Question

我刚刚开始使用iOS开发，并且由于警告而有点卡住了。构建成功但这个警告困扰着我。我检查了一些其他的答案，但无法弄清楚出了什么问题。

Waring - 不完整的实施

Complexnumbers.h

#import <Foundation/Foundation.h>

@interface ComplexNumbers : NSObject

-(void) setReal: (double)a;
-(void) setImaginary: (double)b;
-(void) print; // display as a + bi

-(double) real;
-(double) imaginary;

@end

Complexnumbers.m

#import "ComplexNumbers.h"

@implementation ComplexNumbers  // Incomplete implementation

{
double real;
double imaginary;
}

-(void) print
{
    NSLog(@"%f + %fi",real,imaginary);
}
-(void) setReal:(double)a
{
    real = a;
}
-(void) setImaginary:(double)b
{
    imaginary = b;
}

@end

Answer 1

您的问题是您的界面显示有real和imaginary方法，但您尚未实施这些方法。更好的是，让编译通过将它们定义为属性来合成real和imaginary setter和getter方法，并且代码大大简化：

@interface ComplexNumbers : NSObject

@property (nonatomic) double real;
@property (nonatomic) double imaginary;

-(void) print; // display as a + bi

@end

和

@implementation ComplexNumbers

-(void) print
{
    NSLog(@"%f + %fi", self.real, self.imaginary);
}

@end

Answer 2

您尚未实现这些属性getter：

-(double) real;
-(double) imaginary;

您可以实施它们：

-(double) real { return _real; }
-(double) imaginary { return _imaginary; }

或者让编译器通过在标题中将它们声明为属性来为您执行此操作：

@property(nonatomic) double real;
@property(nonatomic) double imaginary;

在.m文件中：

@synthesize real = _real, imaginary = _imaginary;

_是实例成员。

Answer 3

试试这个，

#import "ComplexNumbers.h"

@implementation ComplexNumbers  // Incomplete implementation

{
double real;
double imaginary;
}

-(void) print
{
  NSLog(@"%f + %fi",real,imaginary);
}

-(void) setReal:(double)a
{
real = a;
 }
-(void) setImaginary:(double)b

{
imaginary = b;
}
 -(double) real
{
   return real;
}
-(double) imaginary
{
   return imaginary;
}

@end

不完整的实现 - Xcode警告

3 个答案: