我一直在关注这个例子,以帮助我建立一个代表但不幸的是我错过了一些东西,所以它不适合我。 How do I set up a simple delegate to communicate between two view controllers?
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
/ *根据下面的建议,我在这里更改了代码/ *
- (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
在实施中,我有以下内容:
// 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IBActions,但是在gameLogicController中的任何委托方法中放置断点都不会被命中。所以我错过了设置GameLogicController和HintsViewController之间连接的重要一步。谁能帮我发现它?
答案 0 :(得分:0)
假设您有两个文件:一个是您的ViewController,另一个是您的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;
并且在同一个文件.m中,当你的回复刚来电时
[Self.delegate didReceiveData:mDict];
在分配init ConnectionManager类之后的ViewController文件中,将其委托设置为self并定义协议方法。通过这些方法,您将获得ConnectionManager类的响应。
这是所有协议委派模式