自動的UIScrollView分頁

Question

我啓用了分頁一個UIScrollView。不過，我希望這個滾動視圖在一定的時間過去後向右滾動。有沒有簡單的方法來實現這一點，或者我需要使用計時器和編程滾動scrollview？

事情是這樣的網站在其頭：http://denederlandsewateren.nl/ [注意文本「德荷屬Wateren」改變每個x秒]

Answer 1

身上找到這個計算器

[scrollView setContentOffset:CGPointMake(x, y) animated:YES]; 

要使用的UIScrollView做幻燈片，你將所有圖像排列在滾動視圖中，設置一個重複的定時器，然後-setContentOffset：animated：定時器啓動時。

Answer 2

你需要一點點的方法來幫助您滾動到確切的頁面，這沒有實現，但它是非常簡單的，讓我們假設你的滾動視圖被稱爲myScrollview

這是假設你橫向滾動，你可以切換代碼以滿足您的需求

-(void)scrollToPage:(NSInteger)aPage{ 
    float myPageWidth = [myScrollView frame].size.width; 
    [myScrollView setContentOffset:CGPointMake(aPage*myPageWidth,y) animated:YES]; 
} 

然後你設置一個計時器來調用這個方法每5秒例如，像這樣：

[[NSTimer scheduledTimerWithTimeInterval:5 
            target:self 
           selector:@selector(scrollPages) 
           userInfo:Nil 
           repeats:YES] fire]; 

下一步是創建將由計時器被解僱，滾動到下一個頁面的方法，我把它叫做-(void)scrollPages，它也需要你有兩個全局變量稱爲currentPage和numberOfPages，都是類型的NSInteger

-(void)scrollPages{ 
    [self scrollToPage:currentPage%numberOfPages]; 
    currentPage++; 
} 

如果事情沒有意義讓我知道！

Answer 3

在您的.h文件中實現滾動視圖的委託方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{ 
NSInteger scrollIndex = (NSInteger)(self.sliderScrollView.contentOffset.x/self.sliderScrollView.frame.size.width); 
self.sliderPageControll.currentPage = scrollIndex; 
self.currentPageIndexString = [NSString stringWithFormat:@"%ld",(long)self.sliderPageControll.currentPage]; 
} 

這裏後，在您的.m文件

[self.sliderScrollView setPagingEnabled:YES]; 
[self.sliderScrollView setBounces:NO]; 
[self.sliderScrollView setAlwaysBounceVertical:NO]; 
[self.sliderScrollView setShowsHorizontalScrollIndicator:NO]; 
self.sliderScrollView.alwaysBounceVertical = NO; 
NSArray *imagesArray = self.sliderImagesArray; 
for (int i = 0; i < [imagesArray count]; i++){ 
      CGFloat xOrigin = i * self.imageSliderScrollView.frame.size.width; 
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin, 0, self.sliderScrollView.frame.size.width, self.sliderScrollView.frame.size.height)]; 
       imageView.userInteractionEnabled = YES; 
    NSString *imgStr = [serviceImgArray objectAtIndex:i]; 
    NSString *bikeStr = [NSString stringWithFormat:@"%@", imgStr]; 
    NSURL *imageURL = [NSURL URLWithString:[bikeStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 
    [imageView sd_setImageWithURL:imageURL 
         placeholderImage:[UIImage imageNamed:@"profilepic_bg"]]; 
[imageView setContentMode:UIViewContentModeScaleAspectFill]; 
       [self.sliderScrollView addSubview:imageView]; 
} 
// for adding autorotate scrolling 
    [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(autoStartSlide:) userInfo:nil repeats:YES]; 

self.sliderPageControll.numberOfPages = imagesArray.count; 
self.sliderPageControll.currentPage = 0; 
self.currentPageIndexString = [NSString stringWithFormat:@"%ld",(long)0]; 
[self.sliderScrollView setContentSize:CGSizeMake(self.sliderScrollView.frame.size.width * [imagesArray count], self.sliderScrollView.frame.size.height)]; 

if ([self.sliderPageControll respondsToSelector:@selector(setPageIndicatorTintColor:)]) { 
    self.sliderPageControll.currentPageIndicatorTintColor = [UIColor redColor]; 
    self.sliderPageControll.pageIndicatorTintColor = [UIColor whiteColor]; 
} 

CGRect frame = self.sliderScrollView.frame; 
frame.origin.x = frame.size.width * [[NSString stringWithFormat:@"%@",self.sliderIndexString] integerValue]; 
frame.origin.y = 0; 
[self.sliderScrollView scrollRectToVisible:frame animated:NO]; 
self.sliderPageControll.currentPage = [[NSString stringWithFormat:@"%@",self.sliderIndexString] integerValue]; 

創建後滾動視圖和分頁

@property (weak, nonatomic) IBOutlet UIScrollView *sliderScrollView; 
@property (weak, nonatomic) IBOutlet UIPageControl *sliderPageControll; 
@property (nonatomic,strong) NSArray *sliderImagesArray; 
@property (nonatomic,strong) NSString *sliderIndexString; 
@property (nonatomic,strong) NSString *currentPageIndexString; 

網點實現你的自動旋轉方法。

- (void)autoStartSlide:(id)sender { 
if(pagger.numberOfPages > pagger.currentPage+1) { 
    [UIView animateWithDuration:0.5 animations:^{ 
     slider.contentOffset = CGPointMake(slider.contentOffset.x + slider.frame.size.width, 0); 
    } completion:^(BOOL finished) { 

    }]; 
} 
else { 
    slider.contentOffset = CGPointMake(slider.contentOffset.x - slider.frame.size.width, 0); 
    [UIView animateWithDuration:0.5 animations:^{ 
     slider.contentOffset = CGPointMake(slider.contentOffset.x + slider.frame.size.width, 0); 
    } completion:^(BOOL finished) { 
     slider.contentOffset = CGPointMake(0, 0) ; 
    }]; 
} 
}