从 xcode 中的同一个 class 调用方法

Question

我想调用方法 "shows()" 但为什么我收到 "expected identifier or ( " 和 "use of undeclared identifier self"

的错误

ViewController.m

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    NSDictionary *inventory;
}
- (void)shows;
@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
inventory = @{@"Rahul":[NSNumber numberWithInt:11],
              @"iOS":[NSNumber numberWithInt:22]};
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

  - (void)shows
    {
      NSLog(@"%@",inventory);
    }


     [self shows];
@end

Answer 1

你必须把代码放在另一个方法中，它不能自己打开。

将其放入您的 viewDidLoad: 方法或其他地方

Answer 2

你不能在外面调用这个方法。您可以在另一个方法中调用它。就像你可以在 ViewDidLoad.

中调用这个方法

 - (void)viewDidLoad { 
       [super viewDidLoad];    
       [self shows];   
 }

Answer 3

您不能在 class 范围内调用 [view shows];，您需要在方法中调用它，例如 viewDidLoad 像这样称呼它：

- (void)viewDidLoad {
      [super viewDidLoad];
      inventory = @{@"Rahul":[NSNumber numberWithInt:11],
          @"iOS":[NSNumber numberWithInt:22]};
      // Do any additional setup after loading the view, typically from a nib.
      [self shows];//SHOWS call moved here...

}

从 xcode 中的同一个 class 调用方法

calling a method from same class in xcode

objective-c

ios

xcode6