline setHighPrice:30.0f];        [kline setLowPrice:20.0f];        float avg = [kline getAvgPrice];        NSLog(@"avg = %.2f",avg);    }    return 0;}
   

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