一、基本知识
#define WIDTH[[UIScreen mainScreen]bounds].size.width
#define HEIGHT[[UIScreen mainScreen]bounds].size.height
@interface ViewController ()<UIScrollViewDelegate>
scroll.contentSize = CGSizeMake((WIDTH-20)*10, HEIGHT+30);;//设置滚动范围，如果想要左右滑动，则必须保证此宽大于scroll的frame对应的宽，如果想要上下滑动必须保证此高大于scroll的frame对应的高
//scroll.scrollEnabled = YES;//是否允许滚动
scroll.bounces = YES;//是否有弹簧效果
//scroll.contentOffset =CGPointMake(40, 80);//设置scrollview滚动到某个位置
NSLog(@"%@",NSStringFromCGPoint(scroll.contentOffset));//获取scrollview当前滚动的位置
scroll.pagingEnabled = YES;//是否允许整页滚动，如果想要左右整页滑动，要保证contentsize的宽是scrollview frame宽的整数倍，如果要上下整页滑动，要保证contentsize 的高是frame高的整数倍，当下一页露出范围小于整页的一半时，滚回到当前页，当超出一半时，滚动到下一页
//scroll.showsHorizontalScrollIndicator = NO;//是否显示水平滚动条
//scroll.showsVerticalScrollIndicator = NO;//是否显示垂直滚动条
//scroll.scrollsToTop = YES;//点状态栏时，是否允许scorllView滚动到顶部
//scroll.zooming = YES;//是否允许缩放
label.backgroundColor = [UIColor redColor];
[scroll addSubview:label];
for (int i=1; i<4; i++) {
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i]];
// float w = image.size.width;
// float h =image.size.height;
UIImageView *imageview = [[UIImageView alloc]initWithImage:image];
imageview.frame = CGRectMake(30+i*375, 60, 300, 550);
[scroll addSubview:imageview];
@interface ViewController ()<UIScrollViewDelegate>
{
UISegmentedControl *segment;
UIScrollView *scrollView;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10, 30, 300, 400)];
scrollView.backgroundColor = [UIColor whiteColor];
scrollView.contentSize = CGSizeMake(900, 400);
scrollView.delegate = self;
scrollView.pagingEnabled = YES;
scrollView.scrollEnabled = NO;
[self.view addSubview:scrollView];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 400)];
view.backgroundColor = [UIColor grayColor];
[scrollView addSubview:view];
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(300, 0, 300, 400)];
view1.backgroundColor = [UIColor brownColor];
[scrollView addSubview:view1];
UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(600, 0, 300, 400)];
view2.backgroundColor = [UIColor purpleColor];
[scrollView addSubview:view2];
segment = [[UISegmentedControl alloc] initWithItems:@[@"1",@"2",@"3"]];
segment.frame = CGRectMake(10, 450,200, 40);
segment.selectedSegmentIndex = 0;
[segment addTarget:self action:@selector(segmentChange) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:segment];
}
-(void)segmentChange{
CGPoint p = {segment.selectedSegmentIndex*300,0};
[scrollView setContentOffset:p animated:YES];
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
// NSLog(@"滑动时调用");
}
-(void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{
//点击状态栏调用（scrolltotop = yes）
// NSLog(@"到顶了");
}
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
//手指放到scrollview上开始滑动时调用
// NSLog(@"调用");
}
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
//停止拖拽
// NSLog(@"--->停止");
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
//停止减速--scrollview不动了
// NSLog(@"不动了");
CGPoint p = scrollView.contentOffset;
float w = p.x;
int index = w/scrollView.frame.size.width;
NSLog(@"当前：%d页",index);
segment.selectedSegmentIndex = index;