相关疑难解决方法(0)

我刚刚开始学习目标C,我真的很困惑.h和.m文件是如何相互作用的.这个简单的程序有3个文件:

Fraction.h

 #import <Foundation/NSObject.h>
    @interface Fraction : NSObject {
        int numerator;
 int denominator;
    }
    - (void) print;
    - (void) setNumerator: (int) n;
    - (void) setDenominator: (int) d;
    - (int) numerator;
    - (int) denominator;
    @end

Fraction.m

 #import "Fraction.h"
    #import <stdio.h>
    @implementation Fraction
    -(void) print { printf( "%i/%i", numerator, denominator ); }
    -(void) setNumerator: (int) n { numerator = n; }
    -(void) setDenominator: (int) d { denominator = d; }
    -(int) denominator { return denominator; }
    -(int) numerator { return numerator; } …

每个UIViewController,以rootViewController开头,使用[self.navigationController pushViewController nextView]来推送新视图.滑动工作正常.

如何向前滑动实现相同的行为？我更确切地说,如何在弹出后退或后退按钮后保持UIViewController,所以我可以再次添加它以防止向前滑动？