Question

我尝试一个简单的委托，但该方法不会触发。这是我的代码：使用协议的视图和应该触发委托的按钮： ViewController.h

#import <UIKit/UIKit.h>
@protocol InitStackDelegate <NSObject>
@required
-(void)initstack:(NSInteger)amount;
@end

@interface ViewController : UIViewController{
    IBOutlet UITextField *amountTextField;
    __unsafe_unretained id<InitStackDelegate> delegate;
}

- (IBAction)init:(id)sender;

@property (nonatomic,assign)id  delegate;

@end

ViewController.m

#import "ViewController.h"


@interface ViewController ()

@end

@implementation ViewController
@synthesize delegate;
- (IBAction)init:(id)sender {
    //send the delegate

    [delegate initstack:[amountTextField.text intValue]];

}

AppDelegate.h

#import <UIKit/UIKit.h>
#import "ViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate,InitStackDelegate> {
}  

@property (strong, nonatomic) UIWindow *window;
@property (strong,nonatomic) ViewController *myView;
@end

AppDelegate.m

#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window;
@synthesize myView;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    //..... push second controller into navigation stack
    myView.delegate = self;
    return YES;
}
...
#pragma mark Delegate Method
-(void)initstack:(NSInteger)amount{
    NSInteger test;
}

@end

当我按下按钮时，我会进入（IBAction）init，但代表什么都不做。我在AppDelegate.m中设置了一个断点，但它永远不会到达。有什么帮助吗？

THX 马里奥

Answer 1

在你的App Delegate中，当你设置myView.delegate = self时，myView实际上并没有指向任何东西！您需要将myView设置为指向ViewController。

在didFinishLaunchingWithOptions

中使用此功能

myView = (ViewController *)self.window.rootViewController;
myView.delegate = self;

ios代表不会开火

1 个答案: