UIAlertView到UITableViewController
UIAlertView到UITableViewController
提问于 2012-07-30 15:33:13
当我在UIAlertView上按下'OK‘按钮时，我想让它返回到UITableViewController，但当我点击它时，它不会返回。
QuizViewController.h
@interface QuizViewController : UIViewController <UIAlertViewDelegate> {
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;
@endQuizViewController.m
-(IBAction)buttonWasClicked:(id)sender{
UIButton *resultebutton= (UIButton*)sender;
if (qCount < totalQuestions) {
id prevQuestion = [appDelegate.qs objectAtIndex:qCount-1];
NSString * correctAns = [prevQuestion labelAns];
if ([correctAns isEqualToString:resultebutton.titleLabel.text])
myScore += 5;
NSLog(@"The button title is %@ ", correctAns);
NSLog(@"The button title is %@ ", resultebutton.titleLabel.text);
NSString *finishingStatement = [[NSString alloc] initWithFormat:@"Your score so far is %i!", myScore];
theScore.text = finishingStatement;
id nextQuestion = [appDelegate.qs objectAtIndex:qCount];
quizLbl.text = [nextQuestion labelQn];
headerLbl.text = [nextQuestion labelHeader];
[qBtn setTitle:[nextQuestion labelBtn] forState:UIControlStateNormal];
[qBtnB setTitle:[nextQuestion labelBtnB] forState:UIControlStateNormal];
[qBtnC setTitle:[nextQuestion labelBtnC] forState:UIControlStateNormal];
[qBtnD setTitle:[nextQuestion labelBtnD] forState:UIControlStateNormal];
qCount++;
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Results" message:[[NSString alloc] initWithFormat:@"Your total score will be %i!", myScore]
delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
}
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
QuizTableViewController *quizTable = [self.storyboard instantiateViewControllerWithIdentifier:@"quizTable"];
[self.navigationController presentModalViewController:quizTable animated:YES];
}回答 4
Stack Overflow用户
发布于 2012-07-30 15:37:28
您不应该在.h文件中声明委托方法，如：-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;
取而代之的是在alertView中使用delegate:self，如下所示：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Results" message:[[NSString alloc] initWithFormat:@"Your total score will be %i!", myScore]
delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];并在.h文件中声明如下
@interface QuizViewController : UIViewController<UIAlertViewDelegate>然后单击button.index=0在您的委托方法中使用[self.navigationController presentModalViewController:quizTable animated:YES];。
Stack Overflow用户
发布于 2012-07-30 15:39:35
使用以下命令：
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
if([alertView.title isEqualToString:@"the_title_of_your_alert"]){
//above line is to identify your alert, if you have several ones
if(buttonIndex == 0)
//do this
else if (buttonIndex == 1)
//do that
else if //bla bla bla, find the button, and if it is your "ok" button,
//go to your TableViewController
}
}并且alertView的委托不应该以这种方式声明，只要实现委托方法即可。
Stack Overflow用户
发布于 2012-07-30 15:44:52
没有回调的原因是您将UIAlertView委托设置为nil。需要将其设置为self，以便该对象在警报解除时接收回调：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Results"
message:[[NSString alloc] initWithFormat:@"Your total score will be %i!", myScore]
delegate:self
cancelButtonTitle:@"OK" otherButtonTitles: nil]; 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/11717111
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