不完整的实现 - Xcode警告

Question

我刚开始使用iOS开发，并且由于警告而停滞不前。构建成功，但这个警告正在困扰着我。我查了一些其他的答案，但无法弄清楚什么是错的。

华林 - 未完全执行

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

您还没有实现这些属性的getter：

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

呦ü可以实现它们：

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

或者让编译器为你做它通过声明他们作为头属性：

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

而在.m文件：

@synthesize real = _real, imaginary = _imaginary; 

_是实例成员。

Answer 2

你的问题是，你的界面说有real和imaginary方法，但你还没有实现这些。更重要的是，让编译通过定义它们为属性合成为您real和imaginary setter和getter方法，你的代码被大大简化：

@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 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