不完整的實現 - Xcode警告

Question

我剛開始使用iOS開發，並且由於警告而停滯不前。構建成功，但這個警告正在困擾着我。我查了一些其他的答案，但無法弄清楚什麼是錯的。

華林 - 未完全執行

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

您還沒有實現這些屬性的getter：

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

呦ü可以實現它們：

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

或者讓編譯器爲你做它通過聲明他們作爲頭屬性：

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

而在.m文件：

@synthesize real = _real, imaginary = _imaginary; 

_是實例成員。

Answer 2

你的問題是，你的界面說有real和imaginary方法，但你還沒有實現這些。更重要的是，讓編譯通過定義它們爲屬性合成爲您real和imaginary setter和getter方法，你的代碼被大大簡化：

@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

試試這個，

#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