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[英]iOS CoreLocation & Singleton pattern: Delegate methods not working
[英]Delegate Pattern ios
我一直在遵循这个示例来帮助我建立代表,但是不幸的是我错过了一些东西,因此对我不起作用。 如何设置一个简单的委托以在两个视图控制器之间进行通信?
我的代码如下所示:
// HintsViewController.h
#import <UIKit/UIKit.h>
@protocol HintDelegateProtocol;
@interface HintsViewController : UIViewController
@property (weak, nonatomic) id<HintDelegateProtocol> hintDelegate;
-(IBAction)showFirstLetter:(id)sender
-(IBAction)showHint:(id)sender;
-(IBAction)showAnswer:(id)sender;
@end
@protocol HintDelegateProtocol <NSObject>
-(void)HintsViewController:(HintsViewController*)hintsViewController
showFirstLetter:(NSString*)firstLetter;
-(void)HintsViewController:(HintsViewController*)hintsViewController
showHint:(NSString*)hint;
-(void)HintsViewController:(HintsViewController*)hintsViewController
showAnswer:(NSString*)answer;
@end
//
// HintsViewController.m
#import "HintsViewController.h"
@implementation HintsViewController
#pragma mark -
#pragma mark IBActions
/ *根据以下建议,我在此处更改了代码/ *
- (IBAction)showHint:(id)sender
{
[self.hintDelegate HintsViewController:self showHint:@"Hint"];
}
- (IBAction)showFirstLetter:(id)sender
{
[self.hintDelegate HintsViewController:self showFirstLetter:@"FirstLetter"];
}
- (IBAction)showAnswer:(id)sender
{
[self.hintDelegate HintsViewController:self showAnswer:@"Answer"];
}
@end
然后在Controller类中,我有以下内容:
//
// GameLogicController.h
#import "HintsViewController.h"
@interface GameLogicController : NSObject < HintDelegateProtocol>
@end
在实现中,我具有以下内容:
// GameLogicController.m
-(void) nextRiddle
{
HintsViewController *hintsViewController = [[HintsViewController alloc] init];
hintsViewController.hintDelegate = self;
}
#pragma mark -
#pragma mark HintsFunctionality
-(void)HintsViewController:(HintsViewController*)hintsViewController
showFirstLetter:(NSString*)firstLetter
{
NSLog(@"Show First Letter called");
}
-(void)HintsViewController:(HintsViewController*)hintsViewController
showHint:(NSString*)hint
{
NSLog(@"show Hint called");
}
-(void)HintsViewController:(HintsViewController*)hintsViewController
showAnswer:(NSString*)answer
{
NSLog(@"Show answer called");
}
使用断点,我可以看到正在调用HintsViewController中的IBAction,但是从未在gameLogicController中的任何委托方法中放置断点。 因此,我错过了在GameLogicController和HintsViewController之间建立连接的重要步骤。 谁能帮我发现它?
假设您有两个文件:一个是ViewController,另一个是ConnectionManager类。
在ConnectionManager类中声明协议及其方法,并在ViewController类中定义协议方法。 通过在ViewController类中设置ConnectionManager类的委托,可以调用Protocol方法。
@protocol ConnManagerDelegate<NSObject>
- (void)didReceiveData:(NSDictionary *)data;
- (void)didFailWithError:(NSError*)error;
@end
@interface ConnectionManager : NSObject<NSURLConnectionDelegate>
@property(nonatomic,assign)id< ConnManagerDelegate > delegate;
在同一文件.m中的其他地方,当您的响应出现时,只需调用
[Self.delegate didReceiveData:mDict];
在分配初始化ConnectionManager类后,在ViewController文件中,将其委托设置为self并定义协议方法。 正是这些方法,您将获得ConnectionManager类的响应。
这就是所有协议委托模式
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