Question

我有一个UIActionSheet，我可以从我的应用程序中的UIBarButtonItem成功调用。但是，当我单击UIActionSheet上的一个按钮时，我试图调用它的方法似乎没有被调用，并且UIActionSheet消失了。我的相关代码如下所示：

在我的MapViewController.h文件中：

@interface MapViewController : UIViewController<MKMapViewDelegate, UIActionSheetDelegate>{

在我的MapViewController.m文件中：

-(IBAction)showActionSheet {
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Share your favourite restaurant with your friends" delegate:nil cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"EMail",@"Facebook",@"Twitter",nil];
[actionSheet showInView:self.view];
[actionSheet release];
}

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if(buttonIndex == 0)
    NSLog(@"You chose email!");
if(buttonIndex == 1)
    NSLog(@"You chose facebook!");
if(buttonIndex == 2)
    NSLog(@"You chose twitter!");
}

谁能看到我哪里出错了？我个人的预感是它可能与我如何实现UIActionSheetDelegate接口有关。

Answer 1

你传递nil作为委托，但委托是你的视图控制器，所以传递自己：

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Share your favourite restaurant with your friends" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"EMail",@"Facebook",@"Twitter",nil];

Answer 2

您可能忘记设置代理，在代码中添加以下内容

actionSheet.delegate = self ;

来自文档...... 接收方的代表，如果没有代表，则为零。

@property(nonatomic, assign) id<UIActionSheetDelegate> delegate

Answer 3

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Share your favourite restaurant with your friends" delegate:nil cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"EMail",@"Facebook",@"Twitter",nil];

应该是

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Share your favourite restaurant with your friends" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"EMail",@"Facebook",@"Twitter",nil];

并确保您的.h文件实现UIActionSheetDelegate协议

从UIActionSheet按下按钮后需要帮助调用方法

3 个答案: