ios - 使用不兼容类型 float 的表达式初始化 "breuk *__strong"

Question

我检查了几个建议的链接，但没有找到答案。我想将两个浮点值传递给对象 breuk 的初始化。该对象有一个初始化方法initwithTeller: (float) mijnTeller 和Noemer: (float) mijnNoemer。该方法还返回一个浮点商。

首先，我在使用不兼容类型 float 的表达式初始化 __strong 时遇到错误。它在方法 berekenQuotient 中对象 breuk 的初始化时给出。

我还想知道是否有必要在 breuk.h 中声明属性 mijnTeller 和 mijnNoemer，因为它们是通过 berekenQuotient 传递下来的。 TX!

代码:

viewcontroller.h:

   #import <UIKit/UIKit.h>
   #import "breuk.h"

   @interface ViewController : UIViewController
   @property (strong, nonatomic) IBOutlet UITextField *tellerVeld1;
   @property (strong, nonatomic) IBOutlet UITextField *noemerVeld1;
   @property (strong, nonatomic) IBOutlet UILabel *quotientVeld;


   - (IBAction)berekenQuotient:(id)sender;
   @end

viewcontroller.M

   #import "ViewController.h"

   @interface ViewController ()

   @end

   @implementation ViewController
   @synthesize tellerVeld1;
   @synthesize noemerVeld1;
   @synthesize quotientVeld;


  - (void)viewDidLoad
  {
     [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
  }

  - (void)didReceiveMemoryWarning
  {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
   }

  - (IBAction)berekenQuotient:(id)sender {
    float teller = [tellerVeld1.text floatValue];
    float noemer = [noemerVeld1.text floatValue];
    breuk *breuk1 = [[breuk alloc]initWithTeller:teller andNoemer:noemer];


    //float quotient = [tellerVeld1.text floatValue]/[noemerVeld1.text floatValue];
    //quotientVeld.text = [[NSString alloc]initWithFormat:@"%.2f", quotient];

   }
   @end

布鲁克.h

  #import <Foundation/Foundation.h>

  @interface breuk : NSObject
  @property float mijnTeller;
  @property float mijnNoemer;
  @property float quotient;



  - (float) initWithTeller: (float) mijnTeller andNoemer:(float) mijnNoemer;
   @end

布鲁克.m

   #import "breuk.h"

   @implementation breuk
   @synthesize mijnTeller;
   @synthesize mijnNoemer;
   @synthesize quotient;


   - (float)initWithTeller:(float)mijnTeller andNoemer:(float)mijnNoemer{
      return quotient = mijnTeller/mijnNoemer;

 }

 @end

Answer 1

您的 init 方法没有完成它的工作。试试这个:

@interface Breuk : NSObject {
    float _mijnTeller;
    float _mijnNoemer;
}
@property float mijnTeller;
@property float mijnNoemer;

- (id)initWithTeller:(float)mijnTeller
           andNoemer:(float)mijnNoemer;
- (float)quotient;
@end

@implementation Breuk 
@synthesize mijnTeller = _mijnTeller;
@synthesize mijnNoemer = _mijnNoemer;

- (id)initWithTeller:(float)mijnTeller
           andNoemer:(float)mijnNoemer {
    self = [super init];
    if (self) {
        _mijnTeller = mijnTeller;
        _mijnNoemer = mijnNoemer;
    }
    return self;
}

- (float)quotient {
    return mijnTeller / mijnNoemer;
}

@end