调用另一个类的方法（例如通过singleton类）？

Question

我使用this简单教程来创建我的单例类。一切正常。有一件事在教程中没有说，如何在该类中创建方法，所以我可以从其他类（例如其他ViewControllers或AppDelegate）访问它们。

我该怎么办？ 非常感谢提前！

Answer 1

您将像在任何其他Objective-C文件中一样定义方法。为公共方法的标头添加一个定义，然后在实现（.m）文件中实现它们。

#import <foundation/Foundation.h>

@interface MyManager : NSObject {
    NSString *someProperty;
}

@property (nonatomic, retain) NSString *someProperty;

+ (id)sharedManager;

//Add instance methods for your singleton here
- (void)someSingletonMethod;

@end

用法：

[[MyManager sharedManager] someSingletonMethod];

Answer 2

singleton .h文件

#import <Foundation/Foundation.h>
 @interface SingleTon : NSObject
{
  NSString *sum;

}

+(SingleTon *) createSingleTon;
-(NSString *) sumOfTwoNumbers:(NSString *) numOne :(NSString *)numTwo;
@end

singleton .m文件

#import "SingleTon.h"

@implementation SingleTon

+(SingleTon *) createSingleTon
{
    static SingleTon *single= nil;
    if (single == nil) {

        single = [[SingleTon alloc] init];
    }
    return single;
}

-(NSString *) sumOfTwoNumbers:(NSString *) numOne :(NSString *)numTwo
{
    sum =  [NSString stringWithFormat:@"%d",[numOne intValue] + [numTwo intValue]];
    return sum;
}

@end

viecontroller.h文件

#import <UIKit/UIKit.h>
#import "SingleTon.h"
@interface ViewController : UIViewController
{
    SingleTon *sing;
    IBOutlet UITextField *one,*two,*sum;
}
-(IBAction)sum:(id)sender;
@end

viecontroller.m文件

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    sing = [SingleTon createSingleTon];
    // Do any additional setup after loading the view, typically from a nib.
}

-(IBAction)sum:(id)sender
{
    sum.text = [sing sumOfTwoNumbers:one.text :two.text];

}
@end

O / P

Answer 3

为你的第一堂课制作一个类方法。也在.h文件中声明它。

+(FFMainVC *)sharedSingleton
{
    static FFMainVC *instance = nil;

    if(instance == nil)
        instance = [[FFMainVC alloc]init];

    return instance;
}
// write your method that you wants to access from other class. also declare this in .h as well

-(void)showCartView
{ 
       // Your Code
}  
// make call of your method from second class like this
[[FFMainVC sharedSingleton]showCartView];