ios UIScrollView UIPageControl
一、UIScrollView
1.contentSize:UIScrollView可滚动的范围
[self.scroll setContentSize:CGSizeMake((KNumberOfPages + 2) * imageWidth, imageHeight)];
2.contentOffset:UIScrollView原点在contentSize上的位置
self.scroll.contentOffset = CGPointMake(imageWidth, 0);
3.contentInset:UIScrollView四周的扩展范围
4.PagingEnabled:是否有分页效果
[self.scroll setPagingEnabled:YES];
5.scrollEnabled：是否有滚动效果
[self.scroll setScrollEnabled:YES];
5.showsHorizontalScrollIndicator:是否显示水平滚动条
[self.scroll setShowsHorizontalScrollIndicator:YES];
6.bounces：是否有弹簧效果
[self.scroll setBounces:NO];
7.缩放：1.设置代理<UIScrollViewDelegate>
2.设置最大、最小缩放比例
self.myScrollerView.minimumZoomScale = 0.5; self.myScrollerView.maximumZoomScale = 2;
3.实现缩放代理方法，指定缩放的子视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{}
二、UIPageControl
注：一定要用initWithFrame初始化，不然不能换页
1.numberOfPages设置页数
[self.pageControl setNumberOfPages:KNumberOfPages];
2.currentPage设置当前页
[self.pageControl setCurrentPage:0];
3.pageIndicatorTintColor设置普通页指示器的颜色
[self.pageControl setPageIndicatorTintColor:[UIColor blackColor]];
4.currentPageIndicatorTintColor设置当前页指示器的颜色
小例子：实现5张图片的循环滚动
#define KNumberOfPages 5
@interface ViewController ()
@property (nonatomic, strong) UIScrollView *scroll;
@property (nonatomic, strong) NSMutableArray *imageArray;
@property (nonatomic, strong) UIPageControl *pageControl;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.imageArray = [NSMutableArray array];
CGFloat imageWidth = self.view.frame.size.width;
CGFloat imageHeight = self.view.frame.size.height;
self.scroll = [[UIScrollView alloc] initWithFrame:self.view.bounds];
[self.scroll setPagingEnabled:YES];
[self.scroll setBounces:NO];
[self.scroll setShowsHorizontalScrollIndicator:YES];
[self.scroll setContentSize:CGSizeMake((KNumberOfPages + 2) * imageWidth, imageHeight)];
[self.imageArray addObject:[UIImage imageNamed:@"5.jpg"]];
for (NSInteger i = 0; i < KNumberOfPages; i++) {
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg", i + 1]];
[self.imageArray addObject:image];
}
[self.imageArray addObject:[UIImage imageNamed:@"1.jpg"]];
NSLog(@"%@", self.imageArray);
for (NSInteger i = 0; i < KNumberOfPages + 2; i++) {
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(i * imageWidth, 0, imageWidth, imageHeight)];
imageView.image = self.imageArray[i];
[self.scroll addSubview:imageView];
}
self.scroll.contentOffset = CGPointMake(imageWidth, 0);
self.scroll.delegate = self;
[self.view addSubview:self.scroll];
self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 400, 320, 440)];//不这样初始化就无法点击
[self.pageControl setCenter:CGPointMake(160, 420)];
[self.pageControl setNumberOfPages:KNumberOfPages];
[self.pageControl setCurrentPage:0];
[self.pageControl setPageIndicatorTintColor:[UIColor blackColor]];
[self.pageControl addTarget:self action:@selector(pageDidClicked) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:self.pageControl];
}
- (void)pageDidClicked{
[self.scroll setContentOffset:CGPointMake((self.pageControl.currentPage + 1) * 320, 0) animated:YES];
}
//结束减速
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
if (self.scroll.contentOffset.x == 0) {
[self.scroll setContentOffset:CGPointMake(KNumberOfPages * 320, 0)];
}else if (self.scroll.contentOffset.x == (KNumberOfPages + 1) * 320){
[self.scroll setContentOffset:CGPointMake(320, 0)];
}
[UIView animateWithDuration:0.5 animations:^{
NSInteger number = self.scroll.contentOffset.x / 320;
self.pageControl.currentPage = number - 1;
}];
}
@end