//

//  ViewController.m

//  UIScrollVIew

#import "ViewController.h"

@interface ViewController ()<UIScrollViewDelegate>

@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;//已经设置大小是300*200

@property (weak, nonatomic) IBOutlet UIScrollView *scrollView1;

@property (weak, nonatomic) IBOutlet UIScrollView *scrollView2;

@end

@implementation ViewController

- (void)viewDidLoad {//控制器类加载完毕后

    [super viewDidLoad];

    //1、

    UIView *redView = [[UIView alloc]init];

    redView.backgroundColor = [UIColor redColor];

    redView.frame = CGRectMake(, , , );

    [self.scrollView addSubview:redView];

    self.scrollView.clipsToBounds = YES;

    //设置内容尺寸，水平不能滚动，垂直滚动10，

    self.scrollView.contentSize = CGSizeMake(, );

    //self.scrollView.scrollEnabled = NO; 不可以滚动

    //是否能够跟用户交互

    self.scrollView.userInteractionEnabled = YES;

    [self.scrollView.subviews.firstObject removeFromSuperview];//移除

    NSLog(@"%@",self.scrollView.subviews);

    /*   另外2个是滚动条，

     (

     "<UIView: 0x7fae0340c7d0; frame = (0 0; 50 50); layer = <CALayer: 0x600000036740>>",

     "<UIImageView: 0x7fae035126b0; frame = (294.667 190; 2.33333 7); alpha = 0; opaque = NO; autoresize = LM; userInteractionEnabled = NO; layer = <CALayer: 0x608000030f60>> - (null)",

     "<UIImageView: 0x7fae03512090; frame = (290 194.667; 7 2.33333); alpha = 0; opaque = NO; autoresize = TM; userInteractionEnabled = NO; layer = <CALayer: 0x608000030da0>> - (null)"

     )

     */

    //2、加载大图片

    UIImageView* image = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@""]];//大图片

    self.scrollView1.contentSize = CGSizeMake(image.frame.size.width, image.frame.size.height);

    self.scrollView1.bounces = YES;//弹簧效果

    self.scrollView1.alwaysBounceVertical = YES;//没有设置contentSize的时候，不能滚动，但是有时候网络加载的时候，没有数据，需要下拉刷新来加载数据，就用这个，

    self.scrollView1.alwaysBounceHorizontal = YES;

    self.scrollView1.showsVerticalScrollIndicator = YES;//是否显示滚动条

    [self.scrollView1 addSubview:image];

    self.scrollView1.contentInset = UIEdgeInsetsMake(, , , );//内边距

    //self.scrollView1.contentOffset = CGPointMake(700, 700);//设置偏移

    NSLog(@"%f",self.scrollView1.contentOffset.x);//获取滚动的偏移量

    //3、下拉刷新，显示菊花。

    UIActivityIndicatorView *iv = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

    iv.center = CGPointMake(, -);

    [iv startAnimating];

    self.scrollView2.backgroundColor = [UIColor yellowColor];

    self.scrollView2.alwaysBounceVertical = YES;//没有设置contentSize不能滚动，为了下载加载并显示菊花。（不能滚动，只是有弹簧效果）

    self.scrollView2.alwaysBounceHorizontal = NO;

    [self.scrollView2 addSubview:iv];

    //代理

    UIScrollView *s = [[UIScrollView alloc]init];

    s.backgroundColor = [UIColor redColor];

    s.frame = CGRectMake(, , , );

    [self.view addSubview:s];

    UIImage * i = [UIImage imageNamed:@"car"];

    UIImageView* imagev = [[UIImageView alloc]initWithImage:i];

    [s addSubview:imagev];

    s.contentSize = i.size;

    s.delegate = self;//代理，@property(nullable,nonatomic,weak) id<UIScrollViewDelegate>        delegate; 任何类型但是必须遵守UIScrollViewDelegate协议，在控制器加上遵守协议，@interface ViewController ()<UIScrollViewDelegate>，协议不写在.h文件中，因为.h文件暴露在外面给别人看的。

}

//点击控制器view的空白处调用

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event

{

    //self.scrollView1.contentOffset.y = 0;//不能直接修改oc对象的结构体变量的成员属性

    //点击回到顶部,并且添加动画

    [UIView animateWithDuration:2.0 animations:^{

        CGPoint cp = self.scrollView1.contentOffset;

        cp.y = ;

        self.scrollView1.contentOffset = cp;

    }];

    //点击回到左边

    [self.scrollView1 setContentOffset:CGPointMake(, self.scrollView1.contentOffset.y) animated:YES];

    NSLog(@"dddd");

}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView //区域正在滚动时候调用

{

}

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView //开始滚动时候调用

{

}

-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset//即将停止拖拽时候调用

{

}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView//减速完毕调用

{

}

@end