iphone – 为模态视图控制器数据传输实现委托方法

概述我有一个简单的项目来呈现一个模态视图控制器,并根据按下的模式VC中的哪个按钮传回一个字符串.我基于在iTunes U上观看Stanford课程.我看起来一切都正确,但我得到了一些编译器警告. 首先,我从TransferViewController.m中的不兼容指针类型中得到一个名为’setDelegate：’的传递参数1 其次,我得到四个警告称为无效接收器类型’id< MyModalViewCon 我有一个简单的项目来呈现一个模态视图控制器,并根据按下的模式VC中的哪个按钮传回一个字符串.我基于在iTunes U上观看Stanford课程.我看起来一切都正确,但我得到了一些编译器警告.

首先,我从TransferVIEwController.m中的不兼容指针类型中得到一个名为’setDelegate：’的传递参数1

其次,我得到四个警告称为无效接收器类型’ID< MyModalVIEwControllerDelegate> *’但这些警告不显示在构建结果区域中,而是显示在MyModalVIEwController.m中的违规行旁边,每个按钮 *** 作中都有两行.

这是代码……

//  TransferVIEwController.h#import <UIKit/UIKit.h>#import "MyModalVIEwController.h";@interface TransferVIEwController : UIVIEwController <MyModalVIEwControllerDelegate> {    UILabel *label;    UIbutton *button;}@property (nonatomic,retain) IBOutlet UILabel *label;@property (nonatomic,retain) UIbutton *button;- (IBAction)updateText;@end

//  TransferVIEwController.m#import "TransferVIEwController.h"@implementation TransferVIEwController@synthesize label;@synthesize button;- (IBAction)updateText {    MyModalVIEwController *myModalVIEwController = [[MyModalVIEwController alloc] init];    myModalVIEwController.delegate = self; // I get the warning here.    [self presentModalVIEwController:myModalVIEwController animated:YES];    [myModalVIEwController release];}- (voID)myModalVIEwController:(MyModalVIEwController *)controller dIDFinishSelecting:(Nsstring *)selectedDog {    label.text = selectedDog;    [self dismissModalVIEwControllerAnimated:YES];}@end

//  MyModalVIEwController.h#import <UIKit/UIKit.h>@protocol MyModalVIEwControllerDelegate;@interface MyModalVIEwController : UIVIEwController {    UIbutton *abby;    UIbutton *zion;    ID <MyModalVIEwControllerDelegate> delegate;}@property (assign) ID <MyModalVIEwControllerDelegate> delegate;- (IBAction)selectedAbby;- (IBAction)selectedZion;@end@protocol MyModalVIEwControllerDelegate <NSObject>@optional- (voID)myModalVIEwController:(MyModalVIEwController *)controller dIDFinishSelecting:(Nsstring *)selectedDog;@end

//  MyModalVIEwController.m#import "MyModalVIEwController.h"@implementation MyModalVIEwController@synthesize delegate;- (IBAction)selectedAbby {    if ([self.delegate respondsToSelector:@selector (myModalVIEwController:dIDFinishSelecting:)]) {        [self.delegate myModalVIEwController:self dIDFinishSelecting:@"Abby"];    }}- (IBAction)selectedZion {    if ([self.delegate respondsToSelector:@selector (myModalVIEwController:dIDFinishSelecting:)]) {        [self.delegate myModalVIEwController:self dIDFinishSelecting:@"Zion"];    }}

解决方法 在ID< something>之后摆脱那些* s在代表之前.

所以说吧

ID <MyModalVIEwControllerDelegate> *delegate;

这个

ID <MyModalVIEwControllerDelegate> delegate;

总结

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