[英]Delegate method is not fired- iOS
我有一個tabcontroller,它有兩個部分。 其中一個是UserInfo,另一個是UserAvatar。 一旦用戶輸入了自己的信息,然后單擊“完成”按鈕進入主視圖,或者用戶也可以選擇其個人資料頭像,然后單擊“單擊”按鈕然后進入主視圖。 但是,盡管我以調試模式通過代碼運行,但是它運行到完成按鈕中,但是在我的userinfo視圖中,不會觸發delegeta方法!
在我的主頭文件中,我聲明我的協議如下:
@protocol MyUserInfoAvatarViewControllerDelegate <NSObject>
@required
-(void)userInfoEditingDone:(id)sender;
@end
@protocol MyUserInfoSettingsViewControllerDelegate <NSObject>
@required
-(void)userInfoEditingDone:(id)sender;
@end
在我的main.m文件中,我的委托方法
- (void)userInfoEditingDone:(id)sender {
NSLog(@"Hello");
}
MyUserInfoAvatarViewController.h
#import <UIKit/UIKit.h>
#import "NEATMainViewController.h"
@interface UserInfoAvatarViewController : UIViewController <ThumbImageViewDelegate > {
id __unsafe_unretained flipDelegate;
}
@property (nonatomic,unsafe_unretained) id <MyUserInfoAvatarViewControllerDelegate>
flipDelegate; 在以下響應中MyUserInfoAvatarViewController.m
- (IBAction)doneButtonPressed:(id)sender {
// Tell the root view to flip back over to the main view
[self.flipDelegate userInfoEditingDone:self];
}
MyUserInfoSettingsViewController.h
#import <UIKit/UIKit.h>
#import "NEATMainViewController.h"
@interface UserInfoSettingsViewController : UIViewController {
id __unsafe_unretained flipDelegate;
}
@property (nonatomic,unsafe_unretained) id <MyUserInfoSettingsViewControllerDelegate> flipDelegate;
在下面不調用我的委托方法。.MyUserInfoSettingsViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(done:)];
self.navigationItem.rightBarButtonItem = btn;
}
- (void)done:(id)sender {
// Tell the root view to flip back over to the main view
[self.flipDelegate userInfoEditingDone:self];
}
這是因為您的flipDelegate
nil
,而且您在main.m
定義了委托方法,我認為它沒有任何實現您協議的類。
檢查你錯過了。 例如,應該這樣說WeatherAPI
class:
@protocol WeatherAPIDelegate <NSObject>
-(void)weatherData:(NSMutableDictionary *)dictData;
@end
@interface WeatherAPI : NSObject
{
id <WeatherAPIDelegate>delegate;
}
@property(nonatomic,strong)id <WeatherAPIDelegate> delegate;
@end
在WeatherAPI
調用這樣的delegate
方法:
[delegate weatherData:dictWeatherInfo];
現在在說ViewController
實現:
@interface ViewController : UIViewController<WeatherAPIDelegate>
{
}
在ViewController
實現WeatherAPIDelegate
方法:
#pragma mark -
#pragma mark WeatherAPIDelegate Method
-(void)weatherData:(NSMutableDictionary *)dictData
{
}
在ViewController
初始化WeatherAPI
時
WeatherAPI *objWeatherAPI = [[WeatherAPI alloc]init];
[objWeatherAPI setDelegate:self];
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