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IOS9开发指南之Objective-C接口声明实现与调用_object c 怎么实现接口

object c 怎么实现接口

1.接口声明

  1. @interface Calculator: NSObject
  2. {
  3. double accumulator;
  4. }
  5. -(void) setAccumulator: (double) value;
  6. -(void) clear;
  7. -(double) accumulator;
  8. -(void) add: (double) value;
  9. -(void) subtract: (double) value;
  10. -(void) multiply: (double) value;
  11. -(void) divide: (double) value;
  12. @end

2.接口实现

  1. @implementation Calculator
  2. -(void) setAccumulator: (double) value
  3. {
  4. accumulator = value;
  5. }
  6. -(void) clear
  7. {
  8. accumulator = 0;
  9. }
  10. -(double) accumulator
  11. {
  12. return accumulator;
  13. }
  14. -(void) add: (double) value
  15. {
  16. accumulator += value;
  17. }
  18. -(void) subtract: (double) value
  19. {
  20. accumulator -= value;
  21. }
  22. -(void) multiply: (double) value
  23. {
  24. accumulator *= value;
  25. }
  26. -(void) divide: (double) value
  27. {
  28. accumulator /= value;
  29. }
  30. @end

3.接口调用

  1. Calculator *deskCalc;
  2. deskCalc =
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