如何將此代碼從Swift轉換爲Objective C

Question

private var distance: Double { 
    return fabs(max - min) 
} 

如何在Objective C語言中定義此變量。

Answer 1

在您.m文件：

@interface MyClass() 
@property (nonatomic, assign, readonly) double distance; 
@end 

@implementation MyClass 

-(double)distance { 
    return fabs(max - min); 
} 

@end