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我有一個pageViewController，它將不同的圖像帶到每次滑動的屏幕上。分頁工作與手勢很好。但是，我試圖實現一個按鈕，也做分頁。我在左上角有一個叫做「Back」的按鈕，右上角是一個名爲「Next」的按鈕。我無法使這些按鈕工作。使用按鈕移動pageViewController（objective-c）
注：OnboardingChildViewController是LoginSignUpController
的孩子控制器代碼：
LoginSignUpViewController.m：
#pragma mark - Paging delegate
- (OnboardingChildViewController *)viewControllerAtIndex:(NSUInteger)index {
OnboardingChildViewController *childViewController = [[OnboardingChildViewController alloc] initWithNibName:@"OnboardingChildViewController" bundle:nil];
childViewController.index = index;
return childViewController;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSUInteger index = [(OnboardingChildViewController *)viewController index];
if (index == 0) {
return nil;
}
// Decrease the index by 1 to return
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSUInteger index = [(OnboardingChildViewController *)viewController index];
index++;
if (index == 5) {
return nil;
}
return [self viewControllerAtIndex:index];
}
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
// The number of items reflected in the page indicator.
return 5;
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
// The selected item reflected in the page indicator.
return 0;
}
OnboardingChildViewController.m：
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor clearColor];
switch(self.index)
{
case 0: {
self.dismissButton.hidden = true;
self.onboardingImage.image = nil;
[self.nextButton setTitle:@"Take a Tour" forState:UIControlStateNormal];
self.onboardingDescription.hidden = true;
self.index = 0;
break;
}
case 1: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: @"onboardingImage1.png"];
self.onboardingDescription.text = @"Follow users to see their content in your feed";
self.index = 1;
break;
}
case 2: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: @"onboardingImage2.png"];
self.onboardingDescription.text = @"Listen to Stations based on your interest";
self.index = 2;
break;
}
case 3: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: @"onboardingImage3.png"];
self.onboardingDescription.text = @"Easily Search for Users, Posts, and Stations";
self.index = 3;
break;
}
default: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: @"onboardingImage4.png"];
[self.nextButton setTitle:@"Sign Up" forState:UIControlStateNormal];
self.onboardingDescription.text = @"Post Photos, Videos, Audio, and Live Video to Stations";
self.index = 4;
break;
}
}
}
- (IBAction)backButton:(id)sender {
//NEED TO MOVE PAGEVIEWCONTROLLER BACK.... self.index--?
}
- (IBAction)nextButton:(id)sender {
//NEED TO MOVE PAGEVIEWCONTROLLER FORWARD.... self.index++?
}